Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 53, Issue 6, Pages 971-984Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/53.6.971
Keywords
galaxies : ISM; galaxies : Magellanic Clouds; ISM : clouds; radio lines : ISM
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From a (CO)-C-12 (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 14 1 gas, whose H I column density is greater than 10(21) cm(-2). It is notable that the mass ratio of the molecular-to-atomic hydrogen of the lower radial velocity component of gas is similar to 0.2, which is a factor of 2 higher than Chat of the gaseous-disk component, similar to 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.
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