2022/07/20 更新

写真a

カシノ ダイチ
柏野 大地
KASHINO Daichi
所属
高等研究院 特任助教
大学院理学研究科 特任助教
職名
特任助教

学位 2

  1. 博士 (理学) ( 2016年8月   名古屋大学 ) 

  2. 修士 (理学) ( 2014年3月   名古屋大学 ) 

研究キーワード 5

  1. 銀河間ガス

  2. 宇宙再電離

  3. 銀河

  4. 銀河形成

  5. 銀河進化

研究分野 3

  1. 自然科学一般 / 天文学  / 銀河天文学

  2. 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする実験

  3. 自然科学一般 / 素粒子、原子核、宇宙線、宇宙物理にする理論

経歴 2

  1. 名古屋大学   高等研究院   特任助教

    2020年10月 - 現在

  2. スイス連邦工科大学チューリッヒ校   ポスドク

    2016年10月 - 2020年10月

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    国名:スイス連邦

学歴 1

  1. 名古屋大学   大学院理学研究科   素粒子宇宙物理学専攻

    2011年4月 - 2016年8月

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    国名: 日本国

所属学協会 1

  1. 日本天文学会

    2011年4月 - 現在

受賞 1

  1. 第35回 (2018年度) 井上研究奨励賞

    2018年12月   井上科学振興財団   中間赤方偏移における星形成銀河の物理的性質と環境

    柏野大地

 

論文 27

  1. The 2175 angstrom Dust Feature in Star-forming Galaxies at 1.3 <= z <= 1.8: The Dependence on Stellar Mass and Specific Star Formation Rate 査読有り

    Kashino Daichi, Lilly Simon J., Silverman John D., Renzini Alvio, Daddi Emanuele, Bardelli Sandro, Cucciati Olga, Kartaltepe Jeyhan S., Mainieri Vincenzo, Pello Roser, Peng Ying-jie, Sanders David B., Zucca Elena

    ASTROPHYSICAL JOURNAL   909 巻 ( 2 ) 頁: 213 - 213   2021年3月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal  

    We present direct spectroscopic measurements of the broad 2175 Å absorption feature in 505 star-forming main-sequence galaxies at 1.3 ≤ z ≤ 1.8 using individual and stacked spectra from the zCOSMOS-deep survey. Significant 2175 Å excess absorption features of moderate strength are measured, especially in the composite spectra. The excess absorption is well described by a Drude profile. The bump amplitude expressed in units of k(λ) = A(λ)/E(B - V), relative to the featureless Calzetti et al. law, has a range B k ≈ 0.2-0.8. The bump amplitude decreases with the specific star formation rate (sSFR), while it increases moderately with the stellar mass. However, a comparison with local "starburst"galaxies shows that the high-redshift main-sequence galaxies have stronger bump features, despite having a higher sSFR than the local sample. Plotting the bump strength against the relative to the main sequence, however, brings the two samples into much better concordance. This may indicate that it is the recent star formation history of the galaxies that determines the bump strength through the destruction of small carbonaceous grains by supernovae and intense radiation fields coupled with the time delay of ∼1 Gyr in the appearance of carbon-rich asymptotic giant branch stars.

    DOI: 10.3847/1538-4357/abdf62

    Web of Science

    Scopus

    その他リンク: https://iopscience.iop.org/article/10.3847/1538-4357/abdf62/pdf

  2. Evidence for a Highly Opaque Large-scale Galaxy Void at the End of Reionization 査読有り

    Daichi Kashino, Simon J. Lilly, Takatoshi Shibuya, Masami Ouchi, Nobunari Kashikawa

    The Astrophysical Journal     2019年12月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)  

    DOI: 10.3847/1538-4357/ab5a7d

  3. Disentangling the physical parameters of gaseous nebulae and galaxies 査読有り

    Daichi Kashino, Akio K Inoue

    Monthly Notices of the Royal Astronomical Society   486 巻 ( 1 ) 頁: 1053 - 1069   2019年6月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press ({OUP})  

    DOI: 10.1093/mnras/stz881

  4. The FMOS-COSMOS Survey of Star-forming Galaxies at z ∼ 1.6. VI. Redshift and Emission-line Catalog and Basic Properties of Star-forming Galaxies 査読有り

    Daichi Kashino, John D. Silverman, David Sanders, Jeyhan Kartaltepe, Emanuele Daddi, Alvio Renzini, Giulia Rodighiero, Annagrazia Puglisi, Francesco Valentino, Stéphanie Juneau, Nobuo Arimoto, Tohru Nagao, Olivier Ilbert, Olivier Le Fèvre, Anton M. Koekemoer

    The Astrophysical Journal Supplement Series   241 巻 ( 1 ) 頁: 10 - 10   2019年3月

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    担当区分:筆頭著者, 責任著者   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    DOI: 10.3847/1538-4365/ab06c4

  5. Predicted future fate of COSMOS galaxy protoclusters over 11 Gyr with constrained simulations

    Ata Metin, Lee Khee-Gan, Dalla Vecchia Claudio, Kitaura Francisco-Shu, Cucciati Olga, Lemaux Brian C., Kashino Daichi, Mueller Thomas

    NATURE ASTRONOMY     2022年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Nature Astronomy  

    Cosmological simulations are crucial tools in studying the Universe, but they typically do not directly match real observed structures. Constrained cosmological simulations, on the other hand, are designed to match the observed distribution of galaxies. Here we present constrained simulations based on spectroscopic surveys at a redshift of z ≈ 2.3, corresponding to an epoch of nearly 11 Gyr ago. This allows us to ‘fast-forward’ the simulation to our present day and study the evolution of observed cosmic structures self-consistently. We confirm that several previously reported protoclusters will evolve into massive galaxy clusters by our present epoch, including the ‘Hyperion’ structure that we predict will collapse into a giant filamentary supercluster spanning 100 Mpc. We also discover previously unknown protoclusters with lower final masses than are typically detectable by other methods that nearly double the number of known protoclusters within this volume. Constrained simulations, applied to future high-redshift datasets, represent a unique opportunity for studying early structure formation and matching galaxy properties between high and low redshifts.

    DOI: 10.1038/s41550-022-01693-0

    Web of Science

    Scopus

    その他リンク: https://www.nature.com/articles/s41550-022-01693-0

  6. The Stellar Mass versus Stellar Metallicity Relation of Star-forming Galaxies at 1.6 <= z <= 3.0 and Implications for the Evolution of the alpha-enhancement

    Kashino Daichi, Lilly Simon J., Renzini Alvio, Daddi Emanuele, Zamorani Giovanni, Silverman John D., Ilbert Olivier, Peng Ying-jie, Mainieri Vincenzo, Bardelli Sandro, Zucca Elena, Kartaltepe Jeyhan S., Sanders David B.

    ASTROPHYSICAL JOURNAL   925 巻 ( 1 )   2022年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal  

    We measure the relationship between stellar mass and stellar metallicity for 1336 star-forming galaxies at 1.6 ≤ z ≤ 3.0 using rest-frame far-ultraviolet spectra from the zCOSMOS-deep survey. High signal-to-noise ratio composite spectra containing stellar absorption features are fit with stellar population synthesis model spectra of a range of stellar metallicity. We find stellar metallicities, which mostly reflect instantaneous iron abundances, scaling as [Fe/H]=-(0.81±0.01)+(0.32+0.03)log(M∗/1010Mo˙) across the stellar mass range of 109 2 M ∗/M o˙ ≲2 1011. The instantaneous oxygen-to-iron ratio (α-enhancement) inferred using the gas-phase mass-metallicity relation is on average found to be O/Fe≈0.47, being higher than the local O/Fe≈0 . The observed changes in [O/Fe] and [Fe/H] are reproduced in simple gas-regulator models with steady star formation histories. Our models show that the [O/Fe] is determined almost entirely by the instantaneous specific star formation rate alone while being independent of the mass and the characteristic of the gas regulation. We also find that the locations of ∼1010 M ⊙ galaxies at z ∼2 in the [O/Fe]-metallicity planes are in remarkable agreement with the sequence of low-metallicity thick-disk stars in our own Galaxy. This manifests a beautiful concordance between the results of Galactic archeology and observations of high-redshift Milky Way progenitors. There remains, however, a question of how and when the old metal-rich, low α/Fe stars seen in the bulge had formed by z ∼2 because such a stellar population is not seen in our data and is difficult to explain in the context of our models.

    DOI: 10.3847/1538-4357/ac399e

    Web of Science

    Scopus

  7. COSMOS2020: A Panchromatic View of the Universe to z similar to 10 from Two Complementary Catalogs

    Weaver J. R., Kauffmann O. B., Ilbert O., McCracken H. J., Moneti A., Toft S., Brammer G., Shuntov M., Davidzon I, Hsieh B. C., Laigle C., Anastasiou A., Jespersen C. K., Vinther J., Capak P., Casey C. M., McPartland C. J. R., Milvang-Jensen B., Mobasher B., Sanders D. B., Zalesky L., Arnouts S., Aussel H., Dunlop J. S., Faisst A., Franx M., Furtak L. J., Fynbo J. P. U., Gould K. M. L., Greve T. R., Gwyn S., Kartaltepe J. S., Kashino D., Koekemoer A. M., Kokorev V, Le Fevre O., Lilly S., Masters D., Magdis G., Mehta V, Peng Y., Riechers D. A., Salvato M., Sawicki M., Scarlata C., Scoville N., Shirley R., Silverman J. D., Sneppen A., Smolcic V, Steinhardt C., Stern D., Tanaka M., Taniguchi Y., Teplitz H. I, Vaccari M., Wang W-H, Zamorani G.

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   258 巻 ( 1 ) 頁: 11 - 11   2022年1月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal, Supplement Series  

    The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This paper describes the collection, processing, and analysis of these new imaging data to produce a new reference photometric redshift catalog. Source detection and multiwavelength photometry are performed for 1.7 million sources across the 2 deg2 of the COSMOS field, ∼966,000 of which are measured with all available broadband data using both traditional aperture photometric methods and a new profile-fitting photometric extraction tool, The Farmer, which we have developed. A detailed comparison of the two resulting photometric catalogs is presented. Photometric redshifts are computed for all sources in each catalog utilizing two independent photometric redshift codes. Finally, a comparison is made between the performance of the photometric methodologies and of the redshift codes to demonstrate an exceptional degree of self-consistency in the resulting photometric redshifts. The i < 21 sources have subpercent photometric redshift accuracy and even the faintest sources at 25 < i < 27 reach a precision of 5%. Finally, these results are discussed in the context of previous, current, and future surveys in the COSMOS field. Compared to COSMOS2015, it reaches the same photometric redshift precision at almost one magnitude deeper. Both photometric catalogs and their photometric redshift solutions and physical parameters will be made available through the usual astronomical archive systems (ESO Phase 3, IPAC-IRSA, and CDS).

    DOI: 10.3847/1538-4365/ac3078

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  8. Multiple Mg ii Absorption Systems in the Lines of Sight to Quadruply Lensed Quasar H1413+1143

    Okoshi Katsuya, Minowa Yosuke, Kashikawa Nobunari, Misawa Toru, Kashino Daichi, Sugai Hajime, Matsubayashi Kazuya, Shimono Atsushi, Ozaki Shinobu

    ASTRONOMICAL JOURNAL   162 巻 ( 5 )   2021年11月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astronomical Journal  

    We find multiple Mg ii absorption systems at redshift z = 1.66, 2.069, and 2.097 in the spatially resolved spectra of the quadruply gravitationally lensed quasar H1413+1143 utilizing the Kyoto tridimensional spectrograph ii (Kyoto 3D ii) spectrograph on board the Subaru telescope. Here we present the first measurement of differences in Mg ii absorption strength of the multiple intervening absorbers, which include ones identified as damped Lya (DLA) absorption systems. Our detection of the significant Mg ii absorptions in the spatially resolved spectra reveals the inhomogeneous chemical enrichment on scales of about 12 kpc within the separation of the four sight lines. For the DLA system at z = 1.66, the rest equivalent widths (EWs) of the Mg ii absorption lines between the four spatially resolved lines of sight change by factors of up to ~6, which trace the variations in the H i absorption strength. This suggests that inhomogeneous cold absorbers that give rise to the strong H i/Mg ii absorptions dwell on a scale of about 6-12 kpc between the four lines of sight. We also investigate the degree of variation in the EW of the absorption lines between the lines of sight. We find that the systems giving rise to strong absorptions in the spectra of the quadruply lensed quasars tend to have a high degree of variation in absorption strength between the lines of sight toward the lensed quasars.

    DOI: 10.3847/1538-3881/ac0bbb

    Web of Science

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  9. BIRTH of the COSMOS field: primordial and evolved density reconstructions during cosmic high noon

    Metin Ata, Francisco-Shu Kitaura, Khee-Gan Lee, Brian C Lemaux, Daichi Kashino, Olga Cucciati, Mónica Hernández-Sánchez, Oliver Le Fèvre

    Monthly Notices of the Royal Astronomical Society     2020年12月

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    掲載種別:研究論文(学術雑誌)  

    DOI: 10.1093/mnras/staa3318

  10. An Observational Link between AGN Eddington Ratio and [N ii]λ6583/Hα at 0.6 < z < 1.7 査読有り

    Kyuseok Oh, Yoshihiro Ueda, Masayuki Akiyama, Hyewon Suh, Michael J. Koss, Daichi Kashino, Günther Hasinger

    The Astrophysical Journal   880 巻 ( 2 )   2019年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    We present an observed relationship between the Eddington ratio (lambda(Edd)) and the optical narrow-emission-line ratio ([N II]lambda 6583/H alpha) of X-ray-selected broad-line active galactic nuclei (AGNs) at 0.6 < z < 1.7. We use 27 near-infrared spectra from the Fiber Multi-Object Spectrograph along with 26 sources from the literature. We show that the lambda(Edd) and [N II]lambda 6583/H alpha ratio at 0.6 < z < 1.7 exhibits a similar anti-correlation distribution of lambda(Edd)-[N II]lambda 6583/H alpha, as has been found for local (< z > = 0.036), ultra-hard, X-ray-selected AGNs. The observed distribution implies that there is a consistent relationship from local to z similar to 1.7, which corresponds from the present time to 4 Gyr old. Further study of high-redshift, low-Eddington-ratio AGNs (log lambda(Edd) < -2) is necessary to determine fully whether the lambda(Edd)-[N II]lambda 6583/H alpha anti-correlation still holds in high-redshift AGNs at low Eddington ratios.

    DOI: 10.3847/1538-4357/ab288b

    Web of Science

  11. Horizon-AGN virtual observatory – 1. SED-fitting performance and forecasts for future imaging surveys 査読有り

    C Laigle, I Davidzon, O Ilbert, J Devriendt, D Kashino, C Pichon, P Capak, S Arnouts, S de la Torre, Y Dubois, G Gozaliasl, D Le Borgne, S Lilly, H J McCracken, M Salvato, A Slyz

    Monthly Notices of the Royal Astronomical Society   486 巻 ( 4 ) 頁: 5104 - 5123   2019年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press ({OUP})  

    DOI: 10.1093/mnras/stz1054

  12. An FMOS Survey of Moderate-luminosity, Broad-line AGNs in COSMOS, SXDS, and E-CDF-S 査読有り

    Andreas Schulze, John D. Silverman, Daichi Kashino, Masayuki Akiyama, Malte Schramm, Dave Sanders, Jeyhan Kartaltepe, Emanuele Daddi, Giulia Rodighiero, Alvio Renzini, Nobuo Arimoto, Tohru Nagao, Annagrazia Puglisi, Benny Trakhtenbrot, Francesca Civano, Hyewon Suh

    The Astrophysical Journal Supplement Series   239 巻 ( 2 ) 頁: 22 - 22   2018年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:American Astronomical Society  

    We present near-IR spectroscopy in the J- and H-bands for a large sample of 243 X-ray-selected, moderate-luminosity Type 1 active galactic nuclei (AGNs) in the COSMOS, SXDS, and E-CDF-S survey fields using the multi-object spectrograph Subaru/FMOS. Our sample covers the redshift range 0.5 less than or similar to z less than or similar to 3.0 and X-ray luminosity range of 10(43) less than or similar to L[2-10keV] less than or similar to 10(45) erg s(-1). We provide emission-line properties and derived virial black hole mass estimates, bolometric luminosities, and Eddington ratios, based on H alpha (211), H beta (63), and Mg II (4). We compare line widths, luminosities, and black hole mass estimates from H alpha and H beta, and augment these with commensurate measurements of Mg II and C IV detected in optical spectra. We demonstrate the robustness of using H alpha, H beta, and Mg II as reliable black hole mass estimators for high-z moderate-luminosity AGNs, while the use of C IV is prone to large uncertainties (greater than or similar to 0.4 dex). We extend a recently proposed correction based on the C IV blueshift to lower luminosities and black hole masses. While our sample shows an improvement in their C IV black hole mass estimates, the deficit of high blueshift sources reduces its overall importance for moderate-luminosity AGNs compared to the most luminous quasars. In addition, we revisit luminosity correlations between L-bol, L[2-10keV], L-[O III], L-5100, and L-H alpha and find them to be consistent with a simple empirical model, based on a small number of well-established scaling relations. Finally, we highlight our highest redshift AGN, CID 781, at z = 4.6, which has the lowest black hole mass (similar to 10(8) M-circle dot) among current near-IR samples at this redshift and is in a state of fast growth.

    DOI: 10.3847/1538-4365/aae82f

    Web of Science

  13. The ionization parameter of star-forming galaxies evolves with the specific star formation rate 査読有り

    Melanie Kaasinen, Lisa Kewley, Fuyan Bian, Brent Groves, Daichi Kashino, John Silverman, Jeyhan Kartaltepe

    Monthly Notices of the Royal Astronomical Society     2018年7月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press ({OUP})  

    DOI: 10.1093/mnras/sty1012

  14. Diversity of the Lyman continuum escape fractions of high-z galaxies and its origins 査読有り

    Sumida Takumi, Kashino Daichi, Hasegawa Kenji

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   475 巻 ( 3 ) 頁: 3870 - 3882   2018年4月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Monthly Notices of the Royal Astronomical Society  

    The Lyman continuum (LyC) escape fraction is a key quantity to determine the contribution of galaxies to cosmic reionization. It has been known that the escape fractions estimated by observations and numerical simulations show a large diversity. However, the origins of the diversity are still uncertain. In this work, to understand what quantities of galaxies are responsible for controlling the escape fraction, we numerically evaluate the escape fraction by performing ray-tracing calculation with simplified disc galaxy models. With a smooth disc model, we explore the dependence of the escape fraction on the disposition of ionizing sources and find that the escape fraction varies up to ~3 orders of magnitude. It is also found that the halo mass dependence of disc scale height determines whether the escape fraction increases or decreases with halo mass. With a clumpy disc model, it turns out that the escape fraction increases as the clump mass fraction increases because the density in the inter-clump region decreases. In addition, we find that clumpiness regulates the escape fraction via two ways when the total clump mass dominates the total gas mass; the escape fraction is controlled by the covering factor of clumps if the clumps are dense sufficient to block LyC photons, otherwise the clumpiness works to reduce the escape fraction by increasing the total number of recombination events in a galaxy.

    DOI: 10.1093/mnras/sty044

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  15. Predicting emission line fluxes and number counts of distant galaxies for cosmological surveys 査読有り

    F. Valentino, E. Daddi, J. D. Silverman, A. Puglisi, D. Kashino, A. Renzini, A. Cimatti, L. Pozzetti, G. Rodighiero, M. Pannella, R. Gobat, G. Zamorani

    Monthly Notices of the Royal Astronomical Society   472 巻 ( 4 ) 頁: 4878 - 4899   2017年12月

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    掲載種別:研究論文(学術雑誌)   出版者・発行元:Oxford University Press ({OUP})  

    DOI: 10.1093/mnras/stx2305

  16. The FMOS-COSMOS Survey of Star-forming Galaxies at Z similar to 1.6. V: Properties of Dark Matter Halos Containing Ha Emitting Galaxies 査読有り

    Kashino Daichi, More Surhud, Silverman John D., Daddi Emanuele, Renzini Alvio, Sanders David B., Rodighiero Giulia, Puglisi Annagrazia, Kajisawa Masaru, Valentino Francesco, Kartaltepe Jeyhan S., Le Fevre Olivier, Nagao Tohru, Arimoto Nobuo, Sugiyama Naoshi

    ASTROPHYSICAL JOURNAL   843 巻 ( 2 ) 頁: 138 - 138   2017年7月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal  

    We study the properties of dark matter halos that contain star-forming galaxies at 1.43 ≤ z ≤ 1.74, using the FMOS-COSMOS survey. The sample consists of 516 objects with a detection of the Hα emission line, which represent the star forming population at this epoch, having a stellar mass range of 109.57 ≤ M ∗/M o ≲ 1011.4 and a star-formation rate range of 15 ≲ SFR/(M o yr-1) ≲ 600. We measure the projected two-point correlation function while carefully taking into account observational biases, and find a significant clustering amplitude at scales of 0.04-10 h -1r0 = 5.26+0.750.62 h1 cMpc, with a correlation length and a bias b = 2.44 +0.38-0.32. We interpret our clustering measurement using a halo occupation distribution model. The sample galaxies appear to reside in halos with mass Mh = 4.71+1.19-1.62 × 1012 h-1 M oon average, which will likely become present-day halos of mass M h (z = 0) ∼ 2 ×1013 h -1 M o, equivalent to the typical halo mass scale of galaxy groups. We then confirm the decline of the stellar-to-halo mass ratio at M h < 1012 M o, finding M ∗/M h ≈ 5 ×10-3 at M h = 7. 5 ×1011 M o, which is lower by a factor of 2-4 than those measured at higher masses (M h ∼ 1012-13 M o). Finally, we use our results to illustrate the future capabilities of Subaru's Prime-Focus Spectrograph, a next-generation instrument that will provide strong constraints on the galaxy-formation scenario by obtaining precise measurements of galaxy clustering at z > 1.

    DOI: 10.3847/1538-4357/aa789d

    Web of Science

    Scopus

    arXiv

    その他リンク: http://stacks.iop.org/0004-637X/843/i=2/a=138?key=crossref.63b90b44945049b5a9788e0f31ad97ac

  17. The Bright and Dark Sides of High-redshift Starburst Galaxies from Herschel and Subaru Observations 査読有り 国際誌

    A. Puglisi, E. Daddi, A. Renzini, G. Rodighiero, J. D. Silverman, D. Kashino, L. Rodríguez-Muñoz, C. Mancini, V. Mainieri, A. Man, A. Franceschini, F. Valentino, A. Calabro, S. Jin, B. Darvish, C. Maier, J. S. Kartaltepe, D. B. Sanders

    Astrophysical Journal Letters   838 巻 ( 2 )   2017年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Institute of Physics Publishing  

    We present rest-frame optical spectra from the FMOS-COSMOS survey of 12 z ∼ 1.6 Herschel starburst galaxies, with star formation rate (SFR) elevated by ×8, on average, above the star-forming main sequence (MS). Comparing the Hα to IR luminosity ratio and the Balmer decrement, we find that the optically thin regions of the sources contain on average only ∼10% of the total SFR, whereas ∼90% come from an extremely obscured component that is revealed only by far-IR observations and is optically thick even in Hα. We measure the [N ii]6583/Hα ratio, suggesting that the less obscured regions have a metal content similar to that of the MS population at the same stellar masses and redshifts. However, our objects appear to be metal-rich outliers from the metallicity-SFR anticorrelation observed at fixed stellar mass for the MS population. The [S ii]6732/[S ii]6717 ratio from the average spectrum indicates an electron density n e ∼ 1100 cm-3 , larger than what was estimated for MS galaxies but only at the 1.5σ level. Our results provide supporting evidence that high-z MS outliers are analogous of local ULIRGs and are consistent with a major-merger origin for the starburst event.

    DOI: 10.3847/2041-8213/aa66c9

    Scopus

    arXiv

  18. THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z similar to 1.6. IV. EXCITATION STATE AND CHEMICAL ENRICHMENT OF THE INTERSTELLAR MEDIUM 査読有り

    Kashino D., Silverman J. D., Sanders D., Kartaltepe J. S., Daddi E., Renzini A., Valentino F., Rodighiero G., Juneau S., Kewley L. J., Zahid H. J., Arimoto N., Nagao T., Chu J., Sugiyama N., Civano F., Ilbert O., Kajisawa M., Le Fevre O., Maier C., Masters D., Miyaji T., Onodera M., Puglisi A., Taniguchi Y.

    ASTROPHYSICAL JOURNAL   835 巻 ( 1 ) 頁: 88 - 88   2017年1月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal  

    We investigate the physical conditions of ionized gas in high-z star-forming galaxies using diagnostic diagrams based on the rest-frame optical emission lines. The sample consists of 701 galaxies with an Hα detection at 1.4 ≲ z ≲ 1.7, from the Fiber Multi-Object Spectrograph (FMOS)-COSMOS survey, that represent the normal star-forming population over the stellar mass range 109.6 ≲ M∗/M⊙≲ 1011.6, with those at M∗ > 1011 being well sampled. We confirm an offset of the average location of star-forming galaxies in the Baldwin-Phillips-Terlevich (BPT) diagram ([O III]/Hβ versus, [N II]/Hα) primarily toward higher [O III], compared with local galaxies. Based on the [S ii] ratio, we measure an electron density (ne =220+170-130 cm-3), which is higher than that of local galaxies. Based on comparisons to theoretical models, we argue that changes in emission-line ratios, including the offset in the BPT diagram, are caused by a higher ionization parameter both at fixed stellar mass and at fixed metallicity, with additional contributions from a higher gas density and possibly a hardening of the ionizing radiation field. Ionization due to active galactic nuclei is ruled out as assessed with Chandra. As a consequence, we revisit the mass-metallicity relation [N II]/Hα using and a new calibration including [N II]/[S II]as recently introduced by Dopita et al. Consistent with our previous results, the most massive galaxies (M∗ ≳ 1011 M⊙) are fully enriched, while those at lower masses have metallicities lower than local galaxies. Finally, we demonstrate that the stellar masses, metallicities, and star formation rates of the FMOS sample are well fit with a physically motivated model for the chemical evolution of star-forming galaxies.

    DOI: 10.3847/1538-4357/835/1/88

    Web of Science

    Scopus

    arXiv

  19. HIDE-AND-SEEK WITH THE FUNDAMENTAL METALLICITY RELATION 査読有り

    Kashino D., Renzini A., Silverman J. D., Daddi E.

    ASTROPHYSICAL JOURNAL LETTERS   823 巻 ( 2 ) 頁: L24 - L24   2016年6月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal Letters  

    We use ∼83,000 star-forming galaxies at 0.04 < z < 0.3 from the Sloan Digital Sky Survey to study the so-called fundamental metallicity relation (FMR) and report on the disappearance of its anti-correlation between metallicity and star formation rate (SFR) when using the new metallicity indicator recently proposed by Dopita et al. In this calibration, metallicity is primarily sensitive to the emission line ratio [N ii]λ6584/[S ii]λλ 6717, 6731 that is insensitive to dilution by pristine infalling gas that may drive the FMR anti-correlation with SFR. Therefore, we conclude that the apparent disappearance of the FMR (using this new metallicity indicator) does not rule out its existence.

    DOI: 10.3847/2041-8205/823/2/L24

    Web of Science

    Scopus

    arXiv

    その他リンク: https://iopscience.iop.org/article/10.3847/2041-8205/823/2/L24

  20. A HIGHER EFFICIENCY OF CONVERTING GAS TO STARS PUSHES GALAXIES AT z similar to 1.6 WELL ABOVE THE STAR-FORMING MAIN SEQUENCE 査読有り

    Silverman J. D., Daddi E., Rodighiero G., Rujopakarn W., Sargent M., Renzini A., Liu D., Feruglio C., Kashino D., Sanders D., Kartaltepe J., Nagao T., Arimoto N., Berta S., Bethermin M., Koekemoer A., Lutz D., Magdis G., Mancini C., Onodera M., Zamorani G.

    ASTROPHYSICAL JOURNAL LETTERS   812 巻 ( 2 )   2015年10月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal Letters  

    Local starbursts have a higher efficiency of converting gas into stars, as compared to typical star-forming galaxies at a given stellar mass, possibly indicative of different modes of star formation. With the peak epoch of galaxy formation occurring at z > 1, it remains to be established whether such an efficient mode of star formation is occurring at high redshift. To address this issue, we measure the molecular gas content of seven high-redshift (z ∼ 1.6) starburst galaxies with the Atacama Large Millimeter/submillimeter Array and IRAM/Plateau de Bure Interferometer. Our targets are selected from the sample of Herschel far-infrared-detected galaxies having star formation rates (∼300-800 Mo yr-1) elevated (4�) above the star-forming main sequence (MS) and included in the FMOS-COSMOS near-infrared spectroscopic survey of star-forming galaxies at z ∼ 1.6 with Subaru. We detect CO emission in all cases at high levels of significance, indicative of high gas fractions (∼30%-50%). Even more compelling, we firmly establish with a clean and systematic selection that starbursts, identified as MS outliers, at high redshift generally have a lower ratio of CO to total infrared luminosity as compared to typical MS star-forming galaxies, although with a smaller offset than expected based on past studies of local starbursts. We put forward a hypothesis that there exists a continuous increase in star formation efficiency with elevation from the MS with galaxy mergers as a possible physical driver. Along with a heightened star formation efficiency, our high-redshift sample is similar in other respects to local starbursts, such as being metal rich and having a higher ionization state of the interstellar medium.

    DOI: 10.1088/2041-8205/812/2/L23

    Web of Science

    Scopus

    arXiv

  21. THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z similar to 1.6. III. SURVEY DESIGN, PERFORMANCE, AND SAMPLE CHARACTERISTICS 査読有り

    Silverman J. D., Kashino D., Sanders D., Kartaltepe J. S., Arimoto N., Renzini A., Rodighiero G., Daddi E., Zahid J., Nagao T., Kewley L. J., Lilly S. J., Sugiyama N., Baronchelli I., Capak P., Carollo C. M., Chu J., Hasinger G., Ilbert O., Juneau S., Kajisawa M., Koekemoer A. M., Kovac K., Le Fevre O., Masters D., McCracken H. J., Onodera M., Schulze A., Scoville N., Strazzullo V., Taniguchi Y.

    ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES   220 巻 ( 1 )   2015年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal, Supplement Series  

    We present a spectroscopic survey of galaxies in the COSMOS field using the Fiber Multi-object Spectrograph (FMOS), a near-infrared instrument on the Subaru Telescope. Our survey is specifically designed to detect the Hα emission line that falls within the H-band (1.6-1.8 μm) spectroscopic window from star-forming galaxies with 1.4 < z < 1.7 and Mstellar 1010 Mo. With the high multiplex capability of FMOS, it is now feasible to construct samples of over 1000 galaxies having spectroscopic redshifts at epochs that were previously challenging. The high-resolution mode (R ∼ 2600) effectively separates Hα and [N ii]λ6585, thus enabling studies of the gas-phase metallicity and photoionization state of the interstellar medium. The primary aim of our program is to establish how star formation depends on stellar mass and environment, both recognized as drivers of galaxy evolution at lower redshifts. In addition to the main galaxy sample, our target selection places priority on those detected in the far-infrared by Herschel/PACS to assess the level of obscured star formation and investigate, in detail, outliers from the star formation rate (SFR) - stellar mass relation. Galaxies with Hα detections are followed up with FMOS observations at shorter wavelengths using the J-long (1.11-1.35 μm) grating to detect Hβ and [O iii]λ5008 which provides an assessment of the extinction required to measure SFRs not hampered by dust, and an indication of embedded active galactic nuclei. With 460 redshifts measured from 1153 spectra, we assess the performance of the instrument with respect to achieving our goals, discuss inherent biases in the sample, and detail the emission-line properties. Our higher-level data products, including catalogs and spectra, are available to the community.

    DOI: 10.1088/0067-0049/220/1/12

    Web of Science

    Scopus

    arXiv

  22. REST-FRAME OPTICAL EMISSION LINES IN FAR-INFRARED-SELECTED GALAXIES AT z < 1.7 FROM THE FMOS-COSMOS SURVEY 査読有り

    Kartaltepe Jeyhan S., Sanders D. B., Silverman J. D., Kashino D., Chu J., Zahid H., Hasinger G., Kewley L., Matsuoka K., Nagao T., Riguccini L., Salvato M., Schawinski K., Taniguchi Y., Treister E., Capak P., Daddi E., Ohta K.

    ASTROPHYSICAL JOURNAL LETTERS   806 巻 ( 2 )   2015年6月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal Letters  

    We have used FMOS on Subaru to obtain near-infrared spectroscopy of 123 far-infrared-selected galaxies in COSMOS and the key rest-frame optical emission lines. This is the largest sample of infrared galaxies with near-infrared spectroscopy at these redshifts. The far-infrared selection results in a sample of galaxies that are massive systems that span a range of metallicities in comparison with previous optically selected surveys, and thus has a higher active galactic nucleus (AGN) fraction and better samples the AGN branch. We establish the presence of AGNs and starbursts in this sample of (U)LIRGs selected as Herschel-PACS and Spitzer-MIPS detections in two redshift bins (z ∼ 0.7 and z ∼ 1.5) and test the redshift dependence of diagnostics used to separate AGNs from star formation dominated galaxies. In addition, we construct a low-redshift (z ∼ 0.1) comparison sample of infrared-selected galaxies and find that the evolution from z ∼ 1.5 to today is consistent with an evolving AGN selection line and a range of ISM conditions and metallicities from the models of Kewley et al. We find that a large fraction of (U)LIRGs are BPT-selected AGNs using their new redshift-dependent classification line. We compare the position of known X-ray-detected AGNs (67 in total) with the BPT selection and find that the new classification line accurately selects most of these objects (> 70%). Furthermore, we identify 35 new (likely obscured) AGNs not selected as such by their X-ray emission. Our results have direct implications for AGN selection at higher redshift with either current (MOSFIRE, KMOS) or future (PFS, MOONS) spectroscopic efforts with near-infrared spectral coverage.

    DOI: 10.1088/2041-8205/806/2/L35

    Web of Science

    Scopus

    arXiv

  23. A multiwavelength consensus on the main sequence of star-forming galaxies at z similar to 2 査読有り

    Rodighiero G., Renzini A., Daddi E., Baronchelli I., Berta S., Cresci G., Franceschini A., Gruppioni C., Lutz D., Mancini C., Santini P., Zamorani G., Silverman J., Kashino D., Andreani P., Cimatti A., Dominguez Sanchez H., Le Floch E., Magnelli B., Popesso P., Pozzi F.

    MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY   443 巻 ( 1 ) 頁: 19 - 30   2014年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Monthly Notices of the Royal Astronomical Society  

    We compare various star formation rate (SFR) indicators for star-forming galaxies at 1.4 < z < 2.5 in the COSMOS field. The main focus is on the SFRs from the far-IR (PACSHerschel data) with those from the ultraviolet, for galaxies selected according to the BzK criterion. FIR-selected samples lead to a vastly different slope of the SFR-stellar mass (M*) relation, compared to that of the dominant main-sequence population as measured from the UV, since the FIR selection picks predominantly only a minority of outliers. However, there is overall agreement between the main sequences derived with the two SFR indicators, when stacking on the PACS maps the BzK-selected galaxies. The resulting logarithmic slope of the SFR-M* relation is ~0.8-0.9, in agreement with that derived from the dust-corrected UV luminosity. Exploiting deeper 24 μm Spitzer data, we have characterized a subsample of galaxies with reddening and SFRs poorly constrained, as they are very faint in the B band. The combination of Herschel with Spitzer data has allowed us to largely break the age/reddening degeneracy for these intriguing sources, by distinguishing whether a galaxy is very red in B-z because of being heavily dust reddened, or whether because star formation has been (or is being) quenched. Finally, we have compared our SFR(UV) to the SFRs derived by stacking the radio data and to those derived from the Hα luminosity of a sample of star-forming galaxies at 1.4 < z<1.7. The two sets of SFRs are broadly consistent as they are with the SFRs derived from the UV and by stacking the corresponding PACS data in various mass bins. © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society.

    DOI: 10.1093/mnras/stu1110

    Web of Science

    Scopus

    arXiv

  24. THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z similar to 1.6. II. THE MASS-METALLICITY RELATION AND THE DEPENDENCE ON STAR FORMATION RATE AND DUST EXTINCTION 査読有り

    Zahid H. J., Kashino D., Silverman J. D., Kewley L. J., Daddi E., Renzini A., Rodighiero G., Nagao T., Arimoto N., Sanders D. B., Kartaltepe J., Lilly S. J., Maier C., Geller M. J., Capak P., Carollo C. M., Chu J., Hasinger G., Ilbert O., Kajisawa M., Koekemoer A. M., Kovac K., Le Fevre O., Masters D., McCracken H. J., Onodera M., Scoville N., Strazzullo V., Sugiyama N., Taniguchi Y.

    ASTROPHYSICAL JOURNAL   792 巻 ( 1 )   2014年9月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal  

    We investigate the relationships between stellar mass, gas-phase oxygen abundance (metallicity), star formation rate (SFR), and dust content of star-forming galaxies at z 1.6 using Subaru/FMOS spectroscopy in the COSMOS field. The mass-metallicity (MZ) relation at z 1.6 is steeper than the relation observed in the local universe. The steeper MZ relation at z 1.6 is mainly due to evolution in the stellar mass where the MZ relation begins to turnover and flatten. This turnover mass is 1.2 dex larger at z 1.6. The most massive galaxies at z 1.6 (1011 M) are enriched to the level observed in massive galaxies in the local universe. The MZ relation we measure at z 1.6 supports the suggestion of an empirical upper metallicity limit that does not significantly evolve with redshift. We find an anti-correlation between metallicity and SFR for galaxies at a fixed stellar mass at z 1.6, which is similar to trends observed in the local universe. We do not find a relation between stellar mass, metallicity, and SFR that is independent of redshift; rather, our data suggest that there is redshift evolution in this relation. We examine the relation between stellar mass, metallicity, and dust extinction, and find that at a fixed stellar mass, dustier galaxies tend to be more metal rich. From examination of the stellar masses, metallicities, SFRs, and dust extinctions, we conclude that stellar mass is most closely related to dust extinction. © 2014. The American Astronomical Society. All rights reserved..

    DOI: 10.1088/0004-637X/792/1/75

    Web of Science

    Scopus

    arXiv

  25. THE UNIVERSAL RELATION OF GALACTIC CHEMICAL EVOLUTION: THE ORIGIN OF THE MASS-METALLICITY RELATION 査読有り

    Zahid H. Jabran, Dima Gabriel I., Kudritzki Rolf-Peter, Kewley Lisa J., Geller Margaret J., Hwang Ho Seong, Silverman John D., Kashino Daichi

    ASTROPHYSICAL JOURNAL   791 巻 ( 2 ) 頁: 130 - 130   2014年8月

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    記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal  

    We examine the mass-metallicity relation for z ≲ 1.6. The mass-metallicity relation follows a steep slope with a turnover, or "knee," at stellar masses around 1010 M ⊙. At stellar masses higher than the characteristic turnover mass, the mass-metallicity relation flattens as metallicities begin to saturate. We show that the redshift evolution of the mass-metallicity relation depends only on the evolution of the characteristic turnover mass. The relationship between metallicity and the stellar mass normalized to the characteristic turnover mass is independent of redshift. We find that the redshift-independent slope of the mass-metallicity relation is set by the slope of the relationship between gas mass and stellar mass. The turnover in the mass-metallicity relation occurs when the gas-phase oxygen abundance is high enough that the amount of oxygen locked up in low-mass stars is an appreciable fraction of the amount of oxygen produced by massive stars. The characteristic turnover mass is the stellar mass, where the stellar-to-gas mass ratio is unity. Numerical modeling suggests that the relationship between metallicity and the stellar-to-gas mass ratio is a redshift-independent, universal relationship followed by all galaxies as they evolve. The mass-metallicity relation originates from this more fundamental universal relationship between metallicity and the stellar-to-gas mass ratio. We test the validity of this universal metallicity relation in local galaxies where stellar mass, metallicity, and gas mass measurements are available. The data are consistent with a universal metallicity relation. We derive an equation for estimating the hydrogen gas mass from measurements of stellar mass and metallicity valid for z ≲ 1.6 and predict the cosmological evolution of galactic gas masses. © 2014. The American Astronomical Society. All rights reserved..

    DOI: 10.1088/0004-637X/791/2/130

    Web of Science

    Scopus

    arXiv

    その他リンク: http://stacks.iop.org/0004-637X/791/i=2/a=130?key=crossref.469535d9e522271c7e92558b0851f311

  26. THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z similar to 1.6. I. H alpha-BASED STAR FORMATION RATES AND DUST EXTINCTION (vol 777, Pg L8, 2013)

    Kashino D., Silverman J. D., Rodighiero G., Renzini A., Arimoto N., Daddi E., Lilly S. J., Sanders D. B., Kartaltepe J., Zahid H. J., Nagao T., Sugiyama N., Capak P., Carollo C. M., Chu J., Hasinger G., Ilbert O., Kajisawa M., Kewley L. J., Koekemoer A. M., Kovac K., Le Fevre O., Masters D., McCracken H. J., Onodera M., Scoville N., Strazzullo V., Symeonidis M., Taniguchi Y.

    ASTROPHYSICAL JOURNAL LETTERS   785 巻 ( 2 )   2014年4月

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    出版者・発行元:Astrophysical Journal Letters  

    DOI: 10.1088/2041-8205/785/2/L37

    Web of Science

    Scopus

  27. THE FMOS-COSMOS SURVEY OF STAR-FORMING GALAXIES AT z similar to 1.6. I. H alpha-BASED STAR FORMATION RATES AND DUST EXTINCTION 査読有り

    Kashino D., Silverman J. D., Rodighiero G., Renzini A., Arimoto N., Daddi E., Lilly S. J., Sanders D. B., Kartaltepe J., Zahid H. J., Nagao T., Sugiyama N., Capak P., Carollo C. M., Chu J., Hasinger G., Ilbert O., Kajisawa M., Kewley L. J., Koekemoer A. M., Kovac K., Le Fevre O., Masters D., McCracken H. J., Onodera M., Scoville N., Strazzullo V., Symeonidis M., Taniguchi Y.

    ASTROPHYSICAL JOURNAL LETTERS   777 巻 ( 1 ) 頁: L8 - L8   2013年11月

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    担当区分:筆頭著者, 責任著者   記述言語:日本語   掲載種別:研究論文(学術雑誌)   出版者・発行元:Astrophysical Journal Letters  

    We present the first results from a near-IR spectroscopic survey of the COSMOS field, using the Fiber Multi-Object Spectrograph on the Subaru telescope, designed to characterize the star-forming galaxy population at 1.4 < z < 1.7. The high-resolution mode is implemented to detect Hα in emission between 1.6-1.8 μm with fHα ≳ 4 × 10 -17 erg cm-2 s-1. Here, we specifically focus on 271 sBzK-selected galaxies that yield a Hα detection thus providing a redshift and emission line luminosity to establish the relation between star formation rate and stellar mass. With further J-band spectroscopy for 89 of these, the level of dust extinction is assessed by measuring the Balmer decrement using co-added spectra. We find that the extinction (0.6 ≲ A Hα ≲ 2.5) rises with stellar mass and is elevated at high masses compared to low-redshift galaxies. Using this subset of the spectroscopic sample, we further find that the differential extinction between stellar and nebular emission Estar (B-V)/Eneb(B-V) is 0.7-0.8, dissimilar to that typically seen at low redshift. After correcting for extinction, we derive an Hα-based main sequence with a slope (0.81 ± 0.04) and normalization similar to previous studies at these redshifts. © 2013. The American Astronomical Society. All rights reserved.

    DOI: 10.1088/2041-8205/777/1/L8

    Web of Science

    Scopus

    arXiv

    その他リンク: https://iopscience.iop.org/article/10.1088/2041-8205/777/1/L8

▼全件表示

講演・口頭発表等 9

  1. The ISM properties of extreme emission-line galaxies at z~0.8 国際共著

    柏野大地

    金属欠乏宇宙2021  2021年9月28日 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  2. The ISM properties of extreme emission-line galaxies at z~0.8 国際共著

    柏野大地

    金属欠乏宇宙2021  2021年9月28日 

     詳細を見る

    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  3. Exploring chemical evolution of star-forming galaxies at cosmic noon 国際共著

    2021年9月14日 

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    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  4. Exploring chemical evolution of star-forming galaxies at cosmic noon 国際共著

    2021年9月14日 

     詳細を見る

    開催年月日: 2021年9月

    記述言語:日本語   会議種別:口頭発表(一般)  

    国名:日本国  

  5. Exploring the tail end of reionization with deep HSC surveys 国際会議

    Daichi Kashino

    Subaru Users Meeting FY2020  2021年3月5日 

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    開催年月日: 2021年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  6. Exploring the tail end of reionization with deep HSC surveys 国際会議

    Daichi Kashino

    Subaru Users Meeting FY2020  2021年3月5日 

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    開催年月日: 2021年3月

    記述言語:英語   会議種別:口頭発表(一般)  

    国名:日本国  

  7. THE 2175Å DUST FEATURE IN STAR-FORMING GALAXIES AT 1.3≤Z≤1.8 国際会議

    Daichi Kashino

    The Rise of Metals and Dust in Galaxies through Cosmic Time  2020年10月30日 

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    開催年月日: 2020年10月

    記述言語:英語   会議種別:ポスター発表  

    国名:フランス共和国  

  8. THE 2175Å DUST FEATURE IN STAR-FORMING GALAXIES AT 1.3≤Z≤1.8 国際会議

    Daichi Kashino

    The Rise of Metals and Dust in Galaxies through Cosmic Time  2020年10月30日 

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    開催年月日: 2020年10月

    記述言語:英語   会議種別:ポスター発表  

    国名:フランス共和国  

  9. Exploring the tail end of cosmic reionization with Subaru/HSC 国際会議

    Daichi Kashino

    The Subaru telescope 20th Anniversary  2019年11月19日 

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    開催年月日: 2019年11月

    記述言語:英語   会議種別:口頭発表(一般)  

▼全件表示

科研費 2

  1. 宇宙再電離と宇宙初期の銀河進化の解明

    研究課題/研究課題番号:21K13956  2021年4月 - 2025年3月

    日本学術振興会  科学研究費助成事業  若手研究

    柏野 大地

      詳細を見る

    担当区分:研究代表者 

    配分額:4550000円 ( 直接経費:3500000円 、 間接経費:1050000円 )

    本研究の目的は「宇宙再電離」過程の解明である。宇宙再電離とは、それまで宇宙を満たしていた中性水素を主成分とするガスが、宇宙初期に形成された天体の放射によって電離される現象であり、現代天文学・宇宙論研究の最大のテーマの一つである。本研究では国立天文台すばる望遠鏡・欧州天文台 VLT・次世代宇宙望遠鏡 JWST などの大型望遠鏡を用いて観測を行い、再電離の理論モデルの検証や再電離期の銀河の性質や再電離における役割、銀河間ガスと銀河の相互作用の包括的な理解を目指す。

  2. 近赤外分光観測と計算機シミュレーションで探る銀河の形成と進化

    研究課題/研究課題番号:14J03216  2014年4月 - 2017年3月

    日本学術振興会  科学研究費助成事業 特別研究員奨励費  特別研究員奨励費

    柏野 大地

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    平成28年度は、すばる望遠鏡近赤外線多天体分光装置FMOSで観測した約1100個の遠方星形成銀河のスペクトルデータを用いて、(1) 星間ガスの性質の解明と (2) 銀河のクラスタリング(集団化)の統計的性質を調べた。研究 (1) では高赤方偏移銀河の星間電離ガスが、近傍銀河に比べて、高いレベルで電離・励起されていることを明らかにし、これらの成果をまとめた論文は既にAstrophysical Journal (ApJ) 誌において出版済み(Kashino et al. 2017, ApJ, 835, 88) である。研究 (2) では、銀河を内包するハロー質量に新たな制限をつけ、銀河進化モデルを制限する手掛かりを得た。成果をまとめた論文はApJに投稿し、2017年4月現在査読中である。また、当研究代表者はこれらの成果を博士論文「The Physical Properties of Star-forming Galaxies and Their Environments at Intermediate Redshifts」(名古屋大学) として2016年8月に提出し博士(理学)を取得した。
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    また、関連する研究としてスローンデジタルスカイサーベイの銀河カタログを用いて、近傍銀河の金属量進化と星質量、星形成率の関係について研究を行った。これらの成果はAstrophysical Journal Letter 誌において出版済みである (Kashino et al. 2016, ApJL, 823, L24)。また、年度中から現在まで、FMOSにより得られた全ての観測データ(5500個の銀河のスペクトルデータ)のデータベースを構築を行っている。
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    尚、当研究代表者は2016年10月から海外の研究機関で博士研究員として採用されたため、2016年9月末をもって特別研究員を辞退した。

 

社会貢献活動 1

  1. 第86回名大カフェ「ジェームズ・ウェッブ宇宙望遠鏡で覗く銀河宇宙の黎明」

    役割:出演

    Common-S.サカエ大学(運営:松坂屋名古屋店)/名古屋大学 学術研究・産学官連携推進本部  第86回名大カフェ"Science, and Me "  オンライン (youtube)  2022年4月

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    対象: 小学生, 中学生, 高校生, 大学生, 大学院生, 教育関係者, 保護者, 研究者, 社会人・一般, 学術団体, 企業

    Youtube: https://youtu.be/wHkASsWq_hE

メディア報道 1

  1. すばる望遠鏡、100億年前の銀河で星々が形成されている様子の観察に成功 インターネットメディア

    マイナビニュース  マイナビニュース  https://news.livedoor.com/article/detail/8330378/?escode=wakuwaku  2013年12月

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    執筆者:本人