研究者詳細 - 立原　研悟

論文 - 立原　研悟

分割表示 177 件中 81 - 100 件目／全件表示 >>

A centrally concentrated sub-solar-mass starless core in the Taurus L1495 filamentary complex 査読有り Open Access

Tokuda, K; Tachihara, K; Saigo, K; André, P; Miyamoto, Y; Zahorecz, S; Inutsuka, S; Matsumoto, T; Takashima, T; Machida, MN; Tomida, K; Taniguchi, K; Fukui, Y; Kawamura, A; Tatematsu, K; Kandori, R; Onishi, T

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 71 巻 ( 4 ) 2019年8月

Gas and Dust Properties in the Chamaeleon Molecular Cloud Complex Based on the Optically Thick HI 査読有り Open Access

Hayashi, K; Okamoto, R; Yamamoto, H; Hayakawa, T; Tachihara, K; Fukui, Y

ASTROPHYSICAL JOURNAL 878 巻 ( 2 ) 2019年6月

Unveiling Molecular Clouds toward Bipolar H II Region G8.14+0.23 査読有り Open Access

Dewangan, LK; Sano, H; Enokiya, R; Tachihara, K; Fukui, Y; Ojha, DK

ASTROPHYSICAL JOURNAL 878 巻 ( 1 ) 2019年6月

記述言語：日本語掲載種別：研究論文（学術雑誌）

Most recent numerical simulations suggest that bipolar HII regions, powered 
by O-type stars, can be formed at the interface of two colliding clouds. To 
observationally understand the birth of O-type stars, we present a detailed 
multi-wavelength analysis of an area of 1 deg x 1 deg hosting G8.14+0.23 HII 
region associated with an infrared bipolar nebula (BPN). Based on the radio 
continuum map, the HII region is excited by at least an O-type star, which is 
located toward the waist of the BPN. The NANTEN2 13CO line data reveal the 
existence of two extended clouds at [9, 14.3] and [15.3, 23.3] km/s toward the 
site G8.14+0.23, which are connected in the position-velocity space through a 
broad-bridge feature at the intermediate velocity range. A 
"cavity/intensity-depression" feature is evident in the blueshifted cloud, and 
is spatially matched by the "elongated redshifted cloud". The spatial and 
velocity connections of the clouds suggest their interaction in the site 
G8.14+0.23. The analysis of deep near-infrared photometric data reveals the 
presence of clusters of infrared-excess sources, illustrating ongoing star 
formation activities in both the clouds. The O-type star is part of the 
embedded cluster seen in the waist of the BPN, which is observed toward the 
spatial matching zone of the cavity and the redshifted cloud. The observational 
results appear to be in reasonable agreement with the numerical simulations of 
cloud-cloud collision (CCC), suggesting that the CCC process seems to be 
responsible for the birth of the O-type star in G8.14+0.23.

DOI： 10.3847/1538-4357/ab1cba

Web of Science

arXiv

Possible Evidence for Cosmic-Ray Acceleration in the Type Ia SNR RCW 86: Spatial Correlation between TeV Gamma-Rays and Interstellar Atomic Protons 査読有り Open Access

Sano, H; Rowell, G; Reynoso, EM; Jung-Richardt, I; Yamane, Y; Nagaya, T; Yoshiike, S; Hayashi, K; Torii, K; Maxted, N; Mitsuishi, I; Inoue, T; Inutsuka, S; Yamamoto, H; Tachihara, K; Fukui, Y

ASTROPHYSICAL JOURNAL 876 巻 ( 1 ) 頁： 37 - 37 2019年5月

Formation of high-mass stars in an isolated environment in the Large Magellanic Cloud 査読有り Open Access

Harada, R; Onishi, T; Tokuda, K; Zahorecz, S; Hughes, A; Meixner, M; Sewilo, M; Indebetouw, R; Nayak, O; Fukui, Y; Tachihara, K; Tsuge, K; Kawamura, A; Saigo, K; Wong, T; Bernard, JP; Stephens, IW

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 71 巻 ( 2 ) 2019年4月

ALMA CO Observations of Supernova Remnant N63A in the Large Magellanic Cloud: Discovery of Dense Molecular Clouds Embedded within Shock-ionized and Photoionized Nebulae 査読有り Open Access

Sano, H; Matsumura, H; Nagaya, T; Yamane, Y; Alsaberi, RZE; Filipovic, MD; Tachihara, K; Fujii, K; Tokuda, K; Tsuge, K; Yoshiike, S; Onishi, T; Kawamura, A; Minamidani, T; Mizuno, N; Yamamoto, H; Inutsuka, S; Inoue, T; Maxted, N; Rowell, G; Sasaki, M; Fukui, Y

ASTROPHYSICAL JOURNAL 873 巻 ( 1 ) 2019年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

We carried out new $^{12}$CO($J$ = 1-0, 3-2) observations of a N63A supernova 
remnant (SNR) from the LMC using ALMA and ASTE. We find three giant molecular 
clouds toward the northeast, east, and near the center of the SNR. Using the 
ALMA data, we spatially resolved clumpy molecular clouds embedded within the 
optical nebulae in both the shock-ionized and photoionized lobes discovered by 
previous H$\alpha$ and [S II] observations. The total mass of the molecular 
clouds is $\sim$$800$ $M_{\odot}$ for the shock-ionized region and $\sim$$1700$ 
$M_{\odot}$ for the photoionized region. Spatially resolved X-ray spectroscopy 
reveals that the absorbing column densities toward the molecular clouds are 
$\sim$$1.5$-$6.0\times10^{21}$ cm$^{-2}$, which are $\sim$$1.5$-$15$ times less 
than the averaged interstellar proton column densities for each region. This 
means that the X-rays are produced not only behind the molecular clouds, but 
also in front of them. We conclude that the dense molecular clouds have been 
completely engulfed by the shock waves, but have still survived erosion owing 
to their high-density and short interacting time. The X-ray spectrum toward the 
gas clumps is well explained by an absorbed power-law or high-temperature 
plasma models in addition to the thermal plasma components, implying that the 
shock-cloud interaction is efficiently working for both the cases through the 
shock ionization and magnetic field amplification. If the hadronic gamma-ray is 
dominant in the GeV band, the total energy of cosmic-ray protons is calculated 
to be $\sim$$0.3$-$1.4\times10^{49}$ erg with the estimated ISM proton density 
of $\sim$$190\pm90$ cm$^{-3}$, containing both the shock-ionized gas and 
neutral atomic hydrogen.

DOI： 10.3847/1538-4357/ab02fd

Open Access

Web of Science

arXiv

FUGIN: Molecular Gas in Spitzer Bubble N4-Possible Evidence for a Cloud-Cloud Collision as a Trigger of Massive Star Formations 査読有り Open Access

Fujita, S; Torii, K; Tachihara, K; Enokiya, R; Hayashi, K; Kuno, N; Kohno, M; Yamagishi, M; Nishimura, A; Umemoto, T; Minamida, T; Matsuo, M; Tsuda, Y; Sano, H; Tsutsumi, D; Oham, A; Yoshiike, S; Okawa, A; Fukui, Y

ASTROPHYSICAL JOURNAL 872 巻 ( 1 ) 2019年2月

Formation of the Active Star-forming Region LHA 120-N 44 Triggered by Tidally Driven Colliding HI Flows 査読有り Open Access

Tsuge, K; Sano, H; Tachihara, K; Yozin, C; Bekki, K; Inoue, T; Mizuno, N; Kawamura, A; Onishi, T; Fukui, Y

ASTROPHYSICAL JOURNAL 871 巻 ( 1 ) 2019年1月

Molecular Clouds Associated with the Type Ia SNR N103B in the Large Magellanic Cloud 査読有り Open Access

Sano, H; Yamane, Y; Tokuda, K; Fujii, K; Tsuge, K; Nagaya, T; Yoshiike, S; Filipovic, MD; Alsaberi, RZE; Barnes, L; Onishi, T; Kawamura, A; Minamidani, T; Mizuno, N; Yamamoto, H; Tachihara, K; Maxted, N; Voisin, F; Rowell, G; Yamaguchi, H; Fukui, Y

ASTROPHYSICAL JOURNAL 867 巻 ( 1 ) 2018年11月

Molecular filament formation and filament-cloud interaction: Hints from Nobeyama 45 m telescope observations Open Access

Arzoumanian, D; Shimajiri, Y; Inutsuka, S; Inoue, T; Tachihara, K

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( 5 ) 2018年10月

Discovery of Molecular and Atomic Clouds Associated with the Gamma-Ray Supernova Remnant Kesteven 79 査読有り Open Access

Kuriki, M; Sano, H; Kuno, N; Seta, M; Yamane, Y; Inaba, T; Nagaya, T; Yoshiike, S; Okawa, K; Tsutsumi, D; Hattori, Y; Kohno, M; Fujita, S; Nishimura, A; Ohama, A; Matsuo, M; Tsuda, Y; Torii, K; Minamidani, T; Umemoto, T; Rowell, G; Bamba, A; Tachihara, K; Fukui, Y

ASTROPHYSICAL JOURNAL 864 巻 ( 2 ) 2018年9月

ALMA Observations of Supernova Remnant N49 in the LMC. I. Discovery of CO Clumps Associated with X-Ray and Radio Continuum Shells 査読有り Open Access

Yamane, Y; Sano, H; van Loon, JT; Filipovic, MD; Fujii, K; Tokuda, K; Tsuge, K; Nagaya, T; Yoshiike, S; Grieve, K; Voisin, F; Rowell, G; Indebetouw, R; Lakicevic, M; Temim, T; Staveley-Smith, L; Rho, J; Long, KS; Park, S; Seok, J; Mizuno, N; Kawamura, A; Onishi, T; Inoue, T; Inutsuka, S; Tachihara, K; Fukui, Y

ASTROPHYSICAL JOURNAL 863 巻 ( 1 ) 2018年8月

Warm CO Gas Generated by Possible Turbulent Shocks in a Low-mass Star-forming Dense Core in Taurus 査読有り Open Access

Tokuda, K; Onishi, T; Saigo, K; Matsumoto, T; Inoue, T; Inutsuka, S; Fukui, Y; Machida, MN; Tomida, K; Hosokawa, T; Kawamura, A; Tachihara, K

ASTROPHYSICAL JOURNAL 862 巻 ( 1 ) 2018年7月

Synthetic Observations of 21 cm H I Line Profiles from Inhomogeneous Turbulent Interstellar H I Gas with Magnetic Fields 査読有り Open Access

Fukui, Y; Hayakawa, T; Inoue, T; Torii, K; Okamoto, R; Tachihara, K; Onishi, T; Hayashi, K

ASTROPHYSICAL JOURNAL 860 巻 ( 1 ) 2018年6月

A New Look at the Molecular Gas in M42 and M43: Possible Evidence for Cloud-Cloud Collision that Triggered Formation of the OB Stars in the Orion Nebula Cluster Open Access

Fukui, Y; Torii, K; Hattori, Y; Nishimura, A; Ohama, A; Shimajiri, Y; Shima, K; Habe, A; Sano, H; Kohno, M; Yamamoto, H; Tachihara, K; Onishi, T

ASTROPHYSICAL JOURNAL 859 巻 ( 2 ) 2018年6月

Detailed CO(J=1-0, 2-1, and 3-2) observations toward an H II region RCW 32 in the Vela Molecular Ridge 査読有り Open Access

Enokiya, R; Sano, H; Hayashi, K; Tachihara, K; Torii, K; Yamamoto, H; Hattori, Y; Hasegawa, Y; Ohama, A; Kimura, K; Ogawa, H; Fukui, Y

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( Special Issue 2 ) 2018年5月

FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope (FUGIN). III. Possible evidence for formation of NGC 6618 cluster in M 17 by cloud-cloud collision 査読有り Open Access

Nishimura, A; Minamidani, T; Umemoto, T; Fujita, S; Matsuo, M; Hattori, Y; Kohno, M; Yamagishi, M; Tsuda, Y; Kuriki, M; Kuno, N; Torii, K; Tsutsumi, D; Okawa, K; Sano, H; Tachihara, K; Ohama, A; Fukui, Y

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( Special Issue 2 ) 2018年5月

Triggering the formation of the supergiant H II region NGC 604 in M 33 査読有り Open Access

Tachihara, K; Gratier, P; Sano, H; Tsuge, K; Miura, RE; Muraoka, K; Fukui, Y

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( Special Issue 2 ) 頁： 52 2018年5月

The formation of a Spitzer bubble RCW 79 triggered by a cloud-cloud collision 査読有り Open Access

Ohama, A; Kohno, M; Hasegawa, K; Torii, K; Nishimura, A; Hattori, Y; Hayakawa, T; Inoue, T; Sano, H; Yamamoto, H; Tachihara, K; Fukui, Y

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( Special Issue 2 ) 2018年5月

RCW 36 in the Vela Molecular Ridge: Evidence for high-mass star-cluster formation triggered by cloud-cloud collision 査読有り Open Access

Sano, H; Enokiya, R; Hayashi, K; Yamagishi, M; Saeki, S; Okawa, K; Tsuge, K; Tsutsumi, D; Kohno, M; Hattori, Y; Yoshiike, S; Fujita, S; Nishimura, A; Ohama, A; Tachihara, K; Torii, K; Hasegawa, Y; Kimura, K; Ogawa, H; Wong, GF; Braiding, C; Rowell, G; Burton, MG; Fukui, Y

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( Special Issue 2 ) 2018年5月

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