CO Multi-line Imaging of Nearby Galaxies (COMING). IV. Overview of the project

Kazuo Sorai, Nario Kuno, Kazuyuki Muraoka, Yusuke Miyamoto, Hiroyuki Kaneko, Hiroyuki Nakanishi, Naomasa Nakai, Kazuki Yanagitani, Takahiro Tanaka, Yuya Sato, Dragan Salak, Michiko Umei, Kana Morokuma-Matsui, Naoko Matsumoto, Saeko Ueno, Hsi An Pan, Yuto Noma, Tsutomu T. Takeuchi, Moe Yoda, Mayu KurodaAtsushi Yasuda, Yoshiyuki Yajima, Nagisa Oi, Shugo Shibata, Masumichi Seta, Yoshimasa Watanabe, Shoichiro Kita, Ryusei Komatsuzaki, Ayumi Kajikawa, Yu Yashima, Suchetha Cooray, Hiroyuki Baji, Yoko Segawa, Takami Tashiro, Miho Takeda, Nozomi Kishida, Takuya Hatakeyama, Yuto Tomiyasu, Chey Saita

研究成果: Article査読

33 被引用数 (Scopus)


Observations of the molecular gas in galaxies are vital to understand the evolution and star-forming histories of galaxies. However, galaxies with molecular gas maps of their whole discs at sufficient resolution to distinguish galactic structures are severely lacking. Millimeter-wavelength studies at a high angular resolution across multiple lines and transitions are particularly needed, severely limiting our ability to infer the universal properties of molecular gas in galaxies. Hence, we conducted a legacy project with the 45 m telescope of the Nobeyama Radio Observatory, called the CO Multi-line Imaging of Nearby Galaxies (COMING), which simultaneously observed 147 galaxies with high far-infrared (FIR) flux in 12CO, 13CO, and C18O J = 1-0 lines. The total molecular gas mass was derived using the standard CO-to-H2 conversion factor and found to be positively correlated with the total stellar mass derived from the WISE 3.4 μm band data. The fraction of the total molecular gas mass to the total stellar mass in galaxies does not depend on their Hubble types nor the existence of a galactic bar, although when galaxies in individual morphological types are investigated separately, the fraction seems to decrease with the total stellar mass in early-type galaxies and vice versa in late-type galaxies. No differences in the distribution of the total molecular gas mass, stellar mass, or the total molecular gas to stellar mass ratio was observed between barred and non-barred galaxies, which is likely the result of our sample selection criteria, in that we prioritized observing FIR bright (and thus molecular gas-rich) galaxies.

ジャーナルPublications of the Astronomical Society of Japan
出版ステータスPublished - 2019 12月 1

ASJC Scopus subject areas

  • 天文学と天体物理学
  • 宇宙惑星科学


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