Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pasj...53..971m&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.53, No. 6, pp. 971-984
Astronomy and Astrophysics
Astronomy
79
Galaxies: Ism, Galaxies: Magellanic Clouds, Ism: Clouds, Radio Lines: Ism
Scientific paper
From a 12CO (J = 1 -- 0) survey with the NANTEN telescope, we present a complete catalog of giant molecular clouds (GMCs) in the Large Magellanic Cloud. In total, 107 CO clouds have been identified, 55 of which were detected at more than 3 observed positions. For the 55 clouds, the physical properties, such as size, line-width, virial mass, and CO luminosity, are cataloged. From a statistical analysis of these quantities, we show that GMCs in the LMC are close to gravitational equilibrium. A comparison with HI data indicates that most of the CO clouds are distributed in dense parts of HI gas, whose HI column density is greater than 1021 cm-2. It is notable that the mass ratio of the molecular-to-atomic hydrogen of the lower radial velocity component of gas is ~ 0.2, which is a factor of 2 higher than that of the gaseous-disk component, ~ 0.1. Molecular clouds are apparently formed efficiently in the parent atomic clouds in the lower velocity component. The CO Arc, which is a few kpc scale ordered structure of CO clouds along the southern optical edge of the galaxy, corresponds well to the the lower velocity component of HI gas.
Abe Rihei
Fukui Yasuo
Mizuno Akira
Mizuno Norikazu
Ogawa Hideo
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