TY - JOUR
T1 - CO Multi-line Imaging of Nearby Galaxies (COMING). IV. Overview of the project
AU - Sorai, Kazuo
AU - Kuno, Nario
AU - Muraoka, Kazuyuki
AU - Miyamoto, Yusuke
AU - Kaneko, Hiroyuki
AU - Nakanishi, Hiroyuki
AU - Nakai, Naomasa
AU - Yanagitani, Kazuki
AU - Tanaka, Takahiro
AU - Sato, Yuya
AU - Salak, Dragan
AU - Umei, Michiko
AU - Morokuma-Matsui, Kana
AU - Matsumoto, Naoko
AU - Ueno, Saeko
AU - Pan, Hsi An
AU - Noma, Yuto
AU - Takeuchi, Tsutomu T.
AU - Yoda, Moe
AU - Kuroda, Mayu
AU - Yasuda, Atsushi
AU - Yajima, Yoshiyuki
AU - Oi, Nagisa
AU - Shibata, Shugo
AU - Seta, Masumichi
AU - Watanabe, Yoshimasa
AU - Kita, Shoichiro
AU - Komatsuzaki, Ryusei
AU - Kajikawa, Ayumi
AU - Yashima, Yu
AU - Cooray, Suchetha
AU - Baji, Hiroyuki
AU - Segawa, Yoko
AU - Tashiro, Takami
AU - Takeda, Miho
AU - Kishida, Nozomi
AU - Hatakeyama, Takuya
AU - Tomiyasu, Yuto
AU - Saita, Chey
N1 - Funding Information:
The authors thank the referee for very many and invaluable comments and suggestions, which significantly improved the manuscript. We would also like to gratefully acknowledge Alex Pettitt for his helping to improve the paper greatly. We are grateful to the NRO staff for the operation of the 45 m telescope and their continuous efforts to improve the performance of the instruments. This work is based on one of the legacy programs of the Nobeyama 45 m radio telescope, which is operated by Nobeyama Radio Observatory, a branch of National Astronomical Observatory of Japan. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This work was supported by Japan Society for the Promotion of Science KAKENHI (Grant Nos. 17K14251 and 18K13593).
Publisher Copyright:
© 2019 The Author(s) 2019. Published by Oxford University Press on behalf of the Astronomical Society of Japan.
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
KW - atlases
KW - galaxies: ISM
KW - galaxies: statistics
KW - methods: data analysis
KW - surveys
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U2 - 10.1093/pasj/psz115
DO - 10.1093/pasj/psz115
M3 - Article
AN - SCOPUS:85082469597
SN - 0004-6264
VL - 71
JO - Publication of the Astronomical Society of Japan
JF - Publication of the Astronomical Society of Japan
M1 - S14
ER -