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

2019; Oxford University Press; Volume: 71; Issue: Supplement_1 Linguagem: Inglês

10.1093/pasj/psz115

2053-051X

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, T. T. Takeuchi, Moe Yoda, Mayu Kuroda, Atsushi Yasuda, Yoshiyuki Yajima, Nagisa Oi, Shugo Shibata, Masumichi Seta, Yoshimasa Watanabe, Shoichiro Kita, Ryusei Komatsuzaki, Ayumi Kajikawa, Yu Yashima, Suchetha Cooray, Hiroyuki Baji, Y. Segawa, Tashiro Takami, Miho Takeda, Nozomi Kishida, Takuya Hatakeyama, Yuto Tomiyasu, Chey Saita,

Spectroscopy and Laser Applications

Observations of the molecular gas in galaxies are vital to understanding the evolution and star-forming histories of galaxies. However, galaxies with molecular gas maps of their whole discs having 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 flux in $^{12}$CO, $^{13}$CO, and C$^{18}$O $J=1-0$ lines. The total molecular gas mass was derived using the standard CO-to-H$_2$ conversion factor and found to be positively correlated with the total stellar mass derived from the WISE $3.4 \mu$m 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, and 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.