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Cloud-cloud collisions and triggered star formation
Inoue, Tsuyoshi; Tachihara, Kengo; Fukui, Yasuo +2 more
Star formation is a fundamental process for galactic evolution. One issue over the last several decades has been determining whether star formation is induced by external triggers or self-regulated in a closed system. The role of an external trigger, which can effectively collect mass in a small volume, has attracted particular attention in connec…
CO Multi-line Imaging of Nearby Galaxies (COMING). IX. 12CO(J = 2-1)/12CO(J = 1-0) line ratio on kiloparsec scales
Kobayashi, Masato I. N.; Kuno, Nario; Miyamoto, Yusuke +8 more
While molecular gas mass is usually derived from 12CO(J = 1-0)—the most fundamental line for exploring molecular gas—it is often derived from 12CO(J = 2-1) assuming a constant 12CO(J = 2-1) $/$ 12CO(J = 1-0) line ratio (R2/1). We present variations of R2/1 and effects of the assumpt…
Cloud structures in M 17 SWex : Possible cloud-cloud collision
Sanhueza, Patricio; Kim, Kee-Tae; Nakamura, Fumitaka +11 more
Using wide-field 13CO (J = 1-0) data taken with the Nobeyama 45 m telescope, we investigate cloud structures of the infrared dark cloud complex in M 17 with Spectral Clustering for Interstellar Molecular Emission Segmentation. In total, we identified 118 clouds that include 11 large clouds with radii larger than 1 pc. The clouds are mai…
Atomic carbon [C I](3P1-3P0) mapping of the nearby galaxy M 83
Seta, Masumichi; Salak, Dragan; Nakai, Naomasa +6 more
Atomic carbon (C I) has been proposed to be a global tracer of the molecular gas as a substitute for CO, however, its utility remains unproven. To evaluate the suitability of C I as the tracer, we performed [C I](3P1-3P0) [hereinafter [C I](1-0)] mapping observations of the northern part of the nearby sp…
The C18O core mass function toward Orion A: Single-dish observations
Sanhueza, Patricio; Kataoka, Akimasa; Nakamura, Fumitaka +6 more
We have performed an unbiased dense core survey toward the Orion A Giant Molecular Cloud in the C18O (J = 1-0) emission line taken with the Nobeyama Radio Observatory (NRO) 45 m telescope. The effective angular resolution of the map is 26″, which corresponds to ~0.05 pc at a distance of 414 pc. By using the Herschel-Planck H2…
FUGIN hot core survey. I. Survey method and initial results for l = 10°-20°
Hasegawa, Tetsuo; Saito, Hiro; Seta, Masumichi +4 more
We have developed a method to make a spectral-line-based survey of hot cores, which represent an important stage of high-mass star formation, and applied the method to the data of the FUGIN (FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope) survey. First, we select hot core candidates by searching the FUGIN data for t…