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Exploring the evolution of giant molecular clouds in one of the nearest spiral galaxies M33

Published online by Cambridge University Press:  09 June 2023

Ayu Konishi Open the ORCID record for Ayu Konishi [Opens in a new window] ,
Kazuyuki Muraoka ,
Kazuki Tokuda Open the ORCID record for Kazuki Tokuda [Opens in a new window] ,
Shinji Fujita ,
Rin I. Yamada ,
Fumika Demachi ,
Kengo Tachihara ,
Yasuo Fukui ,
Masato I. N. Kobayashi  and
Tsuge Kisetsu
...Show all authors
Ayu Konishi
Affiliation:
Department of Physics, Graduate School of Science, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Kazuyuki Muraoka
Affiliation:
Department of Physics, Graduate School of Science, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
Kazuki Tokuda
Affiliation:
Department of Earth and Planetary Sciences, Faculty of Sciences, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Shinji Fujita
Affiliation:
Institute of Astronomy, the University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan
Rin I. Yamada
Affiliation:
Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Fumika Demachi
Affiliation:
Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Kengo Tachihara
Affiliation:
Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Yasuo Fukui
Affiliation:
Department of Physics, Nagoya University, Chikusa-ku, Nagoya 464-8602, Japan
Masato I. N. Kobayashi
Affiliation:
National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Tsuge Kisetsu
Affiliation:
Dr. Karl Remeis Observatory and ECAP, Universität Erlangen-Nürnberg, Sternwartstraß e 7, 96049, Bamberg, Germany
Akiko Kawamura
Affiliation:
National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Toshikazu Onishi
Affiliation:
Department of Physics, Graduate School of Science, Osaka Metropolitan University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
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Abstract

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The evolution of giant molecular clouds (GMCs), which are the main sites of star formation, is essential for unraveling how stars form and how galaxies evolve. We analyzed the M33 CO(J = 2–1) data with spatial resolution of 39 pc obtained by ALMA-ACA 7 m array combined with IRAM 30 m. We identified 736 GMCs and classified them into three types; Type I: associated with no Hii regions, Type II: associated with Hii regions with the Hα luminosity L(Hα) < 1037.5 erg s-1, Type III: associated with Hii regions with L(Hα) > 1037.5erg s-1. We found that mass, size, and velocity dispersion of GMCs slightly increase in the order of Type I, II, and III GMCs. Type III GMCs mainly exist in the spiral arm, while many of Type I and Type II GMCs are distributed in the inter-arm. Assuming that the star formation proceeds steadily, we roughly estimated the total GMC lifetime of 30 Myr.

Keywords

ISM: moleculesstars: formationgalaxies: spiralgalaxies: Local Group
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 98 - 104
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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