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CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303

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Title: CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303
Authors: Yashima, Yoshiyuki Browse this author
Kajikawa, Ayumi Browse this author
Komatsuzaki, Ryusei Browse this author
Kita, Shoichiro Browse this author
Watanabe, Yoshimasa Browse this author
Seta, Masumichi Browse this author
Shibata, Shugo Browse this author
Oi, Nagisa Browse this author
Yasuda, Atsushi Browse this author
Kuroda, Mayu Browse this author
Yoda, Moe Browse this author
Takeuchi, Tsutomu T Browse this author
Noma, Yuto Browse this author
Pan, Hsi-An Browse this author
Matsumoto, Naoko Browse this author
Morokuma-Matsui, Kana Browse this author
Salak, Dragan Browse this author
Sato, Yuya Browse this author
Tanaka, Takahiro Browse this author
Nakai, Naomasa Browse this author
Nakanishi, Hiroyuki Browse this author
Kaneko, Hiroyuki Browse this author
Miyamoto, Yusuke Browse this author
Muraoka, Kazuyuki Browse this author
Kuno, Nario Browse this author
Sorai, Kazuo Browse this author
Yajima, Yoshiyuki Browse this author
Keywords: galaxies: individual (NGC 4303)
galaxies: ISM
galaxies: spiral
galaxies: star formation
radio lines: galaxies
Issue Date: Dec-2019
Publisher: Oxford University press
Journal Title: Publications of the Astronomical Society of Japan
Volume: 71
Issue: Supplement_1
Start Page: S13
Publisher DOI: 10.1093/pasj/psz022
Abstract: We present the results of 12CO(J = 1–0) and 13CO(J = 1–0) simultaneous mappings toward the nearby barred spiral galaxy NGC4303 as part of the CO Multi-line Imaging of Nearby Galaxies (COMING) project. Barred spiral galaxies often show lower starformation efficiency (SFE) in their bar region compared to the spiral arms. In this paper, we examine the relation between the SFEs and the volume densities of molecular gas n(H2) in the eight different regions within the galactic disk with CO data combined with archival far-ultraviolet and 24 μm data. We confirmed that SFE in the bar region is lower by 39% than that in the spiral arms. Moreover, velocity-alignment stacking analysis was performed for the spectra in the individual regions. Integrated intensity ratios of 12CO to 13CO (R12/13) ranging from 10 to 17 were the results of this stacking. Fixing a kinetic temperature ofmolecular gas, n(H2)was derived from R12/13 via non-local thermodynamic equilibrium (non-LTE) analysis. The density n(H2) in the bar is lower by 31%–37% than that in the arms and there is a rather tight positive correlation between SFEs and n(H2), with a correlation coefficient of ∼0.8. Furthermore, we found a dependence of n(H2) on the velocity dispersion of inter-molecular clouds (ΔV/sin i). Specifically, n(H2) increases as ΔV/sin i increases when ΔV/sin i < 100kms−1. On the other hand, n(H2) decreases as ΔV/sin i increases whenΔV/sin i>100kms−1. These relations indicate that the variations of SFE could be caused by the volume densities of molecular gas, and the volume densities could be governed by the dynamical influence such as cloud–cloud collisions, shear, and enhanced inner-cloud turbulence.
Rights: This is a pre-copyedited, author-produced version of an article accepted for publication in Publications of the Astronomical Society of Japan following peer review. The version of record CO Multi-line Imaging of Nearby Galaxies (COMING). III. is available online at:
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 矢島 義之

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