Updated on 2021/11/22

写真a

 
NISHIZAWA Atsushi J.
 
Organization
Institute for Advanced Research Designated lecturer
Title
Designated lecturer
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Degree 1

  1. Science ( 2008.3   Nagoya University ) 

Research Interests 8

  1. Machine Learning

  2. Astrophysics

  3. Astronomy

  4. Observational Cosmology

  5. cluster of galaxies

  6. observational cosmology

  7. photometric redshift

  8. machine learning

Research Areas 2

  1. Natural Science / Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics  / dark matter

  2. Natural Science / Astronomy  / Observational cosmology

Research History 7

  1. Nagoya University   Institute for Advanced Research   Designated lecturer

    2013.5

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    Country:Japan

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  2. Postdoc fellow at Kavli Institute for the physics and mathematics of the Universe, The University of Tokyo

    2010.9 - 2014.4

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    Country:Japan

  3. The University of Tokyo   Kavli IPMU   Researcher

    2010.9 - 2013.4

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  4. Postdoc fellow at the Department of Astronomy, Tohoku University

    2009.4 - 2010.8

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    Country:Japan

  5. Tohoku University   Department of Science, Division of Astronomy   Researcher

    2009.4 - 2010.8

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    Country:Japan

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  6. Research Assistant at National Astronomical Observatory Japan

    2008.4 - 2009.3

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    Country:Japan

  7. National Astronomical Observatory of Japan   Astronomy Data Center   Post doctoral researcher

    2008.4 - 2009.3

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    Country:Japan

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Education 1

  1. Nagoya University   Graduate School, Division of Natural Science   Physics and Astrophysics

    - 2008.3

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    Country: Japan

Professional Memberships 4

  1. Physics Society of Japan

    2020.4

  2. 理論天体学宇宙物理学懇談会   会員

    2006.4

  3. Astronomical Society Japan

    2005.4

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  4. 理論天文学宇宙物理学懇談会

    2005.4

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Committee Memberships 1

  1. 日本天文学会   天文月報編集委員  

    2021.4   

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    Committee type:Academic society

Awards 1

  1. PASJ Excellent Paper Award

    2021.3   Astronomical Society of Japan   Cosmology from cosmic shear power spectra with Subaru Hyper Suprime Suprime-Cam first-year data

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    Award type:Honored in official journal of a scientific society, scientific journal  Country:Japan

 

Papers 74

  1. The Atacama Cosmology Telescope: A Catalog of >4000 Sunyaev-Zel'dovich Galaxy Clusters

    Hilton M., Sifon C., Naess S., Madhavacheril M., Oguri M., Rozo E., Rykoff E., Abbott T. M. C., Adhikari S., Aguena M., Aiola S., Allam S., Amodeo S., Amon A., Annis J., Ansarinejad B., Aros-Bunster C., Austermann J. E., Avila S., Bacon D., Battaglia N., Beall J. A., Becker D. T., Bernstein G. M., Bertin E., Bhandarkar T., Bhargava S., Bond J. R., Brooks D., Burke D. L., Calabrese E., Carrasco Kind M., Carretero J., Choi S. K., Choi A., Conselice C., Costa L. N. da, Costanzi M., Crichton D., Crowley K. T., Dunner R., Denison E. V., Devlin M. J., Dicker S. R., Diehl H. T., Dietrich J. P., Doel P., Duff S. M., Duivenvoorden A. J., Dunkley J., Everett S., Ferraro S., Ferrero I., Ferte A., Flaugher B., Frieman J., Gallardo P. A., Garcia-Bellido J., Gaztanaga E., Gerdes D. W., Giles P., Golec J. E., Gralla M. B., Grandis S., Gruen D., Gruendl R. A., Gschwend J., Gutierrez G., Han D., Hartley W. G., Hasselfield M., Hill J. C., Hilton G. C., Hincks A. D., Hinton S. R., Ho S-P. P., Honscheid K., Hoyle B., Hubmayr J., Huffenberger K. M., Hughes J. P., Jaelani A. T., Jain B., James D. J., Jeltema T., Kent S., Knowles K., Koopman B. J., Kuehn K., Lahav O., Lima M., Lin Y-T., Lokken M., Loubser S. I., MacCrann N., Maia M. A. G., Marriage T. A., Martin J., McMahon J., Melchior P., Menanteau F., Miquel R., Miyatake H., Moodley K., Morgan R., Mroczkowski T., Nati F., Newburgh L. B., Niemack M. D., Nishizawa A. J., Ogando R. L. C., Orlowski-Scherer J., Page L. A., Palmese A., Partridge B., Paz-Chinchon F., Phakathi P., Plazas A. A., Robertson N. C., Romer A. K., Rosell A. Carnero, Salatino M., Sanchez E., Schaan E., Schillaci A., Sehgal N., Serrano S., Shin T., Simon S. M., Smith M., Soares-Santos M., Spergel D. N., Staggs S. T., Storer E. R., Suchyta E., Swanson M. E. C., Tarle G., Thomas D., To C., Trac H., Ullom J. N., Vale L. R., Lanen J. Van, Vavagiakis E. M., Vicente J. De, Wilkinson R. D., Wollack E. J., Xu Z., Zhang Y.

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   Vol. 253 ( 1 )   2021.3

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    DOI: 10.3847/1538-4365/abd023

    Web of Science

  2. Active gas features in three HSC-SSP CAMIRA clusters revealed by high angular resolution analysis of MUSTANG-2 SZE and XXL X-ray observations

    Nobuhiro Okabe, Simon Dicker, Dominique Eckert, Tony Mroczkowski, Fabio Gastaldello, Yen-Ting Lin, Mark Devlin, Charles E. Romero, Mark Birkinshaw, Craig Sarazin, Cathy Horellou, Tetsu Kitayama, Keiichi Umetsu, Mauro Sereno, Brian S. Mason, John A. ZuHone, Ayaka Honda, Hiroki Akamatsu, I-Non Chiu, Kotaro Kohno, Kai-Yang Lin, Elinor Medezinski, Satoshi Miyazaki, Ikuyuki Mitsuishi, Atsushi J. Nishizawa, Masamune Oguri, Naomi Ota, Florian Pacaud, Marguerite Pierre, Jonathan Sievers, Vernesa Smolcic, Sara Stanchfield, Keigo Tanaka, Ryoichi Yamamoto, Chong Yang, Atsushi Yoshida

      Vol. 501 ( 2 ) page: 1701 - 1732   2021.2

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    We present results from simultaneous modeling of high angular resolution
    GBT/MUSTANG-2 90 GHz Sunyaev-Zel'dovich effect (SZE) measurements and XMM-XXL
    X-ray images of three rich galaxy clusters selected from the HSC-SSP Survey.
    The combination of high angular resolution SZE and X-ray imaging enables a
    spatially resolved multi-component analysis, which is crucial to understand
    complex distributions of cluster gas properties. The targeted clusters have
    similar optical richnesses and redshifts, but exhibit different dynamical
    states in their member galaxy distributions: a single-peaked cluster, a
    double-peaked cluster, and a cluster belonging to a supercluster. A large-scale
    residual pattern in both regular Compton-parameter $y$ and X-ray surface
    brightness distributions is found in the single-peaked cluster, indicating a
    sloshing mode. The double-peaked cluster shows an X-ray remnant cool core
    between two SZE peaks associated with galaxy concentrations. The temperatures
    of the two peaks reach $\sim20-30$ keV in contrast to the cool core component
    of $\sim2$ keV, indicating a violent merger. The main SZE signal for the
    supercluster is elongated along a direction perpendicular to the major axis of
    the X-ray core, suggesting a minor merger before core passage. The $S_X$ and
    $y$ distributions are thus perturbed at some level, regardless of the optical
    properties. We find that the integrated Compton $y$ parameter and the
    temperature for the major merger are boosted from those expected by the
    weak-lensing mass and those for the other two clusters show no significant
    deviations, which is consistent with predictions of numerical simulations.

    DOI: 10.1093/mnras/staa2330

    Web of Science

    arXiv

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    Other Link: http://arxiv.org/pdf/1911.09236v2

  3. The Subaru HSC Galaxy Clustering with Photometric Redshift. I. Dark Halo Masses versus Baryonic Properties of Galaxies at 0.3 <= z <= 1.4

    Ishikawa Shogo, Kashikawa Nobunari, Tanaka Masayuki, Coupon Jean, Leauthaud Alexie, Toshikawa Jun, Ichikawa Kohei, Oogi Taira, Uchiyama Hisakazu, Niino Yuu, Nishizawa Atsushi J.

    ASTROPHYSICAL JOURNAL   Vol. 904 ( 2 )   2020.12

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    DOI: 10.3847/1538-4357/abbd95

    Web of Science

  4. The Alcock Paczynski test with voids in 21 cm intensity field

    Endo Takao, Tashiro Hiroyuki, Nishizawa Atsushi J.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 499 ( 1 ) page: 587-596   2020.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/mnras/staa2822

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  5. The splashback radius of optically selected clusters with Subaru HSC Second Public Data Release Reviewed

    Ryoma Murata, Tomomi Sunayama, Masamune Oguri, Surhud More, Atsushi J. Nishizawa, Takahiro Nishimichi, Ken Osato

      Vol. 72 ( 4 )   2020.8

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    Recent constraints on the splashback radius around optically selected galaxy
    clusters from the redMaPPer cluster-finding algorithm in the literature have
    shown that the observed splashback radius is $\sim 20\%$ smaller than that
    predicted by N-body simulations. We present analyses on the splashback features
    around $\sim 3000$ optically selected galaxy clusters detected by the
    independent cluster-finding algorithm CAMIRA over a wide redshift range of
    $0.1<z_{\rm cl}<1.0$ from the second public data release of the Hyper
    Suprime-Cam (HSC) Subaru Strategic Program covering $\sim 427~{\rm deg}^2$ for
    the cluster catalog. We detect the splashback feature from the projected
    cross-correlation measurements between the clusters and photometric galaxies
    over the wide redshift range, including for high redshift clusters at
    $0.7<z_{\rm cl}<1.0$, thanks to deep HSC images. We find that constraints from
    red galaxy populations only are more precise than those without any color cut,
    leading to $1\sigma$ precisions of $\sim 15\%$ at $0.4<z_{\rm cl}<0.7$ and
    $0.7<z_{\rm cl}<1.0$. These constraints are more consistent with the model
    predictions ($\lesssim 1\sigma$) than their $20\%$ smaller values as suggested
    by the previous studies with the redMaPPer ($\sim 2\sigma$). We also
    investigate selection effects of the optical cluster-finding algorithms on the
    observed splashback features by creating mock galaxy catalogs from a halo
    occupation distribution model, and find that such effects to be sub-dominant
    for the CAMIRA cluster-finding algorithm. We also find that the redMaPPer-like
    cluster-finding algorithm induces a smaller inferred splashback radius in our
    mock catalog, especially at lower richness, which can well explain the smaller
    splashback radii in the literature. In contrast, these biases are significantly
    reduced when increasing its aperture size.

    DOI: 10.1093/pasj/psaa041

    Web of Science

    arXiv

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    Other Link: http://arxiv.org/pdf/2001.01160v2

  6. Weak lensing measurement of filamentary structure with the SDSS BOSS and Subaru Hyper Suprime-Cam data

    Kondo Hiroto, Miyatake Hironao, Shirasaki Masato, Sugiyama Naoshi, Nishizawa Atsushi J.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 495 ( 4 ) page: 3695-3704   2020.7

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    DOI: 10.1093/mnras/staa1390

    Web of Science

  7. A Study on the Baryon Acoustic Oscillation with Topological Data Analysis

    Kai T. Kono, Tsutomu T. Takeuchi, Suchetha Cooray, Atsushi J. Nishizawa, Koya Murakami

        2020.6

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    (abridged) The scale of the acoustic oscillation of baryons at the
    baryon-photon decoupling is imprinted on the spatial distribution of galaxies
    in the Universe, known as the baryon acoustic oscillation (BAO). The
    correlation functions and power spectrum are used as a central tool for the
    studies on the BAO analysis. In this work, we analyzed the spatial distribution
    of galaxies with a method from the topological data analysis (TDA), in order to
    detect and examine the BAO signal in the galaxy distribution. The TDA provides
    a method to treat various types of "holes" in point set data, by constructing
    the persistent homology (PH) group from the geometric structure of data points
    and handling the topological information of the dataset. We can obtain the
    information on the size, position, and statistical significance of the holes in
    the data. A particularly strong point of the persistent homology is that it can
    classify the holes by their spatial dimension, i.e., a 0-dim separation, 1-dim
    loop, 2-dim shell, etc. We first analyzed the simulation datasets with and
    without the baryon physics to examine the performance of the PH method. We
    found that the PH is indeed able to detect the BAO signal: simulation data with
    baryon physics present a prominent signal from the BAO, while data without
    baryon physics does not show this signal. Then, we applied the PH to a quasar
    sample at $z <1.0$ from extended Baryon Oscillation Spectroscopic Survey in
    Sloan Digital Sky Survey Data Release 14. We discovered a characteristic hole
    (a hollow shell) at a scaler $\sim150\ [{\rm Mpc}]$. This exactly corresponds
    to the BAO signature imprinted in the galaxy/quasar distribution. We performed
    this analysis on a small subsample of 2000 quasars. This clearly demonstrates
    that the PH analysis is very efficient in finding this type of topological
    structures even if the sampling is very sparse.

    arXiv

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    Other Link: http://arxiv.org/pdf/2006.02905v1

  8. Redshift Evolution of Green Valley Galaxies in Different Environments from the Hyper Suprime-Cam Survey

    Jian Hung-Yu, Lin Lihwai, Koyama Yusei, Tanaka Ichi, Umetsu Keiichi, Hsieh Bau-Ching, Higuchi Yuichi, Oguri Masamune, More Surhud, Komiyama Yutaka, Kodama Tadayuki, Nishizawa Atsushi J., Chang Yu-Yen

    ASTROPHYSICAL JOURNAL   Vol. 894 ( 2 )   2020.5

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    DOI: 10.3847/1538-4357/ab86a8

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  9. Photometric Redshifts for the Hyper Suprime-Cam Subaru Strategic Program Data Release 2 Reviewed

    Atsushi J. Nishizawa, Bau-Ching Hsieh, Masayuki Tanaka, Tadafumi Takata

        2020.2

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    We present a description of the second data release for the photometric
    redshift (photo-$z$) of the Subaru Strategic Program for the Hyper-Suprime Cam
    survey. Our photo-$z$ products for the entire area in the Data Release 2 are
    publicly available, and both our point estimate catalog products and full PDFs
    can be retrieved from the data release site,
    \url{https://hsc-release.mtk.nao.ac.jp/}.

    arXiv

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    Other Link: http://arxiv.org/pdf/2003.01511v2

  10. Weak-lensing Analysis of X-Ray-selected XXL Galaxy Groups and Clusters with Subaru HSC Data

    Umetsu Keiichi, Sereno Mauro, Lieu Maggie, Miyatake Hironao, Medezinski Elinor, Nishizawa Atsushi J., Giles Paul, Gastaldello Fabio, McCarthy Ian G., Kilbinger Martin, Birkinshaw Mark, Ettori Stefano, Okabe Nobuhiro, Chiu I-Non, Coupon Jean, Eckert Dominique, Fujita Yutaka, Higuchi Yuichi, Koulouridis Elias, Maughan Ben, Miyazaki Satoshi, Oguri Masamune, Pacaud Florian, Pierre Marguerite, Rapetti David, Smith Graham P.

    ASTROPHYSICAL JOURNAL   Vol. 890 ( 2 )   2020.2

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    DOI: 10.3847/1538-4357/ab6bca

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  11. The Alcock Paczynski test with 21cm intensity field Reviewed

    Takao Endo, Hiroyuki Tashiro, Atsushi J. Nishizawa

        2020.2

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    Feasibility of the Alcock Paczynski (AP) test by stacking voids in the 21cm
    line intensity field is presented. We analyze the Illstris-TNG simulation to
    obtain the 21cm signal map. We then randomly distribute particles depending on
    the 21cm intensity field to find voids by using publicly available code, VIDE.
    As in the galaxy clustering, the shape of the stacked void in the 21cm field is
    squashed along the line of sight due to the peculiar velocities in
    redshift-space, although it becomes spherical in real-space. The redshift-space
    distortion for the stacked void weakly depends on redshift and we show that the
    dependency can be well described by the linear prediction, with the amplitude
    of the offset being free parameters. We find that the AP test using the stacked
    voids in a 21cm intensity map is feasible and the parameter estimation on
    $\Omega_{\rm m}$ and $w$ is unbiased.

    arXiv

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    Other Link: http://arxiv.org/pdf/2002.00348v1

  12. Cosmological constraints from cosmic shear two-point correlation functions with HSC survey first-year data

    Hamana Takashi, Shirasaki Masato, Miyazaki Satoshi, Hikage Chiaki, Oguri Masamune, More Surhud, Armstrong Robert, Leauthaud Alexie, Mandelbaum Rachel, Miyatake Hironao, Nishizawa Atsushi J., Simet Melanie, Takada Masahiro, Aihara Hiroaki, Bosch James, Komiyama Yutaka, Lupton Robert, Murayama Hitoshi, Strauss Michael A., Tanaka Masayuki

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 72 ( 1 )   2020.2

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    DOI: 10.1093/pasj/psz138

    Web of Science

  13. Constraining dark matter annihilation with HSC Low Surface Brightness Galaxies Reviewed

    Daiki Hashimoto, Oscar Macias, Atsushi J. Nishizawa, Kohei Hayashi, Masahiro Takada, Masato Shirasaki, Shin'ichiro Ando

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 1 )   2020.1

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    Searches for dark matter annihilation signals have been carried out in a
    number of target regions such as the Galactic Center and Milky Way dwarf
    spheroidal galaxies (dSphs), among a few others. Here we propose low surface
    brightness galaxies (LSBGs) asnovel targets for the indirect detection of dark
    matter emission. In particular, LSBGs are known to have very large dark matter
    contents and be less contaminated by extragalactic gamma-ray sources (e.g.,
    blazars) compared to star forming galaxies. We report on an analysis that uses
    eight LSBGs (detected by Subaru Hyper Suprime-Cam survey data) with known
    redshifts to conduct a search for gamma-ray emission at the positions of these
    new objects in Fermi Large Area Telescope data. We found no excesses of
    gamma-ray emission and set constraints on the dark matter annihilation
    cross-section. We exclude (at the 95% C.L.) dark matter scenarios predicting a
    cross-section higher than 10^-23[cm^3/s] for dark matter particles of mass 10
    GeV self-annihilating in the b_b channel. Although this constraint is weaker
    than the ones reported in recent studies using other targets, we note that in
    the near future, the number of detections of new LSBGs will increase by a few
    orders of magnitude. We forecast that with the use of the full catalog of
    soon-to-be-detected LSBGs the constraint will reach cross-section sensitivities
    of ~ 3*10^-25 [cm^3/s] for dark matter particles with masses less than 10 GeV.

    DOI: 10.1088/1475-7516/2020/01/059

    Web of Science

    arXiv

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    Other Link: http://arxiv.org/pdf/1906.06701v2

  14. Density Fluctuation Reconstruction using KS test and D'Agostino's K-squared test Reviewed

    Kiichi Yoshida, Kiyotomo Ichiki, Atsushi J. Nishizawa

        2019.12

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    We propose a new non-parametric method to constrain the cosmological model
    through the growth factor of large-scale structure. To constrain the
    cosmological model from observations such as cosmic microwave background or
    large-scale structure, the power spectrum or correlation function have been
    used since they are well described by the linear perturbation theory or little
    correction is needed for the non-linearity; however, it is always important to
    find an alternative route to constrain cosmological models in order to avoid
    systematic effects due to the estimator and make the constraint more robust.Our
    density fluctuation reconstruction method constrains the cosmological model
    directly from time evolution of density fluctuation. We propose to apply
    Kolmogorov-Smirnov test and D'Agostino's K-squared test to the distribution
    function of density fluctuations, which are observed on a light cone. The
    density fluctuation recovers the Gaussian distribution only if we reconstruct
    the density fluctuation with correct linear growth factors. The method is
    verified by the use of Gaussian random field and N-body simulations. This
    method will open a new window both to separate the initial three dimensional
    density fluctuation and the growth factor of large scale structure.

    arXiv

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    Other Link: http://arxiv.org/pdf/1912.08384v1

  15. The Subaru HSC Galaxy Clustering with Photometric Redshift I: Dark Halo Masses Versus Baryonic Properties of Galaxies at 0.3<z<1.4 Reviewed

    Shogo Ishikawa, Nobunari Kashikawa, Masayuki Tanaka, Jean Coupon, Alexie Leauthaud, Jun Toshikawa, Kohei Icihkawa, Taira Oogi, Hiasakazu Uchiyama, Yuu Niino, Atsushi J. Nishizawa

        2019.12

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    We present the clustering properties of low-$z$ $(z\leq1.4)$ galaxies
    selected by the Hyper Suprime-Cam Subaru Strategic Program Wide layer over
    $145$ deg$^{2}$. The wide-field and multi-wavelength observation yields
    $5,064,770$ galaxies at $0.3\leq z\leq1.4$ with photometric redshifts and
    physical properties. This enables the accurate measurement of angular
    correlation functions and subsequent halo occupation distribution (HOD)
    analysis allows the connection between baryonic properties and dark halo
    properties. The fraction of less-massive satellite galaxies at $z\lesssim1$ is
    found to be almost constant at $\sim20\%$, but it gradually decreases beyond
    $M_{\star} \sim 10^{10.4}h^{-2}M_{\odot}$. However, the abundance of satellite
    galaxies at $z>1$ is quite small even for less-massive galaxies due to the
    rarity of massive centrals at high-$z$. This decreasing trend is connected to
    the small satellite fraction of Lyman break galaxies at $z>3$. The
    stellar-to-halo mass ratios at $0.3\leq z\leq1.4$ are almost consistent with
    the predictions obtained using the latest empirical model; however, we identify
    small excesses from the theoretical model at the massive end. The pivot halo
    mass is found to be unchanged at $10^{11.9-12.1}h^{-1}M_{\odot}$ at $0.3\leq
    z\leq1.4$, and we systematically show that $10^{12}h^{-1}M_{\odot}$ is a
    universal pivot halo mass up to $z\sim5$ that is derived using only the
    clustering/HOD analyses. Nevertheless, halo masses with peaked instantaneous
    baryon conversion efficiencies are much smaller than the pivot halo mass
    regardless of a redshift, and the most efficient stellar-mass assembly is
    thought to be in progress in $10^{11.0-11.5}h^{-1}M_{\odot}$ dark haloes.

    arXiv

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    Other Link: http://arxiv.org/pdf/1912.05668v1

  16. Second data release of the Hyper Suprime-Cam Subaru Strategic Program

    Aihara Hiroaki, AlSayyad Yusra, Ando Makoto, Armstrong Robert, Bosch James, Egami Eiichi, Furusawa Hisanori, Furusawa Junko, Goulding Andy, Harikane Yuichi, Hikage Chiaki, Ho Paul T. P., Hsieh Bau-Ching, Huang Song, Ikeda Hiroyuki, Imanishi Masatoshi, Ito Kei, Iwata Ikuru, Jaelani Anton T., Kakuma Ryota, Kawana Kojiro, Kikuta Satoshi, Kobayashi Umi, Koike Michitaro, Komiyama Yutaka, Li Xiangchong, Liang Yongming, Lin Yen-Ting, Luo Wentao, Lupton Robert, Lust Nate B., MacArthur Lauren A., Matsuoka Yoshiki, Mineo Sogo, Miyatake Hironao, Miyazaki Satoshi, More Surhud, Murata Ryoma, Namiki Shigeru V, Nishizawa Atsushi J., Oguri Masamune, Okabe Nobuhiro, Okamoto Sakurako, Okura Yuki, Ono Yoshiaki, Onodera Masato, Onoue Masafusa, Osato Ken, Ouchi Masami, Shibuya Takatoshi, Strauss Michael A., Sugiyama Naoshi, Suto Yasushi, Takada Masahiro, Takagi Yuhei, Takata Tadafumi, Takita Satoshi, Tanaka Masayuki, Terai Tsuyoshi, Toba Yoshiki, Uchiyama Hisakazu, Utsumi Yousuke, Wang Shiang-Yu, Wang Wenting, Yamada Yoshihiko

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 71 ( 6 )   2019.12

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    DOI: 10.1093/pasj/psz103

    Web of Science

  17. The CFHT large area U-band deep survey (CLAUDS)

    Sawicki Marcin, Arnouts Stephane, Huang Jiasheng, Coupon Jean, Golob Anneya, Gwyn Stephen, Foucaud Sebastien, Moutard Thibaud, Iwata Ikuru, Liu Chengze, Chen Lingjian, Desprez Guillaume, Harikane Yuichi, Ono Yoshiaki, Strauss Michael A., Tanaka Masayuki, Thibert Nathalie, Balogh Michael, Bundy Kevin, Chapman Scott, Gunn James E., Hsieh Bau-Ching, Ilbert Olivier, Jing Yipeng, Lefevre Olivier, Li Cheng, Matsuda Yuichi, Miyazaki Satoshi, Nagao Tohru, Nishizawa Atsushi J., Ouchi Masami, Shimasaku Kazuhiro, Silverman John, de la Torre Sylvain, Tresse Laurence, Wang Wei-Hao, Willott Chris J., Yamada Toru, Yang Xiaohu, Yee Howard K. C.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 489 ( 4 ) page: 5202-5217   2019.11

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    DOI: 10.1093/mnras/stz2522

    Web of Science

  18. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). X. Discovery of 35 Quasars and Luminous Galaxies at 5.7 <= z <= 7.0

    Matsuoka Yoshiki, Iwasawa Kazushi, Onoue Masafusa, Kashikawa Nobunari, Strauss Michael A., Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Koyama Shuhei, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Noboriguchi Akatoki, Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

    ASTROPHYSICAL JOURNAL   Vol. 883 ( 2 )   2019.10

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    DOI: 10.3847/1538-4357/ab3c60

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  19. The mass-richness relation of optically selected clusters from weak gravitational lensing and abundance with Subaru HSC first-year data

    Murata Ryoma, Oguri Masamune, Ishimichi Takahiro N., Takada Masahiro, Mandelbaum Rachel, More Surhud, Shirasaki Masato, Nishizawa Atsushi J., Osato Ken

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 71 ( 5 )   2019.10

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    DOI: 10.1093/pasj/psz092

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  20. Evidence for the Cross-correlation between Cosmic Microwave Background Polarization Lensing from POLARBEAR and Cosmic Shear from Subaru Hyper Suprime-Cam

    Toshiya Namikawa, Yuji Chinone, Hironao Miyatake, Masamune Oguri, Ryuichi Takahashi, Akito Kusaka, Nobuhiko Katayama, Shunsuke Adachi, Mario Aguilar, Hiroaki Aihara, Aamir Ali, Robert Armstrong, Kam Arnold, Carlo Baccigalupi, Darcy Barron, Dominic Beck, Shawn Beckman, Federico Bianchini, David Boettger, Julian Borrill, Kolen Cheung, Lance Corbett, Kevin T. Crowley, Hamza El Bouhargani, Tucker Elleflot, Josquin Errard, Giulio Fabbian, Chang Feng, Nicholas Galitzki, Neil Goeckner-Wald, John Groh, Takaho Hamada, Masaya Hasegawa, Masashi Hazumi, Charles Hill, Logan Howe, Oliver Jeong, Daisuke Kaneko, Brian Keating, Adrian T. Lee, David Leon, Eric Linder, Lindsay Ng Lowry, Aashrita Mangu, Frederick Matsuda, Yuto Minami, Satoshi Miyazaki, Hitoshi Murayama, Martin Navaroli, Haruki Nishino, Atsushi J. Nishizawa, Anh Thi Phuong Pham, Davide Poletti, Giuseppe Puglisi, Christian L. Reichardt, Blake D. Sherwin, Maximiliano Silva-Feaver, Praween Siritanasak, Joshua S. Speagle, Radek Stompor, Aritoki Suzuki, Philip J. Tait, Osamu Tajima, Masahiro Takada, Satoru Takakura, Sayuri Takatori, Daiki Tanabe, Masayuki Tanaka, Grant P. Teply, Calvin Tsai, Clara Verges, Ben Westbrook, Yuyang Zhou, The POLARBEAR Collaboration, the Subaru HSC SSP Collaboration

    ASTROPHYSICAL JOURNAL   Vol. 882 ( 1 )   2019.9

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    We present the first measurement of cross-correlation between the lensing
    potential, reconstructed from cosmic microwave background (CMB) {\it
    polarization} data, and the cosmic shear field from galaxy shapes. This
    measurement is made using data from the POLARBEAR CMB experiment and the Subaru
    Hyper Suprime-Cam (HSC) survey. By analyzing an 11~deg$^2$ overlapping region,
    we reject the null hypothesis at 3.5$\sigma$\ and constrain the amplitude of
    the {\bf cross-spectrum} to $\widehat{A}_{\rm lens}=1.70\pm 0.48$, where
    $\widehat{A}_{\rm lens}$ is the amplitude normalized with respect to the
    Planck~2018{} prediction, based on the flat $\Lambda$ cold dark matter
    cosmology. The first measurement of this {\bf cross-spectrum} without relying
    on CMB temperature measurements is possible due to the deep POLARBEAR map with
    a noise level of ${\sim}$6\,$\mu$K-arcmin, as well as the deep HSC data with a
    high galaxy number density of $n_g=23\,{\rm arcmin^{-2 } }$. We present a
    detailed study of the systematics budget to show that residual systematics in
    our results are negligibly small, which demonstrates the future potential of
    this cross-correlation technique.

    DOI: 10.3847/1538-4357/ab3424

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    arXiv

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    Other Link: http://arxiv.org/pdf/1904.02116v2

  21. Halo concentration, galaxy red fraction, and gas properties of optically defined merging clusters

    Okabe Nobuhiro, Oguri Masamune, Akamatsu Hiroki, Hamabata Akinari, Nishizawa Atsushi J., Medezinski Elinor, Koyama Yusei, Hayashi Masao, Okabe Taizo, Ueda Shutaro, Mitsuishi Ikuyuki, Ota Naomi

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 71 ( 4 )   2019.8

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    DOI: 10.1093/pasj/psz059

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  22. Effect of lensing magnification on type Ia supernova cosmology Reviewed

    Hinako Sakakibara, Atsushi J. Nishizawa, Masamune Oguri, Masayuki Tanaka, Bau-Ching Hsieh, Kenneth C. Wong

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 486 ( 3 ) page: 4365 - 4376   2019.7

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    Effect of gravitational magnification on the measurement of distance modulus
    of type Ia supernovae is presented. We investigate a correlation between
    magnification and Hubble residual to explore how the magnification affects the
    estimation of cosmological parameters. We estimate magnification of type Ia
    supernovae in two distinct methods: one is based on convergence mass
    reconstruction under the weak lensing limit and the other is based on the
    direct measurement from galaxies distribution. Both magnification measurements
    are measured from Subaru Hyper Suprime-Cam survey catalogue. For both
    measurements, we find no significant correlation between Hubble residual and
    magnification. Furthermore, we correct for the apparent supernovae fluxes
    obtained by Supernova Legacy Survey 3-year sample using direct measurement of
    the magnification. We find $\Omega_{\rm m0} = 0.287 ^{+0.104} _{-0.085}$ and $w
    = -1.161 ^{+0.595}_{-0.358}$ for supernovae samples corrected for lensing
    magnification when we use photometric redshift catalogue of Mizuki, while
    $\Omega_{\rm m0} = 0.253 ^{+0.113} _{-0.087}$ and $w = -1.078 ^{+0.498}
    _{-0.297}$ for DEmP photo-z catalogue. Therefore, we conclude that the effect
    of magnification on the supernova cosmology is negligibly small for the current
    surveys; however, it has to be considered for the future supernova survey like
    LSST.

    DOI: 10.1093/mnras/stz1117

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    arXiv

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    Other Link: http://arxiv.org/pdf/1901.10129v1

  23. Detectability of CMB Weak Lensing and HI Cross Correlation and constraints on cosmological parameters Reviewed

    Shoichiro Tanaka, Shintaro Yoshiura, Kenji Kubota, Keitaro Takahashi, Atsushi J. Nishizawa, Naoshi Sugiyama

        2019.4

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    Neutral hydrogen (H$_{\rm I}$) intensity mapping is capable of measuring
    redshift evolution of H$_{\rm I}$ density parameter $\Omega_{\rm H_{\rm I } }$,
    which is an important parameter to understand structure formation in the
    post-reionization epoch. Future H$_{\rm I}$ observation with Square Kilometre
    Array (SKA) can significantly improve constraints on the parameter. However,
    the observation of H$_{\rm I}$ suffers from the contamination from extremely
    bright foreground emissions, and it is necessary to consider a signal
    validation method complementary to the measurement of H$_{\rm I}$ auto power
    spectrum. In this work, we propose to take a cross correlation between a
    21cm-line intensity map and a convergence map reconstructed from observation of
    the cosmic microwave background by Planck and estimate expected ideal
    constraints on cosmological parametersby ignoring the foreground contamination.
    We find that the SKA1-mid operated in single-dish mode has a sufficient
    capability to detect the cross correlation on the large scales. Further, by
    Fisher analysis assuming a constant linear bias of H$_{\rm I}$, $b$, and
    SKA1-mid observation of 1,000 hours for each of Band 1 and 2, we show that
    $\Omega_{\rm H_{\rm I } } b$ can be constrained with a precision of $6-13\%$ at a
    wide range of redshifts of $0.0<z<2.0$, if we fix other cosmological parameters
    (density parameter of cold dark matter, $\Omega_{\rm c} h^{2}$, spectral index
    of primordial fluctuations, $n_s$, and Hubble constant, $H_0$) using values
    from the Planck observations. On the other hand, small-scale measurements with
    interferometer mode of SKA1-mid will not have a significant impact on
    constraining the parameters with 1,000 hours of observation time for each of
    Band 1 and 2, due to the limited resolution of the CMB lensing of Planck.

    arXiv

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    Other Link: http://arxiv.org/pdf/1904.10363v2

  24. Weak-lensing Mass Calibration of ACTPol Sunyaev-Zel'dovich Clusters with the Hyper Suprime-Cam Survey

    Miyatake Hironao, Battaglia Nicholas, Hilton Matt, Medezinski Elinor, Nishizawa Atsushi J., More Surhud, Aiola Simone, Bahcall Neta, Bond J. Richard, Calabrese Erminia, Choi Steve K., Devlin Mark J., Dunkley Joanna, Dunner Rolando, Fuzia Brittany, Gallardo Patricio, Gralla Megan, Hasselfield Matthew, Halpern Mark, Hikage Chiaki, Hill J. Colin, Hincks Adam D., Hlozek Renee, Huffenberger Kevin, Hughes John P., Koopman Brian, Kosowsky Arthur, Louis Thibaut, Madhavacheril Mathew S., McMahon Jeff, Mandelbaum Rachel, Marriage Tobias A., Maurin Loic, Miyazaki Satoshi, Moodley Kavilan, Murata Ryoma, Naess Sigurd, Newburgh Laura, Niemack Michael D., Nishimichi Takahiro, Okabe Nobuhiro, Oguri Masamune, Osato Ken, Page Lyman, Partridges Bruce, Robertson Naomi, Sehgal Neelima, Sherwin Blake, Shirasaki Masato, Sievers Jonathan, Sifon Cristobal, Simon Sara, Spergel David N., Staggs Suzanne T., Stein George, Takada Masahiro, Trac Hy, Umetsu Keiichi, van Engelenl Alex, Wollack Edward J.

    ASTROPHYSICAL JOURNAL   Vol. 875 ( 1 )   2019.4

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    DOI: 10.3847/1538-4357/ab0af0

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  25. Redshift space distortion of 21 cm line at 1 < z < 5 with cosmological hydrodynamic simulations

    Ando Rika, Nishizawa Atsushi J., Hasegawa Kenji, Shimizu Ikkoh, Nagamine Kentaro

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 484 ( 4 ) page: 5389-5399   2019.4

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    DOI: 10.1093/mnras/stz319

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  26. Measurement of redshift-dependent cross-correlation of HSC clusters and Fermi gamma-rays

    Hashimoto Daiki, Nishizawa Atsushi J., Shirasaki Masato, Macias Oscar, Horiuchi Shunsaku, Tashiro Hiroyuki, Oguri Masamune

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 484 ( 4 ) page: 5256-5266   2019.4

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    DOI: 10.1093/mnras/stz321

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  27. Cosmology from cosmic shear power spectra with Subaru Hyper Suprime-Cam first-year data

    Chiaki Hikage, Masamune Oguri, Takashi Hamana, Surhud More, Rachel Mandelbaum, Masahiro Takada, Fabian Köhlinger, Hironao Miyatake, Atsushi J. Nishizawa, Hiroaki Aihara, Robert Armstrong, James Bosch, Jean Coupon, Anne Ducout, Paul Ho, Bau-Ching Hsieh, Yutaka Komiyama, François Lanusse, Alexie Leauthaud, Robert H. Lupton, Elinor Medezinski, Sogo Mineo, Shoken Miyama, Satoshi Miyazaki, Ryoma Murata, Hitoshi Murayama, Masato Shirasaki, Cristóbal Sifón, Melanie Simet, Joshua Speagle, David N. Spergel, Michael A. Strauss, Naoshi Sugiyama, Masayuki Tanaka, Yousuke Utsumi, Shiang-Yu Wang, Yoshihiko Yamada

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 71 ( 2 )   2019.4

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    We measure cosmic weak lensing shear power spectra with the Subaru Hyper
    Suprime-Cam (HSC) survey first-year shear catalog covering 137deg$^2$ of the
    sky. Thanks to the high effective galaxy number density of $\sim$17
    arcmin$^{-2}$ even after conservative cuts such as magnitude cut of $i<24.5$
    and photometric redshift cut of $0.3\leq z \leq 1.5$, we obtain a high
    significance measurement of the cosmic shear power spectra in 4 tomographic
    redshift bins, achieving a total signal-to-noise ratio of 16 in the multipole
    range $300 \leq \ell \leq 1900$. We carefully account for various uncertainties
    in our analysis including the intrinsic alignment of galaxies, scatters and
    biases in photometric redshifts, residual uncertainties in the shear
    measurement, and modeling of the matter power spectrum. The accuracy of our
    power spectrum measurement method as well as our analytic model of the
    covariance matrix are tested against realistic mock shear catalogs. For a flat
    $\Lambda$ cold dark matter ($\Lambda$CDM) model, we find $S_8\equiv
    \sigma_8(\Omega_{\rm m}/0.3)^\alpha=0.800^{+0.029}_{-0.028}$ for $\alpha=0.45$
    ($S_8=0.780^{+0.030}_{-0.033}$ for $\alpha=0.5$) from our HSC tomographic
    cosmic shear analysis alone. In comparison with Planck cosmic microwave
    background constraints, our results prefer slightly lower values of $S_8$,
    although metrics such as the Bayesian evidence ratio test do not show
    significant evidence for discordance between these results. We study the effect
    of possible additional systematic errors that are unaccounted in our fiducial
    cosmic shear analysis, and find that they can shift the best-fit values of
    $S_8$ by up to $\sim 0.6\sigma$ in both directions. The full HSC survey data
    will contain several times more area, and will lead to significantly improved
    cosmological constraints.

    DOI: 10.1093/pasj/psz010

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    arXiv

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    Other Link: http://arxiv.org/pdf/1809.09148v2

  28. Weak-lensing Mass Calibration of ACTPol Sunyaev–Zel'dovich Clusters with the Hyper Suprime-Cam Survey

    Miyatake Hironao, Battaglia Nicholas, Hilton Matt, Medezinski Elinor, Nishizawa Atsushi J., More Surhud, Aiola Simone, Bahcall Neta, Bond J. Richard, Calabrese Erminia, Choi Steve K., Devlin Mark J., Dunkley Joanna, Dunner Rolando, Fuzia Brittany, Gallardo Patricio, Gralla Megan, Hasselfield Matthew, Halpern Mark, Hikage Chiaki, Hill J. Colin, Hincks Adam D., Hložek Renée, Huffenberger Kevin, Hughes John P., Koopman Brian, Kosowsky Arthur, Louis Thibaut, Madhavacheril Mathew S., McMahon Jeff, Mandelbaum Rachel, Marriage Tobias A., Maurin Loïc, Miyazaki Satoshi, Moodley Kavilan, Murata Ryoma, Naess Sigurd, Newburgh Laura, Niemack Michael D., Nishimichi Takahiro, Okabe Nobuhiro, Oguri Masamune, Osato Ken, Page Lyman, Partridge Bruce, Robertson Naomi, Sehgal Neelima, Sherwin Blake, Shirasaki Masato, Sievers Jonathan, Sifón Cristóbal, Simon Sara, Spergel David N., Staggs Suzanne T., Stein George, Takada Masahiro, Trac Hy, Umetsu Keiichi, Engelen Alex van, Wollack Edward J.

      Vol. 875 ( 1 ) page: .   2019.4

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    We present weak-lensing measurements using the first-year data from the Hyper Suprime-Cam Strategic Survey Program on the Subaru telescope for eight galaxy clusters selected through their thermal Sunyaev–Zel'dovich (SZ) signal measured at 148 GHz with the Atacama Cosmology Telescope Polarimeter experiment. The overlap between the two surveys in this work is 33.8 square degrees, before masking bright stars. The signal-to-noise ratio of individual cluster lensing measurements ranges from 2.2 to 8.7, with a total of 11.1 for the stacked cluster weak-lensing signal. We fit for an average weak-lensing mass distribution using three different profiles, a Navarro–Frenk–White profile, a dark-matter-only emulated profile, and a full cosmological hydrodynamic emulated profile. We interpret the differences among the masses inferred by these models as a systematic error of 10%, which is currently smaller than the statistical error. We obtain the ratio of the SZ-estimated mass to the lensing-estimated mass (the so-called hydrostatic mass bias 1−b) of ${0.74}_{-0.12}^{+0.13}$, which is comparable to previous SZ-selected clusters from the Atacama Cosmology Telescope and from the Planck Satellite. We conclude with a discussion of the implications for cosmological parameters inferred from cluster abundances compared to cosmic microwave background primary anisotropy measurements.

    CiNii Article

  29. Discovery of the First Low-Luminosity Quasar at z > 7

    Yoshiki Matsuoka, Masafusa Onoue, Nobunari Kashikawa, Michael A. Strauss, Kazushi Iwasawa, Chien-Hsiu Lee, Masatoshi Imanishi, Tohru Nagao, Masayuki Akiyama, Naoko Asami, James Bosch, Hisanori Furusawa, Tomotsugu Goto, James E. Gunn, Yuichi Harikane, Hiroyuki Ikeda, Takuma Izumi, Toshihiro Kawaguchi, Nanako Kato, Satoshi Kikuta, Kotaro Kohno, Yutaka Komiyama, Shuhei Koyama, Robert H. Lupton, Takeo Minezaki, Satoshi Miyazaki, Hitoshi Murayama, Mana Niida, Atsushi J. Nishizawa, Akatoki Noboriguchi, Masamune Oguri, Yoshiaki Ono, Masami Ouchi, Paul A. Price, Hiroaki Sameshima, Andreas Schulze, Hikari Shirakata, John D. Silverman, Naoshi Sugiyama, Philip J. Tait, Masahiro Takada, Tadafumi Takata, Masayuki Tanaka, Ji-Jia Tang, Yoshiki Toba, Yousuke Utsumi, Shiang-Yu Wang, Takuji Yamashita

    ASTROPHYSICAL JOURNAL LETTERS   Vol. 872 ( 1 )   2019.2

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    We report the discovery of a quasar at z = 7.07, which was selected from the
    deep multi-band imaging data collected by the Hyper Suprime-Cam (HSC) Subaru
    Strategic Program survey. This quasar, HSC J124353.93+010038.5, has an order of
    magnitude lower luminosity than do the other known quasars at z > 7. The
    rest-frame ultraviolet absolute magnitude is M1450 = -24.13 +/- 0.08 mag and
    the bolometric luminosity is Lbol = (1.4 +/- 0.1) x 10^{46} erg/s. Its spectrum
    in the optical to near-infrared shows strong emission lines, and shows evidence
    for a fast gas outflow, as the C IV line is blueshifted and there is indication
    of broad absorption lines. The Mg II-based black hole mass is Mbh = (3.3 +/-
    2.0) x 10^8 Msun, thus indicating a moderate mass accretion rate with an
    Eddington ratio 0.34 +/- 0.20. It is the first z > 7 quasar with sub-Eddington
    accretion, besides being the third most distant quasar, known to date. The
    luminosity and black hole mass are comparable to, or even lower than, those
    measured for the majority of low-z quasars discovered by the Sloan Digital Sky
    Survey, and thus this quasar likely represents a z > 7 counterpart to quasars
    commonly observed in the low-z universe.

    DOI: 10.3847/2041-8213/ab0216

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    Other Link: http://arxiv.org/pdf/1901.10487v1

  30. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z=6

    Matsuoka Yoshiki, Strauss Michael A., Kashikawa Nobunari, Onoue Masafusa, Iwasawa Kazushi, Tang Ji-Jia, Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Noboriguchi Akatoki, Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

    ASTROPHYSICAL JOURNAL   Vol. 869 ( 2 )   2018.12

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    DOI: 10.3847/1538-4357/aaee7a

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  31. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). V. Quasar Luminosity Function and Contribution to Cosmic Reionization at z = 6

    Matsuoka Yoshiki, Strauss Michael A., Kashikawa Nobunari, Onoue Masafusa, Iwasawa Kazushi, Tang Ji-Jia, Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Noboriguchi Akatoki, Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

    The Astrophysical Journal   Vol. 869 ( 2 ) page: .   2018.12

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  32. Intrinsic galaxy alignment from angular dependent primordial non-Gaussianity

    Kogai Kazuhiro, Matsubara Takahiko, Nishizawa Atsushi J., Urakawa Yuko

    Journal of Cosmology and Astroparticle Physics   Vol. 2018 ( 8 ) page: 14-14   2018.8

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  33. Effect of Dark Energy Perturbation on Cosmic Voids Formation Reviewed

    Takao Endo, Atsushi J. Nishizawa, Kiyotomo Ichiki

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 478 ( 4 ) page: 5230 - 5239   2018.8

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    In this paper, we present the effects of dark energy perturbation on the
    formation and abundance of cosmic voids. We consider dark energy to be a fluid
    with a negative pressure characterised by a constant equation of state w and
    speed of sound $c^2_s$. By solving fluid equations for two components, namely,
    dark matter and dark energy fluids, we quantify the effects of dark energy
    perturbation on the sizes of top-hat voids. We also explore the effects on the
    size distribution of voids based on the excursion set theory. We confirm that
    dark energy perturbation negligibly affects the size evolution of voids;$c^2_s
    = 0$ varies the size only by 0.1% as compared to the homogeneous dark energy
    model. We also confirm that dark energy perturbation suppresses the void size
    when w < -1 and enhances the void size when $w > -1$ (Basse et al. 2011). In
    contrast to the negligible impact on the size, we find that the size
    distribution function on scales larger than 10 Mpc/h highly depends on dark
    energy perturbation; compared to the homogeneous dark energy model, the number
    of large voids of radius 30Mpc is 25% larger for the model with $w = -0.9$ and
    $c^2_s = 0$ while they are 20% less abundant for the model with $w = -1.3$ and
    $c^2_s = 0$.

    DOI: 10.1093/mnras/sty1292

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    arXiv

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    Other Link: http://arxiv.org/pdf/1805.03837v2

  34. Intrinsic galaxy alignment from angular dependent primordial non-Gaussianity

    Kogai Kazuhiro, Matsubara Takahiko, Nishizawa Atsushi J., Urakawa Yuko

    JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS   ( 8 )   2018.8

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    DOI: 10.1088/1475-7516/2018/08/014

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  35. Subaru High-z Exploration of Low-luminosity Quasars (SHELLQs). IV. Discovery of 41 Quasars and Luminous Galaxies at 5.7 <= z <= 6.9

    Matsuoka Yoshiki, Iwasawa Kazushi, Onoue Masafusa, Kashikawa Nobunari, Strauss Michael A., Lee Chien-Hsiu, Imanishi Masatoshi, Nagao Tohru, Akiyama Masayuki, Asami Naoko, Bosch James, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kato Nanako, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Morokuma Tomoki, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu, Yamashita Takuji

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   Vol. 237 ( 1 )   2018.7

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    DOI: 10.3847/1538-4365/aac724

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  36. The correlation of extragalactic $γ$-rays with cosmic matter density distributions from weak-gravitational lensing Reviewed

    Masato Shirasaki, Oscar Macias, Shunsaku Horiuchi, Naoki Yoshida, Chien-Hsiu Lee, Atsushi J. Nishizawa

    Phys. Rev. D 97, 123015 (2018)   Vol. 97 ( 12 )   2018.6

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    The extragalactic $\gamma$-ray background (EGB) arises from the accumulation
    of $\gamma$-ray emissions from resolved and unresolved extragalactic sources as
    well as diffuse processes. It is important to study the statistical properties
    of the EGB in the context of cosmological structure formation. Known
    astrophysical $\gamma$-ray sources such as blazars, star-forming galaxies, and
    radio galaxies are expected to trace the underlying cosmic matter density
    distribution. We explore the correlation of the EGB from Fermi-LAT data with
    the large-scale matter density distribution from the Subaru Hyper Suprime-Cam
    (HSC) SSP survey. We reconstruct an unbiased surface matter density
    distribution $\kappa$ at $z<1$ by applying weak-gravitational lensing analysis
    to the first-year HSC data. We then calculate the $\gamma - \kappa$
    cross-correlation. Our measurements are consistent with a null detection, but a
    weak correlation is found at angular scales of 30-60 arcmin, especially when
    distant source galaxies at $z > 1$ are used for the lensing $\kappa$
    reconstruction. The large-scale correlation suggests strong clustering of
    high-redshift $\gamma$-ray sources such as blazars. However, the inferred bias
    factor of $4-5$ is larger by about a factor of two than results from other
    clustering analyses. The final HSC data covering 1,400 squared degrees will
    play an essential role to determine accurately the blazar bias at $z > 0.5$.

    DOI: 10.1103/PhysRevD.97.123015

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    arXiv

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    Other Link: http://arxiv.org/pdf/1802.10257v2

  37. Multiwavelength study of X-ray luminous clusters in the Hyper Suprime-Cam Subaru Strategic Program S16A field (vol 70, S22, 2018)

    Miyaoka Keita, Okabe Nobuhiro, Kitaguchi Takao, Oguri Masamune, Fukazawa Yasushi, Mandelbaum Rachel, Medezinski Elinor, Babazaki Yasunori, Nishizawa Atsushi J., Hamana Takashi, Lin Yen-Ting, Akamatsu Hiroki, Chiu I-Non, Fujita Yutaka, Ichinohe Yuto, Komiyama Yutaka, Sasaki Toru, Takizawa Motokazu, Ueda Shutaro, Umetsu Keiichi, Coupon Jean, Hikage Chiaki, Hoshino Akio, Leauthaud Alexie, Matsushita Kyoko, Mitsuishi Ikuyuki, Miyatake Hironao, Miyazaki Satoshi, More Surhud, Nakazawa Kazuhiro, Ota Naomi, Sato Kousuke, Spergel David, Tamura Takayuki, Tanaka Masayuki, Tanaka Manobu M., Utsumi Yousuke

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70 ( 3 )   2018.6

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    DOI: 10.1093/pasj/psy024

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  38. Source selection for cluster weak lensing measurements in the Hyper Suprime-Cam survey

    Medezinski Elinor, Oguri Masamune, Nishizawa Atsushi J., Speagle Joshua S., Miyatake Hironao, Umetsu Keiichi, Leauthaud Alexie, Murata Ryoma, Mandelbaum Rachel, Sifon Cristobal, Strauss Michael A., Huang Song, Simet Melanie, Okabe Nobuhiro, Tanaka Masayuki, Komiyama Yutaka

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70 ( 2 )   2018.3

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    DOI: 10.1093/pasj/psy009

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  39. A 16 deg$^2$ survey of emission-line galaxies at z<1.5 in HSC-SSP PDR1

    Masao Hayashi, Masayuki Tanaka, Rhythm Shimakawa, Hisanori Furusawa, Rieko Momose, Yusei Koyama, John D. Silverman, Tadayuki Kodama, Yutaka Komiyama, Alexie Leauthaud, Yen-Ting Lin, Satoshi Miyazaki, Tohru Nagao, Atsushi J. Nishizawa, Masami Ouchi, Takatoshi Shibuya, Ken-ichi Tadaki, Kiyoto Yabe

    Publications of the Astronomical Society of Japan   Vol. 70   2018.1

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    We present initial results from the Subaru Strategic Program (SSP) with Hyper
    Suprime-Cam (HSC) on a comprehensive survey of emission-line galaxies at z<1.5
    based on narrowband (NB) imaging. The first Public Data Release (PDR1) provides
    us with data from two NB filters, specifically NB816 and NB921 over 5.7 deg$^2$
    and 16.2 deg$^2$ respectively. The $5 \sigma$ limiting magnitudes are 25.2
    (UDeep layer, 1.4 deg$^2$) and 24.8 (Deep layer, 4.3 deg$^2$) mag in NB816, and
    25.1 (UDeep, 2.9 deg$^2$) and 24.6--24.8 (Deep, 13.3 deg$^2$) mag in NB921. The
    wide-field imaging allows us to construct unprecedentedly large samples of
    8,054 H$\alpha$ emitters at z ~ 0.25 and 0.40, 8,656 [OIII] emitters at z ~
    0.63 and 0.84, and 16,877 [OII] emitters at z ~ 1.19 and 1.47. We map the
    cosmic web on scales out to about 50 comoving Mpc that includes galaxy
    clusters, identified by red sequence galaxies, located at the intersection of
    filamentary structures of star-forming galaxies. The luminosity functions of
    emission-line galaxies are measured with precision and consistent with
    published studies. The wide field coverage of the data enables us to measure
    the luminosity functions up to brighter luminosities than previous studies. The
    comparison of the luminosity functions between the different HSC-SSP fields
    suggests that a survey volume of $>5\times10^5$ Mpc$^3$ is essential to
    overcome cosmic variance. Since the current data have not reached the full
    depth expected for the HSC-SSP, the color cut in i-NB816 or z-NB921 induces a
    bias towards star-forming galaxies with large equivalent widths, primarily seen
    in the stellar mass functions for the H$\alpha$ emitters at z ~ 0.25--0.40.
    Even so, the emission-line galaxies clearly cover a wide range of luminosity,
    stellar mass, and environment, thus demonstrating the usefulness of the NB data
    from the HSC-SSP to investigate star-forming galaxies at z<1.5.

    DOI: 10.1093/pasj/psx088

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    arXiv

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    Other Link: http://arxiv.org/pdf/1704.05978v2

  40. Two- and three-dimensional wide-field weak lensing mass maps from the Hyper Suprime-Cam Subaru Strategic Program S16A data

    Oguri Masamune, Miyazaki Satoshi, Hikage Chiaki, Mandelbaum Rachel, Utsumi Yousuke, Miyatake Hironao, Takada Masahiro, Armstrong Robert, Bosch James, Komiyama Yutaka, Leauthaud Alexie, More Surhud, Nishizawa Atsushi J., Okabe Nobuhiro, Tanaka Masayuki

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx070

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  41. The quasar luminosity function at redshift 4 with the Hyper Suprime-Cam Wide Survey

    Akiyama Masayuki, He Wanqiu, Ikeda Hiroyuki, Niida Mana, Nagao Tohru, Bosch James, Coupon Jean, Enoki Motohiro, Imanishi Masatoshi, Kashikawa Nobunari, Kawaguchi Toshihiro, Komiyama Yutaka, Lee Chien-Hsiu, Matsuoka Yoshiki, Miyazaki Satoshi, Nishizawa Atsushi J., Oguri Masamune, Ono Yoshiaki, Onoue Masafusa, Ouchi Masami, Schulze Andreas, Silverman John D., Tanaka Manobu M., Tanaka Masayuki, Terashima Yuichi, Toba Yoshiki, Ueda Yoshihiro

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx091

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  42. The nature of H alpha-selected galaxies along the large-scale structure at z=0.4 revealed by Subaru Hyper Suprime-Cam survey

    Koyama Yusei, Hayashi Masao, Tanaka Masayuki, Kodama Tadayuki, Shimakawa Rhythm, Yamamoto Moegi, Nakata Fumiaki, Tanaka Ichi, Suzuki Tomoko L., Tadaki Ken-ichi, Nishizawa Atsushi J., Yabe Kiyoto, Toba Yoshiki, Lin Lihwai, Jian Hung-Yu, Komiyama Yutaka

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx078

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  43. The Hyper Suprime-Cam SSP Survey: Overview and survey design

    Aihara Hiroaki, Arimoto Nobuo, Armstrong Robert, Arnouts Stephane, Bahcall Neta A., Bickerton Steven, Bosch James, Bundy Kevin, Capak Peter L., Chan James H. H., Chiba Masashi, Coupon Jean, Egami Eiichi, Enoki Motohiro, Finet Francois, Fujimori Hiroki, Fujimoto Seiji, Furusawa Hisanori, Furusawa Junko, Goto Tomotsugu, Goulding Andy, Greco Johnny P., Greene Jenny E., Gunn James E., Hamana Takashi, Harikane Yuichi, Hashimoto Yasuhiro, Hattori Takashi, Hayashi Masao, Hayashi Yusuke, Helminiak Krzysztof G., Higuchi Ryo, Hikage Chiaki, Ho Paul T. P., Hsieh Bau-Ching, Huang Kuiyun, Huang Song, Ikeda Hiroyuki, Imanishi Masatoshi, Inoue Akio K., Iwasawa Kazushi, Iwata Ikuru, Jaelani Anton T., Jian Hung-Yu, Kamata Yukiko, Karoji Hiroshi, Kashikawa Nobunari, Katayama Nobuhiko, Kawanomoto Satoshi, Kayo Issha, Koda Jin, Koike Michitaro, Kojima Takashi, Komiyama Yutaka, Konno Akira, Koshida Shintaro, Koyama Yusei, Kusakabe Haruka, Leauthaud Alexie, Lee Chien-Hsiu, Lin Lihwai, Lin Yen-Ting, Lupton Robert H., Mandelbaum Rachel, Matsuoka Yoshiki, Medezinski Elinor, Mineo Sogo, Miyama Shoken, Miyatake Hironao, Miyazaki Satoshi, Momose Rieko, More Anupreeta, More Surhud, Moritani Yuki, Moriya Takashi J., Morokuma Tomoki, Mukae Shiro, Murata Ryoma, Murayama Hitoshi, Nagao Tohru, Nakata Fumiaki, Niida Mana, Niikura Hiroko, Nishizawa Atsushi J., Obuchi Yoshiyuki, Oguri Masamune, Oishi Yukie, Okabe Nobuhiro, Okamoto Sakurako, Okura Yuki, Ono Yoshiaki, Onodera Masato, Onoue Masafusa, Osato Ken, Ouchi Masami, Price Paul A., Pyo Tae-Soo, Sako Masao, Sawicki Marcin, Shibuya Takatoshi, Shimasaku Kazuhiro, Shimono Atsushi, Shirasaki Masato, Silverman John D., Simet Melanie, Speagle Joshua, Spergel David N., Strauss Michael A., Sugahara Yuma, Sugiyama Naoshi, Suto Yasushi, Suyu Sherry H., Suzuki Nao, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tamura Naoyuki, Tanaka Manobu M., Tanaka Masaomi, Tanaka Masayuki, Tanaka Yoko, Terai Tsuyoshi, Terashima Yuichi, Toba Yoshiki, Tominaga Nozomu, Toshikawa Jun, Turner Edwin L., Uchida Tomohisa, Uchiyama Hisakazu, Umetsu Keiichi, Uraguchi Fumihiro, Urata Yuji, Usuda Tomonori, Utsumi Yousuke, Wang Shiang-Yu, Wang Wei-Hao, Wong Kenneth C., Yabe Kiyoto, Yamada Yoshihiko, Yamanoi Hitomi, Yasuda Naoki, Yeh Sherry, Yonehara Atsunori, Yuma Suraphong

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx066

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  44. The first-year shear catalog of the Subaru Hyper Suprime-Cam Subaru Strategic Program Survey

    Mandelbaum Rachel, Miyatake Hironao, Hamana Takashi, Oguri Masamune, Simet Melanie, Armstrong Robert, Bosch James, Murata Ryoma, Lanusse Francois, Leauthaud Alexie, Coupon Jean, More Surhud, Takada Masahiro, Miyazaki Satoshi, Speagle Joshua S., Shirasaki Masato, Sifon Cristobal, Huang Song, Nishizawa Atsushi J., Medezinski Elinor, Okura Yuki, Okabe Nobuhiro, Czakon Nicole, Takahashi Ryuichi, Coulton William R., Hikage Chiaki, Komiyama Yutaka, Lupton Robert H., Strauss Michael A., Tanaka Masayuki, Utsumi Yousuke

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx130

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  45. Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). II. Discovery of 32 quasars and luminous galaxies at 5.7 < z <= 6.8

    Matsuoka Yoshiki, Onoue Masafusa, Kashikawa Nobunari, Iwasawa Kazushi, Strauss Michael A., Nagao Tohru, Imanishi Masatoshi, Lee Chien-Hsiu, Akiyama Masayuki, Asami Naoko, Bosch James, Foucaud Sebastien, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Izumi Takuma, Kawaguchi Toshihiro, Kikuta Satoshi, Kohno Kotaro, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Morokuma Tomoki, Murayama Hitoshi, Niida Mana, Nishizawa Atsushi J., Oguri Masamune, Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Schulze Andreas, Shirakata Hikari, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Toba Yoshiki, Utsumi Yousuke, Wang Shiang-Yu

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx046

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  46. Planck Sunyaev-Zel'dovich cluster mass calibration using Hyper Suprime-Cam weak lensing

    Medezinski Elinor, Battaglia Nicholas, Umetsu Keiichi, Oguri Masamune, Miyatake Hironao, Nishizawa Atsushi J., Sifon Cristobal, Spergel David N., Chiu I-Non, Lin Yen-Ting, Bahcall Neta, Komiyama Yutaka

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx128

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  47. Photometric redshifts for Hyper Suprime-Cam Subaru Strategic Program Data Release 1

    Tanaka Masayuki, Coupon Jean, Hsieh Bau-Ching, Mineo Sogo, Nishizawa Atsushi J., Speagle Joshua, Furusawa Hisanori, Miyazaki Satoshi, Murayama Hitoshi

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx077

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  48. Multiwavelength study of X-ray luminous clusters in the Hyper Suprime-Cam Subaru Strategic Program S16A field

    Miyaoka Keita, Okabe Nobuhiro, Kitaguchi Takao, Oguri Masamune, Fukazawa Yasushi, Mandelbaum Rachel, Medezinski Elinor, Babazaki Yasunori, Nishizawa Atsushi J., Hamana Takashi, Lin Yen-Ting, Akamatsu Hiroki, Chiu I-Non, Fujita Yutaka, Ichinohe Yuto, Komiyama Yutaka, Sasaki Toru, Takizawa Motokazu, Ueda Shutaro, Umetsu Keiichi, Coupon Jean, Hikage Chiaki, Hoshino Akio, Leauthaud Alexie, Matsushita Kyoko, Mitsuishi Ikuyuki, Miyatake Hironao, Miyazaki Satoshi, More Surhud, Nakazawa Kazuhiro, Ota Naomi, Sato Kousuke, Spergel David, Tamura Takayuki, Tanaka Masayuki, Tanaka Manobu M., Utsumi Yousuke

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx132

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  49. Luminous quasars do not live in the most overdense regions of galaxies at z similar to 4

    Uchiyama Hisakazu, Toshikawa Jun, Kashikawa Nobunari, Overzier Roderik, Chiang Yi-Kuan, Marinello Murilo, Tanaka Masayuki, Niino Yuu, Ishikawa Shogo, Onoue Masafusa, Ichikawa Kohei, Akiyama Masayuki, Coupon Jean, Harikane Yuichi, Imanishi Masatoshi, Kodama Tadayuki, Komiyama Yutaka, Lee Chien-Hsiu, Lin Yen-Ting, Miyazaki Satoshi, Nagao Tohru, Nishizawa Atsushi J., Ono Yoshiaki, Ouchi Masami, Wang Shiang-Yu

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx112

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  50. Hyper Suprime-Cam: System design and verification of image quality

    Miyazaki Satoshi, Komiyama Yutaka, Kawanomoto Satoshi, Doi Yoshiyuki, Furusawa Hisanori, Hamana Takashi, Hayashi Yusuke, Ikeda Hiroyuki, Kamata Yukiko, Karoji Hiroshi, Koike Michitaro, Kurakami Tomio, Miyama Shoken, Morokuma Tomoki, Nakata Fumiaki, Namikawa Kazuhito, Nakaya Hidehiko, Nariai Kyoji, Obuchi Yoshiyuki, Oishi Yukie, Okada Norio, Okura Yuki, Tait Philip, Takata Tadafumi, Tanaka Yoko, Tanaka Masayuki, Terai Tsuyoshi, Tomono Daigo, Uraguchi Fumihiro, Usuda Tomonori, Utsumi Yousuke, Yamada Yoshihiko, Yamanoi Hitomi, Aihara Hiroaki, Fujimori Hiroki, Mineo Sogo, Miyatake Hironao, Oguri Masamune, Uchida Tomohisa, Tanaka Manobu M., Yasuda Naoki, Takada Masahiro, Murayama Hitoshi, Nishizawa Atsushi J., Sugiyama Naoshi, Chiba Masashi, Futamase Toshifumi, Wang Shiang-Yu, Chen Hsin-Yo, Ho Paul T. P., Liaw Eric J. Y., Chiu Chi-Fang, Ho Cheng-Lin, Lai Tsang-Chih, Lee Yao-Cheng, Jeng Dun-Zen, Iwamura Satoru, Armstrong Robert, Bickerton Steve, Bosch James, Gunn James E., Lupton Robert H., Loomis Craig, Price Paul, Smith Steward, Strauss Michael A., Turner Edwin L., Suzuki Hisanori, Miyazaki Yasuhito, Muramatsu Masaharu, Yamamoto Koei, Endo Makoto, Ezaki Yutaka, Ito Noboru, Kawaguchi Noboru, Sofuku Satoshi, Taniike Tomoaki, Akutsu Kotaro, Dojo Naoto, Kasumi Kazuyuki, Matsuda Toru, Imoto Kohei, Miwa Yoshinori, Suzuki Masayuki, Takeshi Kunio, Yokota Hideo

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx063

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  51. GOLDRUSH. II. Clustering of galaxies at z similar to 4-6 revealed with the half-million dropouts over the 100 deg(2) area corresponding to 1 Gpc(3)

    Harikane Yuichi, Ouchi Masami, Ono Yoshiaki, Saito Shun, Behroozi Peter, More Surhud, Shimasaku Kazuhiro, Toshikawa Jun, Lin Yen-Ting, Akiyama Masayuki, Coupon Jean, Komiyama Yutaka, Konno Akira, Lin Sheng-Chieh, Miyazaki Satoshi, Nishizawa Atsushi J., Shibuya Takatoshi, Silverman John

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx097

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  52. First results on the cluster galaxy population from the Subaru Hyper Suprime-Cam survey. II. Faint end color-magnitude diagrams and radial profiles of red and blue galaxies at 0.1 < z < 1.1

    Nishizawa Atsushi J., Oguri Masamune, Oogi Taira, More Surhud, Nishimichi Takahiro, Nagashima Masahiro, Lin Yen-Ting, Mandelbaum Rachel, Takada Masahiro, Bahcall Neta, Coupon Jean, Huang Song, Jian Hung-Yu, Komiyama Yutaka, Leauthaud Alexie, Lin Lihwai, Miyatake Hironao, Miyazaki Satoshi, Tanaka Masayuki

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx106

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  53. First results on the cluster galaxy population from the Subaru Hyper Suprime-Cam survey. I. The role of group or cluster environment in star formation quenching from z=0.2 to 1.1

    Jian Hung-Yu, Lin Lihwai, Oguri Masamune, Nishizawa Atsushi J., Takada Masahiro, More Surhud, Koyama Yusei, Tanaka Masayuki, Komiyama Yutaka

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx096

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  54. First data release of the Hyper Suprime-Cam Subaru Strategic Program

    Aihara Hiroaki, Armstrong Robert, Bickerton Steven, Bosch James, Coupon Jean, Furusawa Hisanori, Hayashi Yusuke, Ikeda Hiroyuki, Kamata Yukiko, Karoji Hiroshi, Kawanomoto Satoshi, Koike Michitaro, Komiyama Yutaka, Lang Dustin, Lupton Robert H., Mineo Sogo, Miyatake Hironao, Miyazaki Satoshi, Morokuma Tomoki, Obuchi Yoshiyuki, Oishi Yukie, Okura Yuki, Price Paul A., Takata Tadafumi, Tanaka Manobu M., Tanaka Masayuki, Tanaka Yoko, Uchida Tomohisa, Uraguchi Fumihiro, Utsumi Yousuke, Wang Shiang-Yu, Yamada Yoshihiko, Yamanoi Hitomi, Yasuda Naoki, Arimoto Nobuo, Chiba Masashi, Finet Francois, Fujimori Hiroki, Fujimoto Seiji, Furusawa Junko, Goto Tomotsugu, Goulding Andy, Gunn James E., Harikane Yuichi, Hattori Takashi, Hayashi Masao, Helminiak Krzysztof G., Higuchi Ryo, Hikage Chiaki, Ho Paul T. P., Hsieh Bau-Ching, Huang Kuiyun, Huang Song, Imanishi Masatoshi, Iwata Ikuru, Jaelani Anton T., Jian Hung-Yu, Kashikawa Nobunari, Katayama Nobuhiko, Kojima Takashi, Konno Akira, Koshida Shintaro, Kusakabe Haruka, Leauthaud Alexie, Lee Chien-Hsiu, Lin Lihwai, Lin Yen-Ting, Mandelbaum Rachel, Matsuoka Yoshiki, Medezinski Elinor, Miyama Shoken, Momose Rieko, More Anupreeta, More Surhud, Mukae Shiro, Murata Ryoma, Murayama Hitoshi, Nagao Tohru, Nakata Fumiaki, Niida Mana, Niikura Hiroko, Nishizawa Atsushi J., Oguri Masamune, Okabe Nobuhiro, Ono Yoshiaki, Onodera Masato, Onoue Masafusa, Ouchi Masami, Pyo Tae-Soo, Shibuya Takatoshi, Shimasaku Kazuhiro, Simet Melanie, Speagle Joshua, Spergel David N., Strauss Michael A., Sugahara Yuma, Sugiyama Naoshi, Suto Yasushi, Suzuki Nao, Tait Philip J., Takada Masahiro, Terai Tsuyoshi, Toba Yoshiki, Turner Edwin L., Uchiyama Hisakazu, Umetsu Keiichi, Urata Yuji, Usuda Tomonori, Yeh Sherry, Yuma Suraphong

    PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN   Vol. 70   2018.1

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    DOI: 10.1093/pasj/psx081

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  55. Enhancement of Galaxy Overdensity around Quasar Pairs at z<3.6 based on the Hyper Suprime-Cam Subaru Strategic Program Survey Reviewed

    Masafusa Onoue, Nobunari Kashikawa, Hisakazu Uchiyama, Masayuki Akiyama, Yuichi Harikane, Masatoshi Imanishi, Yutaka Komiyama, Yoshiki Matsuoka, Tohru Nagao, Atsushi J. Nishizawa, Masamune Oguri, Masami Ouchi, Masayuki Tanaka, Yoshiki Toba, Jun Toshikawa

    Publications of the Astronomical Society of Japan   Vol. 70   2018.1

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    We investigate the galaxy overdensity around proto-cluster scale quasar pairs
    at high (z>3) and low (z~1) redshift based on the unprecedentedly wide and deep
    optical survey of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP).
    Using the first-year survey data covering effectively ~121 deg^2 with the
    5sigma depth of i~26.4 and the SDSS DR12Q catalog, we find two luminous pairs
    at z~3.3 and 3.6 which reside in >5sigma overdense regions of g-dropout
    galaxies at i<25. The projected separations of the two pairs are R_perp=1.75
    and 1.04 proper Mpc, and their velocity offsets are Delta V=692 and 1448 km
    s^{-1}, respectively. This result is in clear contrast to the average z~4
    quasar environments as discussed in Uchiyama et al. (2017) and implies that the
    quasar activities of the pair members are triggered via major mergers in
    proto-clusters, unlike the vast majority of isolated quasars in general fields
    that may turn on via non-merger events such as bar and disk instabilities. At
    z~1, we find 37 pairs with R_perp<2 pMpc and Delta V<2300 km s^{-1} in the
    current HSC-Wide coverage, including four from Hennawi et al. (2006). The
    distribution of the peak overdensity significance within two arcminutes around
    the pairs has a long tail toward high density (>4sigma) regions. Thanks to the
    large sample size, we find a statistical evidence that this excess is unique to
    the pair environments when compared to single quasar and randomly selected
    galaxy environments at the same redshift range. Moreover, there are nine
    small-scale (R_perp<1 pMpc) pairs, two of which are found to reside in cluster
    fields. Our results demonstrate that <2 pMpc-scale quasar pairs at both
    redshift range tend to occur in massive haloes, although perhaps not the most
    massive ones, and that they are useful to search for rare density peaks.

    DOI: 10.1093/pasj/psx092

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    Other Link: http://arxiv.org/pdf/1704.06051v2

  56. Clustering of quasars in a wide luminosity range at redshift 4 with Subaru Hyper Suprime-Cam wide field imaging Reviewed

    Wanqiu He, Masayuki Akiyama, James Bosch, Motohiro Enoki, Yuichi Harikane, Hiroyuki Ikeda, Nobunari Kashikawa, Toshihiro Kawaguchi, Yutaka Komiyama, Chien-Hsiu Lee, Yoshiki Matsuoka, Satoshi Miyazaki, Tohru Nagao, Masahiro Nagashima, Mana Niida, Atsushi J Nishizawa, Masamune Oguri, Masafusa Onoue, Taira Oogi, Masami Ouchi, Andreas Schulze, Yuji Shirasaki, John D. Silverman, Manobu M. Tanaka, Masayuki Tanaka, Yoshiki Toba, Hisakazu Uchiyama, Takuji Yamashita

    Publications of the Astronomical Society of Japan   Vol. 70   2018.1

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    We examine the clustering of quasars over a wide luminosity range, by
    utilizing 901 quasars at $\overline{z}_{\rm phot}\sim3.8$ with $-24.73<M_{\rm
    1450}<-22.23$ photometrically selected from the Hyper Suprime-Cam Subaru
    Strategic Program (HSC-SSP) S16A Wide2 date release and 342 more luminous
    quasars at $3.4<z_{\rm spec}<4.6$ having $-28.0<M_{\rm 1450}<-23.95$ from the
    Sloan Digital Sky Survey (SDSS) that fall in the HSC survey fields. We measure
    the bias factors of two quasar samples by evaluating the cross-correlation
    functions (CCFs) between the quasar samples and 25790 bright $z\sim4$ Lyman
    Break Galaxies (LBGs) in $M_{\rm 1450}<-21.25$ photometrically selected from
    the HSC dataset. Over an angular scale of \timeform{10.0"} to
    \timeform{1000.0"}, the bias factors are $5.93^{+1.34}_{-1.43}$ and
    $2.73^{+2.44}_{-2.55}$ for the low and high luminosity quasars, respectively,
    indicating no luminosity dependence of quasar clustering at $z\sim4$. It is
    noted that the bias factor of the luminous quasars estimated by the CCF is
    smaller than that estimated by the auto-correlation function (ACF) over a
    similar redshift range, especially on scales below \timeform{40.0"}. Moreover,
    the bias factor of the less-luminous quasars implies the minimal mass of their
    host dark matter halos (DMHs) is $0.3$-$2\times10^{12}h^{-1}M_{\odot}$,
    corresponding to a quasar duty cycle of $0.001$-$0.06$.

    DOI: 10.1093/pasj/psx129

    Web of Science

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    arXiv

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    Other Link: http://arxiv.org/pdf/1704.08461v1

  57. Clustering of galaxies around AGN in the HSC Wide survey Reviewed

    Yuji Shirasaki, Masayuki Akiyama, Tohru Nagao, Yoshiki Toba, Wanqiu He, Masatoshi Ohishi, Yoshihiko Mizumoto, Satoshi Miyazaki, Atsushi J. Nishizawa, Tomonori Usuda

    Publications of the Astronomical Society of Japan   Vol. 70   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Oxford University Press  

    We have measured the clustering of galaxies around active galactic nuclei
    (AGN) for which single-epoch virial masses of the super-massive black hole
    (SMBH) are available to investigate the relation between the large scale
    environment of AGNs and the evolution of SMBHs. The AGN samples used in this
    work were derived from the Sloan Digital Sky Survey (SDSS) observations and the
    galaxy samples were from 240~deg$^{2}$ S15b data of the Hyper Suprime-Cam
    Subaru Strategic Program (HSC-SSP). The investigated redshift range is
    0.6--3.0, and the masses of the SMBHs lie in the range
    $10^{7.5}$--$10^{10}$~M$_{\odot}$. The absolute magnitude of the galaxy samples
    reaches to $M_{\lambda 310}$ $\sim$ $-$18 at rest frame wavelength 310~nm for
    the low-redshift end of the samples. More than 70\% of the galaxies in the
    analysis are blue. We found a significant dependence of the cross-correlation
    length on redshift, which primarily reflects the brightness dependence of the
    galaxy clustering. At the lowest redshifts the cross-correlation length
    increases from 7~$h^{-1}$~Mpc around $M_{\lambda 310}$$ = $$-19$~mag to
    $>$10~$h^{-1}$~Mpc beyond $M_{\lambda 310}$$ = $$-20$~mag. No significant
    dependence of the cross-correlation length on BH mass was found for whole
    galaxy samples dominated by blue galaxies, while there was an indication of BH
    mass dependence in the cross-correlation with red galaxies. These results
    provides a picture of the environment of AGNs studied in this paper being
    enriched with blue starforming galaxies, and a fraction of the galaxies are
    being evolved to red galaxies along with the evolution of SMBHs in that system.

    DOI: 10.1093/pasj/psx099

    Web of Science

    Scopus

    arXiv

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    Other Link: http://arxiv.org/pdf/1704.05971v2

  58. An optically-selected cluster catalog at redshift 0.1<z<1.1 from the Hyper Suprime-Cam Subaru Strategic Program S16A data Reviewed

    Masamune Oguri, Yen-Ting Lin, Sheng-Chieh Lin, Atsushi J. Nishizawa, Anupreeta More, Surhud More, Bau-Ching Hsieh, Elinor Medezinski, Hironao Miyatake, Hung-Yu Jian, Lihwai Lin, Masahiro Takada, Nobuhiro Okabe, Joshua S. Speagle, Jean Coupon, Alexie Leauthaud, Robert H. Lupton, Satoshi Miyazaki, Paul A. Price, Masayuki Tanaka, I-Non Chiu, Yutaka Komiyama, Yuki Okura, Manobu M. Tanaka, Tomonori Usuda

    Publications of the Astronomical Society of Japan   Vol. 70   2018.1

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Oxford University Press  

    We present an optically-selected cluster catalog from the Hyper Suprime-Cam
    (HSC) Subaru Strategic Program. The HSC images are sufficiently deep to detect
    cluster member galaxies down to $M_*\sim 10^{10.2}M_\odot$ even at $z\sim 1$,
    allowing a reliable cluster detection at such high redshifts. We apply the
    CAMIRA algorithm to the HSC Wide S16A dataset covering $\sim 232$ deg$^2$ to
    construct a catalog of 1921 clusters at redshift $0.1<z<1.1$ and richness
    $\hat{N}_{\rm mem}>15$ that roughly corresponds to $M_{\rm 200m}\gtrsim
    10^{14}h^{-1}M_\odot$. We confirm good cluster photometric redshift
    performance, with the bias and scatter in $\Delta z/(1+z)$ being better than
    0.005 and 0.01 over most of the redshift range, respectively. We compare our
    cluster catalog with large X-ray cluster catalogs from XXL and XMM-LSS surveys
    and find good correlation between richness and X-ray properties. We also study
    the miscentering effect from the distribution of offsets between optical and
    X-ray cluster centers. We confirm the high ($>0.9$) completeness and purity for
    high mass clusters by analyzing mock galaxy catalogs.

    DOI: 10.1093/pasj/psx042

    Web of Science

    Scopus

    arXiv

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    Other Link: http://arxiv.org/pdf/1701.00818v2

  59. First Results on the Cluster Galaxy Population from the Subaru Hyper Suprime-Cam Survey. III. Brightest Cluster Galaxies, Stellar Mass Distribution, and Active Galaxies

    Lin Yen-Ting, Hsieh Bau-Ching, Lin Sheng-Chieh, Oguri Masamune, Chen Kai-Feng, Tanaka Masayuki, Chiu I-Non, Huang Song, Kodama Tadayuki, Leauthaud Alexie, More Surhud, Nishizawa Atsushi J., Bundy Kevin, Lin Lihwai, Miyazaki Satoshi

    ASTROPHYSICAL JOURNAL   Vol. 851 ( 2 )   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3847/1538-4357/aa9bf5

    Web of Science

  60. Deep Optical Imaging of the COSMOS Field with Hyper Suprime-Cam Using Data from the Subaru Strategic Program and the University of Hawaii Reviewed

    Masayuki Tanaka, Guenther Hasinger, John D. Silverman, Steven Bickerton, Hisanori Furusawa, Yuichi Harikane, Esther Hu, Hiroyuki Ikeda, Yanxia Li, Henry J. McCracken, Paul A. Price, Michael A. Strauss, Michitaro Koike, Yutaka Komiyama, Sogo Mineo, Satoshi Miyazaki, Atsushi J. Nishizawa, Tadafumi Takata, Yousuke Utsumi, Yoshihiko Yamada, Naoki Yasuda

        2017.6

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    We present the deepest optical images of the COSMOS field based on a joint
    dataset taken with Hyper Suprime-Cam (HSC) by the HSC Subaru Strategic Program
    (SSP) team and the University of Hawaii (UH). The COSMOS field is one of the
    key extragalactic fields with a wealth of deep, multi-wavelength data. However,
    the current optical data are not sufficiently deep to match with, e.g., the
    UltraVista data in the near-infrared. The SSP team and UH have joined forces to
    produce very deep optical images of the COSMOS field by combining data from
    both teams. The coadd images reach depths of g=27.8, r=27.7, i=27.6, z=26.8,
    and y=26.2 mag at 5 sigma for point sources based on flux uncertainties quoted
    by the pipeline and they cover essentially the entire COSMOS 2 square degree
    field. The seeing is between 0.6 and 0.9 arcsec on the coadds. We perform
    several quality checks and confirm that the data are of science quality; ~2%
    photometry and 30 mas astrometry. This accuracy is identical to the Public Data
    Release 1 from HSC-SSP. We make the joint dataset including fully calibrated
    catalogs of detected objects available to the community at
    https://hsc-release.mtk.nao.ac.jp/.

    arXiv

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    Other Link: http://arxiv.org/pdf/1706.00566v1

  61. GALAXY-SCALE GRAVITATIONAL LENS CANDIDATES FROM THE HYPER SUPRIME-CAM IMAGING SURVEY AND THE GALAXY AND MASS ASSEMBLY SPECTROSCOPIC SURVEY

    Chan James H. H., Suyu Sherry H., More Anupreeta, Oguri Masamune, Chiueh Tzihong, Coupon Jean, Hsieh Bau-Ching, Komiyama Yutaka, Miyazaki Satoshi, Murayama Hitoshi, Nishizawa Atsushi J., Price Paul, Tait Philip J., Terai Tsuyoshi, Utsumi Yousuke, Wang Shiang-Yu

    ASTROPHYSICAL JOURNAL   Vol. 832 ( 2 )   2016.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.3847/0004-637X/832/2/135

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  62. A New Milky Way Satellite Discovered In The Subaru/Hyper Suprime-Cam Survey Reviewed

    Daisuke Homma, Masashi Chiba, Sakurako Okamoto, Yutaka Komiyama, Masayuki Tanaka, Mikito Tanaka, Miho N. Ishigaki, Masayuki Akiyama, Nobuo Arimoto, Jose A. Garmilla, Robert H. Lupton, Michael A. Strauss, Hisanori Furusawa, Satoshi Miyazaki, Hitoshi Murayama, Atsushi J. Nishizawa, Masahiro Takada, Tomonori Usuda, Shiang-Yu Wang

    ASTROPHYSICAL JOURNAL   Vol. 832 ( 1 )   2016.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We report the discovery of a new ultra-faint dwarf satellite companion of the
    Milky Way based on the early survey data from the Hyper Suprime-Cam Subaru
    Strategic Program. This new satellite, Virgo I, which is located in the
    constellation of Virgo, has been identified as a statistically significant (5.5
    sigma) spatial overdensity of star-like objects with a well-defined main
    sequence and red giant branch in their color-magnitude diagram. The
    significance of this overdensity increases to 10.8 sigma when the relevant
    isochrone filter is adopted for the search. Based on the distribution of the
    stars around the likely main sequence turn-off at r ~ 24 mag, the distance to
    Virgo I is estimated as 87 kpc, and its most likely absolute magnitude
    calculated from a Monte Carlo analysis is M_V = -0.8 +/- 0.9 mag. This stellar
    system has an extended spatial distribution with a half-light radius of 38
    +12/-11 pc, which clearly distinguishes it from a globular cluster with
    comparable luminosity. Thus, Virgo I is one of the faintest dwarf satellites
    known and is located beyond the reach of the Sloan Digital Sky Survey. This
    demonstrates the power of this survey program to identify very faint dwarf
    satellites. This discovery of VirgoI is based only on about 100 square degrees
    of data, thus a large number of faint dwarf satellites are likely to exist in
    the outer halo of the Milky Way.

    DOI: 10.3847/0004-637X/832/1/21

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    arXiv

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    Other Link: http://arxiv.org/pdf/1609.04346v2

  63. Reconstruction of missing data using iterative harmonic expansion

    Nishizawa Atsushi J., Inoue Kaiki Taro

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 462 ( 1 ) page: 588-600   2016.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/mnras/stw1664

    Web of Science

  64. SUBARU HIGH-z EXPLORATION OF LOW-LUMINOSITY QUASARS (SHELLQs). I. DISCOVERY OF 15 QUASARS AND BRIGHT GALAXIES AT 5.7 < z < 6.9

    Matsuoka Yoshiki, Onoue Masafusa, Kashikawa Nobunari, Iwasawa Kazushi, Strauss Michael A., Nagao Tohru, Imanishi Masatoshi, Niida Mana, Toba Yoshiki, Akiyama Masayuki, Asami Naoko, Bosch James, Foucaud Sebastien, Furusawa Hisanori, Goto Tomotsugu, Gunn James E., Harikane Yuichi, Ikeda Hiroyuki, Kawaguchi Toshihiro, Kikuta Satoshi, Komiyama Yutaka, Lupton Robert H., Minezaki Takeo, Miyazaki Satoshi, Morokuma Tomoki, Murayama Hitoshi, Nishizawa Atsushi J., Ono Yoshiaki, Ouchi Masami, Price Paul A., Sameshima Hiroaki, Silverman John D., Sugiyama Naoshi, Tait Philip J., Takada Masahiro, Takata Tadafumi, Tanaka Masayuki, Tang Ji-Jia, Utsumi Yousuke

    ASTROPHYSICAL JOURNAL   Vol. 828 ( 1 )   2016.9

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    DOI: 10.3847/0004-637X/828/1/26

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  65. The integrated Sachs-Wolfe effect and the Rees-Sciama effect

    Nishizawa Atsushi J.

    PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS   ( 6 )   2014.6

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    DOI: 10.1093/ptep/ptu062

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  66. Baryon acoustic oscillations with the cross-correlation of spectroscopic and photometric samples Reviewed

    Atsushi J. Nishizawa, Masamune Oguri, Masahiro Takada

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 433 ( 1 ) page: 730 - 739   2013.7

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:OXFORD UNIV PRESS  

    The baryon acoustic oscillation (BAO) experiment requires a sufficiently
    dense sampling of large-scale structure tracers with spectroscopic redshift,
    which is observationally expensive especially at high redshifts $z\simgt 1$.
    Here we present an alternative route of the BAO analysis that uses the
    cross-correlation of sparse spectroscopic tracers with a much denser
    photometric sample, where the spectroscopic tracers can be quasars or bright,
    rare galaxies that are easier to access spectroscopically. We show that
    measurements of the cross-correlation as a function of the transverse comoving
    separation rather than the angular separation avoid a smearing of the BAO
    feature without mixing the different scales at different redshifts in the
    projection, even for a wide redshift slice $\Delta z\simeq 1$. The bias,
    scatter, and catastrophic redshift errors of the photometric sample affect only
    the overall normalization of the cross-correlation which can be marginalized
    over when constraining the angular diameter distance. As a specific example, we
    forecast an expected accuracy of the BAO geometrical test via the
    cross-correlation of the SDSS and BOSS spectroscopic quasar sample with a dense
    photometric galaxy sample that is assumed to have a full overlap with the
    SDSS/BOSS survey region. We show that this cross-correlation BAO analysis
    allows us to measure the angular diameter distances to a fractional accuracy of
    about 10% at each redshift bin over $1\simlt z\simlt 3$, if the photometric
    redshift errors of the galaxies, $\sigma_z/(1+z)$, are better than 10-20%
    level.

    DOI: 10.1093/mnras/stt761

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    arXiv

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    Other Link: http://arxiv.org/pdf/1302.6015v2

  67. Perturbation theory for the non-linear halo power spectrum: the renormalized bias and halo bias

    Nishizawa Atsushi J., Takada Masahiro, Nishimichi Takahiro

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 433 ( 1 ) page: 209-220   2013.7

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    DOI: 10.1093/mnras/stt716

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  68. Subaru weak lensing measurement of a z=0.81 cluster discovered by the Atacama Cosmology Telescope Survey

    Miyatake Hironao, Nishizawa Atsushi J., Takada Masahiro, Mandelbaum Rachel, Mineo Sogo, Aihara Hiroaki, Spergel David N., Bickerton Steven J., Bond J. Richard, Gralla Megan, Hajian Amir, Hilton Matt, Hincks Adam D., Hughes John P., Infante Leopoldo, Lin Yen-Ting, Lupton Robert H., Marriage Tobias A., Marsden Danica, Menanteau Felipe, Miyazaki Satoshi, Moodley Kavilan, Niemack Michael D., Oguri Masamune, Price Paul A., Reese Erik D., Sifon Cristobal, Wollack Edward J., Yasuda Naoki

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   Vol. 429 ( 4 ) page: 3627-3644   2013.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1093/mnras/sts643

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  69. DUEL Summar Conference (Ten Years of Cosmic Shear)

      Vol. 103 ( 11 ) page: .   2010.10

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    CiNii Article

  70. A Clipping Method to Mitigate the Impact of Catastrophic Photometric Redshift Errors on Weak Lensing Tomography Reviewed

    Atsushi J. Nishizawa, Masahiro Takada, Takashi Hamana, Hisanori Furusawa

    ASTROPHYSICAL JOURNAL   Vol. 718 ( 2 ) page: 1252 - 1265   2010.8

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:IOP PUBLISHING LTD  

    We use the mock catalog of galaxies, constructed based on the COSMOS galaxy
    catalog including information on photometric redshifts (photo-z) and SED types
    of galaxies, in order to study how to define a galaxy subsample suitable for
    weak lensing tomography feasible with optical (and NIR) multi-band data. Since
    most of useful cosmological information arises from the sample variance limited
    regime for upcoming lensing surveys, a suitable subsample can be obtained by
    discarding a large fraction of galaxies that have less reliable photo-z
    estimations. We develop a method to efficiently identify photo-z outliers by
    monitoring the width of posterior likelihood function of redshift estimation
    for each galaxies. This clipping method may allow to obtain clean tomographic
    redshift bins (here three bins considered) that have almost no overlaps between
    different bins, by discarding more than 70% galaxies of ill-defined photo-z's
    corresponding to the number densities of remaining galaxies less than 20 per
    square arcminutes for a Subaru-type deep survey. Restricting the ranges of
    magnitudes and redshifts and/or adding near infrared data help obtain a cleaner
    redshift binning. By using the Fisher information matrix formalism, we
    propagate photo-z errors into biases in the dark energy equation of state
    parameter w. We found that, by discarding most of ill-defined photo-z galaxies,
    the bias in w can be reduced to the level comparable to the marginalized
    statistical error, however, the residual, small systematic bias remains due to
    asymmetric scatters around the relation between photometric and true redshifts.
    We also use the mock catalog to estimate the cumulative signal-to-noise (S/N)
    ratios for measuring the angular cross-correlations of galaxies between finner
    photo-z bins, finding the higher S/N values for photo-z bins including photo-z
    outliers.

    DOI: 10.1088/0004-637X/718/2/1252

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    arXiv

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    Other Link: http://arxiv.org/pdf/1002.2476v2

  71. Development of public science archive system of Subaru telescope(5)

    Report of the National Astronomical Observatory of Japan   Vol. 12 ( 3 ) page: 53-78   2009.10

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    CiNii Article

  72. SIMULATIONS OF BARYON ACOUSTIC OSCILLATIONS. II. COVARIANCE MATRIX OF THE MATTER POWER SPECTRUM

    Takahashi Ryuichi, Yoshida Naoki, Takada Masahiro, Matsubara Takahiko, Sugiyama Naoshi, Kayo Issha, Nishizawa Atsushi J., Nishimichi Takahiro, Saito Shun, Taruya Atsushi

    ASTROPHYSICAL JOURNAL   Vol. 700 ( 1 ) page: 479-490   2009.7

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    DOI: 10.1088/0004-637X/700/1/479

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  73. Cosmic microwave background-weak lensing correlation: Analytical and numerical study of nonlinearity and implications for dark energy

    Nishizawa Atsushi J., Komatsu Eiichiro, Yoshida Naoki, Takahashi Ryuichi, Sugiyama Naoshi

    ASTROPHYSICAL JOURNAL LETTERS   Vol. 676 ( 2 ) page: L93-L96   2008.4

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    Web of Science

  74. Cosmic Microwave Background--Weak Lensing Correlation: Analytical and Numerical Study of Non-linearity and Implications for Dark Energy Reviewed

    Atsushi J. Nishizawa, Eiichiro Komatsu, Naoki Yoshida, Ryuichi Takahashi, Naoshi Sugiyama

    Astrophysical Journal   Vol. 676 ( 2 ) page: L93 - L96   2007.11

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Physics Publishing  

    Non-linear evolution of density fluctuations yields secondary anisotropies in
    the cosmic microwave background (CMB), which are correlated with the same
    density fluctuations that can be measured by weak lensing (WL) surveys. We
    study the CMB-WL correlation using analytical models as well as $N$-body
    simulations. We show that an analytical model based upon the time derivative of
    non-linear matter power spectrum agrees with simulations. All-sky
    cosmic-variance limited CMB and WL surveys allow us to measure the correlation
    from non-linearity with high significance ($50\sigma$) for $l_{\rm max}=10^4$,
    whereas the forthcoming missions such as Planck and LSST are expected to yield
    only marginal detections. The CMB-WL correlation is sensitive to the time
    derivative of structure growth. We study how this property may be used to
    constrain the nature of dark energy. While the expected constraints are not
    very strong, they may provide a cross check of results from other observations.

    DOI: 10.1086/587741

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    Other Link: http://arxiv.org/pdf/0711.1696v1

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Presentations 1

  1. HSCサーベイによる赤方偏移0.6‐3.0におけるAGN周辺銀河の特性

    白崎裕治, 秋山正幸, 長尾透, 鳥羽儀樹, 何晩秋, 大石雅寿, 水本好彦, 宮崎聡, 西澤淳, 臼田知史

    日本天文学会年会講演予稿集  2017.8.20 

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    Event date: 2017.8

    Language:Japanese   Presentation type:Oral presentation (general)  

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KAKENHI (Grants-in-Aid for Scientific Research) 5

  1. Exploring the origin of cosmic acceleration using the final data from Subaru HSC

    Grant number:20H01932  2020.4 - 2024.3

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    Authorship:Coinvestigator(s) 

  2. ダークエネルギーの理論モデル構築とその観測的検証

    2019.4 - 2020.3

    科学研究費補助金  新学術領域研究

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    Authorship:Coinvestigator(s) 

  3. ボイド構造の精密モデリングと宇宙論検証への応用

    2016.4 - 2018.3

    科学研究費補助金  新学術領域研究

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    Authorship:Principal investigator 

  4. Precise modeling of void in large-scale structure and application to the cosmological constraint

    Grant number:16H01096  2016.4 - 2018.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

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    Authorship:Principal investigator 

    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

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  5. ダークエネルギーの理論モデル構築とその観測的検証

    Grant number:15H05890  2015.6 - 2020.3

    日本学術振興会  科学研究費助成事業 新学術領域研究(研究領域提案型)  新学術領域研究(研究領域提案型)

    杉山 直, 野尻 伸一, 市來 淨與, 辻川 信二, 西澤 淳, 松原 隆彦

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    Authorship:Coinvestigator(s) 

    現在の宇宙の加速膨張を説明するために様々なモデルを考え、その観測による検証について考察した。
    まず、ダークエネルギーが、スカラー場の真空エネルギーによって担われている可能性について、通常の場合に行なっている空間の曲率を平坦に仮定するという制限を設けず、一般の曲率の場合について宇宙マイクロ波背景放射の温度ゆらぎの最新観測であるPLANCK衛星の結果を用いて、制限を与える一連の研究を行った。
    次に、ダークエネルギーが流体のようなダイナミカルな性質を持つ場合について検討を行った。この場合には、宇宙の大規模構造を反映してそのエネルギー密度に空間的な揺らぎを伴うことが予想される。そこでダークエネルギーの密度揺らぎがボイドの数分布、およびサイズ分布に及ぼす影響を解析的に評価した。
    さらに、ダークエネルギーの代替となる修正重力理論についても検討を進めた。新たに考えたモデルとしては、 F(G) 重力模型にラグランジェ乗数場を導入したもの、スカラー場の高階微分を持つ模型とF(R)重力理論を合わせた模型などである。また、展開半径というものを拡張重力理論で求め、模型に対する観測的な制限を求めた。更に、ツァリス統計と拡張重力理論の関係を考察し、その統計性に基づく模型の構成、宇宙項の量子的な問題を解決するために位相的場の理論の模型を考察したほか、磁場中や粘性流体中での重力波の伝播を研究し、宇宙論的な制限について考察した。中性子星合体からの重力波の伝搬速度が光速と矛盾がない、という観測事実から、それと矛盾しないスカラーテンソル理論に基づくダークエネルギーモデルを新たに構築し、その観測的な兆候を明らかにする研究も進めた。また、スカラーベクトルテンソル理論に基づく宇宙論、特に線形密度ゆらぎの従う基礎方程式と安定性の条件を一般的に導出し、その結果をダークエネルギーの物理に応用した。

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Teaching Experience (Off-campus) 2

  1. exercise for information science

    2016.10 - 2017.3 Nagoya University)

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  2. communicating the fun of academic research

    2013.5 Nagoya University)

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