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NRO 45 M and ASTE 10 M observations of dense gas in giant HII regions of M 33

Published online by Cambridge University Press:  04 October 2008

C. Kramer ,
S. Aalto ,
R. Simon ,
T. Tosaki ,
R. Miura ,
T. Sawada ,
N. Kuno ,
K. Nakanishi ,
K. Kohno  and
S.K. Okumura
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T. Tosaki*
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Japan
R. Miura
Affiliation:
The University of Tokyo, Japan
T. Sawada
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Japan
N. Kuno
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Japan
K. Nakanishi
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Japan
K. Kohno
Affiliation:
The University of Tokyo, Japan
S.K. Okumura
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Japan
S. Komugi
Affiliation:
The University of Tokyo, Japan
Y. Tamura
Affiliation:
The University of Tokyo, Japan
R. Kawabe
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Japan
*
[email protected]
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Abstract

Wepresent 12CO(J = 3–2) and 12CO(J = 1–0) observations of the supergiant Hii region NGC 604 in the nearest face-on spiral galaxy M 33 using the Atacama Submillimeter Telescope Experiment (ASTE) 10-m and the Nobeyama Radio Observatory (NRO) 45-m telescopes. We found high 12CO(J = 3–2)/12CO(J = 1–0) ratio gas with an arc-like distribution (“high-ratio gas arc”) surrounding the central star cluster of NGC 604. Our results suggest that dense gas formation and second-generation star formation occur in the surrounding gas compressed by the stellar wind and/or supernova of the first-generation stars of NGC 604, i.e., the central star cluster of NGC 604. Thus, NGC 604 is an example of large-scale sequential star formation.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 31: Far-Infrared Workshop 2007 , 2008 , pp. 211 - 212
Copyright
© EAS, EDP Sciences, 2008

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References

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Tosaki, T., et al., 2007, ApJ, 664, L27 CrossRef