研究者詳細 - 立原　研悟

論文 - 立原　研悟

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Molecular gas in the H II-region complex RCW 166: Possible evidence for an early phase of cloud-cloud collision prior to the bubble formation 査読有り Open Access

Ohama, A; Kohno, M; Fujita, S; Tsutsumi, D; Hattori, Y; Torii, K; Nishimura, A; Sano, H; Yamamoto, H; Tachihara, K; Fukui, Y

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

Molecular clouds toward three Spitzer bubbles S116, S117, and S118: Evidence for a cloud-cloud collision which formed the three H II regions and a 10 pc scale molecular cavity 査読有り Open Access

Fukui, Y; Ohama, A; Kohno, M; Torii, K; Fujita, S; Hattori, Y; Nishimura, A; Yamamoto, H; Tachihara, K

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 70 巻 ( {SP}2 ) 2018年5月

Molecular clouds in the NGC6334 and NGC6357 region: Evidence for a 100 pc-scale cloud-cloud collision triggering the Galactic mini-starbursts (vol 70, pg S41, 2018) 査読有り Open Access

Fukui, Y; Kohno, M; Yokoyama, K; Torii, K; Hattori, Y; Sano, H; Nishimura, A; Ohama, A; Yamamoto, H; Tachihara, K

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

Molecular clouds in the NGC 6334 and NGC 6357 region: Evidence for a 100 pc-scale cloud-cloud collision triggering the Galactic mini-starbursts 査読有り Open Access

Fukui, Y; Kohno, M; Yokoyama, K; Torii, K; Hattori, Y; Sano, H; Nishimura, A; Ohama, A; Yamamoto, H; Tachihara, K

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

Large-scale CO J =1-0 observations of the giant molecular cloud associated with the infrared ring N35 with the Nobeyama 45 m telescope 査読有り Open Access

Torii, K; Fujita, S; Matsuo, M; Nishimura, A; Kohno, M; Kuriki, M; Tsuda, Y; Minamidani, T; Umemoto, T; Kuno, N; Hattori, Y; Yoshiike, S; Ohama, A; Tachihara, K; Shima, K; Habe, A; Fukui, Y

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

High-mass star formation possibly triggered by cloud-cloud collision in the H II region RCW 34 査読有り Open Access

Hayashi, K; Sano, H; Enokiya, R; Torii, K; Hattori, Y; Kohno, M; Fujita, S; Nishimura, A; Ohama, A; Yamamoto, H; Tachihara, K; Hasegawa, Y; Kimura, K; Ogawa, H; Fukui, Y

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

Formation of the young compact cluster GM 24 triggered by a cloud-cloud collision 査読有り Open Access

Fukui, Y; Kohno, M; Yokoyama, K; Nishimura, A; Torii, K; Hattori, Y; Sano, H; Ohama, A; Yamamoto, H; Tachihara, K

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): Molecular clouds toward W 33; possible evidence for a cloud-cloud collision triggering O star formation 査読有り Open Access

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

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

Molecular Cloud Structures and Massive Star Formation in N159 査読有り Open Access

Nayak, O; Meixner, M; Fukui, Y; Tachihara, K; Onishi, T; Saigo, K; Tokuda, K; Harada, R

ASTROPHYSICAL JOURNAL 854 巻 ( 2 ) 2018年2月

Star Formation in the Sh 2-53 Region Influenced by Accreting Molecular Filaments 査読有り Open Access

Baug, T; Dewangan, LK; Ojha, DK; Tachihara, K; Pandey, AK; Sharma, S; Tamura, M; Ninan, JP; Ghosh, SK

ASTROPHYSICAL JOURNAL 852 巻 ( 2 ) 2018年1月

A Detailed Study of the Interstellar Protons toward the TeV γ-Ray SNR RX J0852.0-4622 (G266.2-1.2, Vela Jr.): The Third Case of the γ-Ray and ISM Spatial Correspondence 査読有り Open Access

Fukui, Y; Sano, H; Sato, J; Okamoto, R; Fukuda, T; Yoshiike, S; Hayashi, K; Torii, K; Hayakawa, T; Rowell, G; Filipovic, MD; Maxted, N; McClure-Griffiths, NM; Kawamura, A; Yamamoto, H; Okuda, T; Mizuno, N; Tachihara, K; Onishi, T; Mizuno, A; Ogawa, H

ASTROPHYSICAL JOURNAL 850 巻 ( 1 ) 2017年11月

FOREST unbiased Galactic plane imaging survey with the Nobeyama 45 m telescope (FUGIN). I. Project overview and initial results 査読有り Open Access

Umemoto, T; Minamidani, T; Kuno, N; Fujita, S; Matsuo, M; Nishimura, A; Torii, K; Tosaki, T; Kohno, M; Kuriki, M; Tsuda, Y; Hirota, A; Ohashi, S; Yamagishi, M; Handa, T; Nakanishi, H; Omodaka, T; Koide, N; Matsumoto, N; Onishi, T; Tokuda, K; Seta, M; Kobayashi, Y; Tachihara, K; Sano, H; Hattori, Y; Onodera, S; Oasa, Y; Kamegai, K; Tsuboi, M; Sofue, Y; Higuchi, AE; Chibueze, JO; Mizuno, N; Honma, M; Muller, E; Inoue, T; Morokuma-Matsui, K; Shinnaga, H; Ozawa, T; Takahashi, R; Yoshiike, S; Costes, J; Kuwahara, S

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69 巻 ( 5 ) 2017年10月

Interstellar gas and X-rays toward the Young supernova remnant RCW86; pursuit of the origin of the thermal and non-thermal X-ray 査読有り Open Access

Sano, H; Reynoso, EM; Mitsuishi, I; Nakamura, K; Furukawa, N; Mruganka, K; Fukuda, T; Yoshiike, S; Nishimura, A; Ohama, A; Torii, K; Kuwahara, T; Okuda, T; Yamamoto, H; Tachihara, K; Fukui, Y

JOURNAL OF HIGH ENERGY ASTROPHYSICS 15 巻頁： 1 - 18 2017年9月

Molecular and Atomic Clouds toward NGC 2359: Evidence for Isolated Wolf-Rayet Star Formation Triggered by a Cloud-Cloud Collision 査読有り

Hidetoshi Sano, Kazufumi Torii, Shun Saeki, Kazuki Okawa, Kisetsu Tsuge, Daichi Tsutsumi, Mikito Khono, Yusuke Hattori, Shinji Fujita, Satoshi Yoshiike, Rei Enokiya, Ryuji Okamoto, Katsuhiro Hayashi, Atsushi Nishimura, Akio Ohama, Takahiro Hayakawa, Hiroaki Yamamoto, Kengo Tachihara, Cristina Elisabet Cappa, Yasuo Fukui

2017年8月

掲載種別：研究論文（学術雑誌）

NGC 2359 is an HII region located in the outer Galaxy that contains the 
isolated Wolf-Rayet (WR) star HD 56925. We present new CO observations of NGC 
2359 with the Nobeyama 45 m radio telescope and the Atacama Submillimeter 
Telescope Experiment using the $^{12}$CO($J$ = 1-0, 3-2) emission lines and 
compare them with archived HI and radio-continuum data from the Very Large 
Array. Our purpose is to investigate whether the formation of the WR star in 
NGC 2359 was triggered by a cloud-cloud collision. We find two molecular clouds 
at $\sim$37 and $\sim$54 km s$^{-1}$, and two HI clouds at $\sim$54 and 
$\sim$63 km s$^{-1}$. All are likely to be associated with NGC 2359 as 
suggested by good morphological correspondence not only with an optical dark 
lane through the nebula but also with the radio-shell boundary. We also find 
that the molecular cloud at $\sim$54 km s$^{-1}$ has a high kinematic 
temperature of at least $\sim$40 K, thus indicating that the gas temperature 
has been increased because of heating by the WR star. We propose that both NGC 
2359 and the isolated WR star were created by a collision between the two 
molecular clouds. The supersonic velocity separation of the two clouds cannot 
be explained by stellar feedback from the WR star. The complementary spatial 
distributions and bridging features of CO and HI also are in good agreement 
with the expected observational signatures of high-mass star formations 
triggered by cloud-cloud collisions. We argue that NGC 2359 may be in the final 
phase of a cloud-cloud collision and that the collision timescale is $\sim$1.5 
Myr or longer. We also note that there is no significant difference between the 
physical properties of colliding clouds that trigger the formation of isolated 
O-type and WR stars.

arXiv

Discovery of Molecular and Atomic Clouds Associated with the Magellanic Superbubble 30 Doradus C 査読有り Open Access

Sano, H; Yamane, Y; Voisin, F; Fujii, K; Yoshiike, S; Inaba, T; Tsuge, K; Babazaki, Y; Mitsuishi, I; Yang, R; Aharonian, F; Rowell, G; Filipovic, MD; Mizuno, N; Tachihara, K; Kawamura, A; Onishi, T; Fukui, Y

ASTROPHYSICAL JOURNAL 843 巻 ( 1 ) 2017年7月

Formation of the young massive cluster R136 triggered by tidally-driven colliding HI flows 査読有り Open Access

Fukui, Y; Tsuge, K; Sano, H; Bekki, K; Yozin, C; Tachihara, K; Inoue, T

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 69 巻 ( 3 ) 2017年6月

High-mass star formation in Orion triggered by cloud-cloud collision II, Two merging molecular clouds in NGC2024 査読有り

Akio Ohama, Daichi Tsutsumi, Hidetoshi Sano, Kazufumi Torii, Atsushi Nishimura, Kazuhiro Shima, Habe Asao, Hiroaki Yamamoto, Kengo Tachihara, Yutaka Hasagawa, Kimihiro Kimura, Hideo Ogawa, Yasuo Fukui

2017年6月

掲載種別：研究論文（学術雑誌）

We analyzed the NANTEN2 13CO (J=2-1 and 1-0) datasets in NGC 2024. We found 
that the cloud consists of two velocity components, whereas the cloud shows 
mostly single-peaked CO profiles. The two components are physically connected 
to the HII region as evidenced by their close correlation with the dark lanes 
and the emission nebulosity. The two components show complementary distribution 
with a displacement of 0.4 pc. Such complementary distribution is typical to 
colliding clouds discovered in regions of high-mass star formation. We 
hypothesize that cloud-cloud collision between the two components triggered the 
formation of the late O stars and early B stars localized within 0.3 pc of the 
cloud peak. The collision timescale is estimated to be ~ 10^5 yrs from a ratio 
of the displacement and the relative velocity 3-4 km s-1 corrected for probable 
projection. The high column density of the colliding cloud 1023 cm-2 is similar 
to those in the other massive star clusters in RCW 38, Westerlund 2, NGC 3603, 
and M42, which are likely formed under trigger by cloud-cloud collision. The 
present results provide an additional piece of evidence favorable to high-mass 
star formation by a major cloud-cloud collision in Orion.

arXiv

High-mass star formation in Orion possibly triggered by cloud-cloud collision III, NGC2068 and NGC2071 査読有り

Shinji Fujita, Daichi Tsutsumi, Akio Ohama, Asao Habe, Nirmit Sakre, Kazuki Okawa, Mikito Kohno, Yusuke Hattori, Atsushi Nishimura, Kazufumi Torii, Hidetoshi Sano, Kengo Tachihara, Kimihiro Kimura, Hideo Ogawa, Yasuo Fukui

2017年6月

掲載種別：研究論文（学術雑誌）

Using the NANTEN2 Observatory, we carried out a molecular line study of 
high-mass star forming regions with reflection nebulae, NGC 2068 and NGC 2071, 
in Orion in the 13CO(J=2-1) transition. The 13CO distribution shows that there 
are two velocity components at 9.0 and 10.5 km/s . The blue-shifted component 
is in the northeast associated with NGC 2071, whereas the red-shifted component 
is in the southwest associated with NGC 2068. The total intensity distribution 
of the two clouds shows a gap of ~1 pc, suggesting that they are detached at 
present. A detailed spatial comparison indicates that the two show 
complementary distributions. The blue-shifted component lies toward an 
intensity depression to the northwest of the red-shifted component, where we 
find that a displacement of 0.8 pc makes the two clouds fit well with each 
other. Furthermore, a new simulation of non-frontal collisions shows that 
observations from 60 degrees off the collisional axis agreed well with the 
velocity structure in this region. On the basis of these results, we 
hypothesize that the two components collided with each other at a projected 
relative velocity 3.0 km/s estimated to be 0.3 Myr for an assumed axis of the 
relative motion 60 degrees off the line of sight. We assume that the two most 
massive early B-type stars in the cloud, illuminating stars of the two 
reflection nebulae, were formed by collisional triggering at the interfaces 
between the two clouds. Given the other young high-mass star forming regions, 
namely, M42, M43, and NGC 2024 (Fukui et al. 2018b; Ohama et al. 2017a), it 
seems possible that collisional triggering has been independently working to 
form O-type and early B-type stars in Orion in the last Myr over a projected 
distance of ~80 pc.

arXiv

A new view of the giant molecular cloud M16 (Eagle Nebula) in 12CO J=1-0 and 2-1 transitions with NANTEN2 査読有り

Atsushi Nishimura, Jean Costes, Tetsuta Inaba, Kengo Tachihara, Yusuke Hattori, Mikito Kohno, Akio Ohama, Kazufumi Torii, Hidetoshi Sano, Hiroaki Yamamoto, Yutaka Hasegawa, Kimihiro Kimura, Hideo Ogawa, Yasuo Fukui

2017年6月

掲載種別：研究論文（学術雑誌）

M16, the Eagle Nebula, is an outstanding HII region where extensive high-mass 
star formation is taking place in the Sagittarius Arm, and hosts the remarkable 
"pillars" observed with HST. We made new CO observations of the region in the 
12CO J=1--0 and J=2--1 transitions with NANTEN2. These observations revealed 
for the first time that a giant molecular cloud of $\sim 1.3 \times 10^5$ \Msun 
\ is associated with M16, which is elongated vertically to the Galactic plane 
over 35 pc at a distance of 1.8 kpc. We found a cavity of the molecular gas of 
$\sim 10$ pc diameter toward the heart of M16 at \lbeq (16.95\degree, 
0.85\degree), where more than 10 O-type stars and $\sim 400$ stars are 
associated, in addition to a close-by molecular cavity toward a Spitzer bubble 
N19 at \lbeq (17.06\degree, 1.0\degree). We found three velocity components 
which show spatially complementary distribution in the entire M16 giant 
molecular cloud (GMC) including NGC6611 and N19, suggesting collisional 
interaction between them. Based on the above results we frame a hypothesis that 
collision between the red-shifted and blue-shifted components at a relative of 
$\sim 10$ \kms \ triggered formation of the O-type stars in the M16 GMC in the 
last 1-2 Myr. The collision is two fold in the sense that one of the 
collisional interactions is major toward the M16 cluster and the other toward 
N19 with a RCW120 type, the former triggered most of the O star formation with 
almost full ionization of the parent gas, and the latter an O star formation in 
N19.

arXiv

A Massive Molecular Outflow in the Dense Dust Core AGAL G337.916-00.477 査読有り Open Access

Torii, K; Hattori, Y; Hasegawa, K; Ohama, A; Yamamoto, H; Tachihara, K; Tokuda, K; Onishi, T; Hattori, Y; Ishihara, D; Kaneda, H; Fukui, Y

ASTROPHYSICAL JOURNAL 840 巻 ( 2 ) 2017年5月

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