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NRO Legacy Project: M33 all Disk Survey of Giant Molecular Clouds with NRO 45-m and ASTE 10-m telescopes

Published online by Cambridge University Press:  05 December 2011

N. Kuno ,
T. Tosaki ,
S. Onodera ,
R. Miura ,
K. Muraoka ,
S. Komugi ,
T. Sawada ,
K. Nakanishi ,
K. Kohno  and
H. Kaneko
...Show all authors
N. Kuno
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano, 384-1305, Japan The Graduate University for Advanced Studies (SOKENDAI), Osawa, Mitaka, Tokyo, 181-8588, Japan
T. Tosaki
Affiliation:
Joetsu University of Education, Yamayashiki-machi, Joetsu, Niigata, 943-8512, Japan
S. Onodera
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano, 384-1305, Japan
R. Miura
Affiliation:
University of Tokyo, Department of Astronomy, School of Science, Hongo, Bunkyo, Tokyo, 113-0033, Japan
K. Muraoka
Affiliation:
Department of Physical Science, Osaka Prefecture University, Gakuen 1-1, Sakai, Osaka, 599-8531, Japan
S. Komugi
Affiliation:
National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo, 181-8588, Japan
T. Sawada
Affiliation:
National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo, 181-8588, Japan
K. Nakanishi
Affiliation:
National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo, 181-8588, Japan
K. Kohno
Affiliation:
Insititute of Astronomy, School of Science, The University of Tokyo, Osawa, Mitaka, Tokyo, 181-0015, Japan Research Center for Early Universe, School of Science, The University of Tokyo, Hongo, Bunkyo, Tokyo, 113-0033, Japan
H. Kaneko
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano, 384-1305, Japan The Graduate University for Advanced Studies (SOKENDAI), Osawa, Mitaka, Tokyo, 181-8588, Japan
A. Hirota
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano, 384-1305, Japan
N. Arimoto
Affiliation:
The Graduate University for Advanced Studies (SOKENDAI), Osawa, Mitaka, Tokyo, 181-8588, Japan National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo, 181-8588, Japan
H. Nakanishi
Affiliation:
Graduate School of Science and Engineering, Kagoshima University, 1-21-35 Korimoto, Kagoshima, Kagoshima 890-0065, Japan
R. Kawabe
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan, Minamimaki, Minamisaku, Nagano, 384-1305, Japan
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Abstract

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We have conducted all disk imaging of M33 in 12CO(1-0) using the 45-m telescope at Nobeyama Radio Observatory. We present preliminary results of this project. The spatial resolution of ~ 80 pc is comparable to the size of GMCs. The identified GMCs show wide variety in star forming activity. The variety can be regarded as the difference of their evolutionary stage. We found that Kennicutt-Schmidt law breaks in GMC scale (~ 80 pc), although it is still valid in 1 kpc scale. The correlation between molecular gas fraction, fmol = Σ(H2)/Σ(HI+H2) and gas surface density shows two distinct sequences and shows that fmol tends to be higher near the center. We also made partial mapping 12CO(3-2) with ASTE telescope. These data show that the variation of physical properties of molecular gas are correlated with the GMC evolution and mass. That is, GMCs with more active star formation and more mass tend to have higher fraction of dense gas.

Keywords

galaxies: individual(M33)ISMGMC
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S277: Tracing the Ancestry of Galaxies (on the land of our ancestors) , December 2010 , pp. 67 - 70
Copyright
Copyright © International Astronomical Union 2011

References

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