Published in
Cambridge University Press, Proceedings of the International Astronomical Union, S373(17), p. 98-104, 2021
DOI: 10.1017/s1743921322004380
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Exploring the evolution of giant molecular clouds in one of the nearest spiral galaxies M33
,
Kazuyuki Muraoka,
Kazuki Tokuda ,
Shinji Fujita,
Rin I. Yamada,
Fumika Demachi,
Kengo Tachihara,
Yasuo Fukui,
Masato I. N. Kobayashi,
Tsuge Kisetsu,
Akiko Kawamura,
Toshikazu Onishi
Full text: Unavailable
Abstract
AbstractThe 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.