201 citations · 637 across the 20 of their papers we have counts for
20 papers
Dust-to-neutral gas ratio of the intermediate and high velocity HI clouds derived based on the sub-mm dust emission for the whole sky
Takahiro Hayakawa, Yasuo Fukui
We derived the dust-to-HI ratio of the intermediate-velocity clouds (IVCs), the high-velocity clouds (HVCs), and the local HI gas, by carrying out a multiple-regression analysis of…
Pursuing the origin of the gamma rays in RX J1713.73946 quantifying the hadronic and leptonic components
Yasuo Fukui, Hidetoshi Sano, Yumiko Yamane +5
We analyzed the TeV gamma-ray image of a supernova remnant RX J1713.73946 (RX J1713) through a comparison with the interstellar medium (ISM) and the non-thermal X-rays. The gamm…
Development of the new multi-beam receiver and telescope control system for NASCO
Atsushi Nishimura, Akio Ohama, Kimihiro Kimura +59
We report the current status of the NASCO (NAnten2 Super CO survey as legacy) project which aims to provide all-sky CO data cube of southern hemisphere using the NANTEN2 4-m submil…
Rapid and efficient mass collection by a supersonic cloud-cloud collision as a major mechanism of high-mass star formation
Yasuo Fukui, Tsuyoshi Inoue, Takahiro Hayakawa +1
A supersonic cloud-cloud collision produces a shock-compressed layer which leads to formation of high-mass stars via gravitational instability. We carried out a detailed analysis o…
Gas and Dust Properties in the Chamaeleon Molecular Cloud Complex based on the Optically Thick HI
Katsuhiro Hayashi, Ryuji Okamoto, Hiroaki Yamamoto +3
Gas and dust properties in the Chamaeleon molecular cloud complex have been investigated with emission lines from atomic hydrogen (HI) and 12CO molecule, dust optical depth at 353…
Synthetic observations of highly clumped formation of CO and CI clouds in the turbulent interstellar medium; Implications on the seed CO clouds and the CO-dark H gas
Kengo Tachihara, Yasuo Fukui, Takahiro Hayakawa +1
We carried out synthetic observations of a theoretical model of interstellar carbon in CO, C I and C II including H2 formation. The theoretical model based on numerical simulations…
An Intermediate Velocity HI Cloud Falling to the Galactic Disk; Possible Evidence for Low Metallicity HI Gas Originated Outside the Galactic Disk
Yasuo Fukui, Masako Koga, Shohei Maruyama +6
We found that an intermediate velocity cloud (IVC) IVC 86-36 in HI 21 cm emission shows a head-tail distribution toward the Galactic plane with marked parallel filamentary streamer…
The formation of a Spitzer bubble RCW79 triggered by cloud-cloud collision
Akio Ohama, Mikito Kohno, Keisuke Hasegawa +9
Understanding the mechanism of O star formation is one of the most important issues in current astrophysics. It is also an issue of keen interest how O stars affect their surroundi…
Molecular and Atomic Clouds toward the Wolf-Rayet Nebula NGC 2359: Possible Evidence for Isolated High-Mass Star Formation Triggered by a Cloud-Cloud Collision
Hidetoshi Sano, Katsuhiro Hayashi, Rei Enokiya +17
NGC 2359 is an HII region located in the outer Galaxy that contains the isolated Wolf-Rayet (WR) star HD 56925. We present millimeter/submillimeter observations of CO( =…
Properties of Hi-GAL clumps in the inner Galaxy]{The Hi-GAL compact source catalogue. I. The physical properties of the clumps in the inner Galaxy ()
D. Elia, S. Molinari, E. Schisano +83
Hi-GAL is a large-scale survey of the Galactic plane, performed with Herschel in five infrared continuum bands between 70 and 500 m. We present a band-merged catalogue of spatia…
Synthetic Observations of 21cm HI Line Profiles from Inhomogeneous Turbulent Interstellar HI Gas with Magnetic Field
Yasuo Fukui, Takahiro Hayakawa, Tsuyoshi Inoue +5
We carried out synthetic observations of interstellar atomic hydrogen at 21cm wavelength by utilizing the magneto-hydrodynamical numerical simulations of the inhomogeneous turbulen…
HI, CO, and Dust in the Perseus Cloud
Ryuji Okamoto, Hiroaki Yamamoto, Kengo Tachihara +3
Comparison analyses between the gas emission data (HI 21cm line and CO 2.6 mm line) and the Planck/IRAS dust emission data (optical depth at 353 GHz tau353 and dust temperature Td)…
The jet and arc molecular clouds toward Westerlund 2, RCW 49, and HESS J1023-575; 12CO and 13CO (J=2-1 and J=1-0) observations with NANTEN2 and Mopra Telescope
N. Furukawa, A. Ohama, T. Fukuda +20
We have made new CO observations of two molecular clouds, which we call "jet" and "arc" clouds, toward the stellar cluster Westerlund 2 and the TeV gamma-ray source HESS J1023-575.…
HI, CO, and Planck/IRAS dust properties in the high-latitude-cloud complex, MBM 53, 54, 55 and HLCG 92-35; Possible evidence for an optically thick HI envelope around the CO clouds
Yasuo Fukui, Ryuji Okamoto, Ryohei Kaji +9
We present an analysis of the HI and CO gas in conjunction with the Planck/IRAS submillimeter/far-infrared dust properties toward the most outstanding high latitude clouds MBM 53,…
Discovery of possible molecular counterparts to the infrared Double Helix Nebula in the Galactic center
R. Enokiya, K. Torii, M. Schultheis +23
We have discovered two molecular features at radial velocities of -35 km/s and 0 km/s toward the infrared Double Helix Nebula (DHN) in the Galactic center with NANTEN2. The two fea…
Stochastic Acceleration of Cosmic Rays in the Central Molecular Zone of the Galaxy
Takanobu Amano, Kazufumi Torii, Takahiro Hayakawa +1
Particle acceleration in the inner ~ 200 pc of the Galaxy is discussed, where diffuse TeV gamma-rays have been detected by the High Energy Stereoscopic System (HESS) observation. T…
Molecular and Atomic Gas toward HESS J1745-303 in the Galactic Center: Further Support for the Hadronic Scenario
Takahiro Hayakawa, Kazufumi Torii, Rei Enokiya +2
We have compared the TeV gamma-rays with the new 12CO J=2-1 data toward HESS J1745-303 in the Galactic center and confirmed that the molecular gas MG358.9-0.5 toward (l, b)=(358.9,…
Star Forming Dense Cloud Cores in the TeV γ-ray SNR RX J1713.7-3946
H. Sano, J. Sato, H. Horachi +23
RX J1713.7-3946 is one of the TeV γ-ray supernova remnants (SNRs) emitting synchrotron X rays. The SNR is associated with molecular gas located at ~1 kpc. We made new molecular obs…
Warm and Dense Molecular Gas in the N159 Region: 12CO J=4-3 and 13CO J=3-2 Observations with NANTEN2 and ASTE
Yoji Mizuno, Akiko Kawamura, Toshikazu Onishi +29
New 12CO J=4-3 and 13CO J=3-2 observations of the N159 region in the Large Magellanic Cloud have been made. The 12CO J=4-3 distribution is separated into three clumps. These new me…
ASTE Submillimeter Observations of a Young Stellar Object Condensation in Cederblad 110
Masaaki Hiramatsu, Takahiro Hayakawa, Ken'ichi Tatematsu +5
We present results of submillimeter observations of a low-mass young stellar objects (YSOs) condensation in the Cederblad 110 region of the Chamaeleon I dark cloud with Atacama Sub…