Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725126w&link_type=abstract
American Astronomical Society, AAS Meeting #217, #251.26; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Giant molecular clouds (GMCs) are the home of star formation, yet are difficult to observe and thus their physical characteristics remain largely unknown. The proximity, size, inclination and star-forming properties of the Large Magellanic Cloud (LMC, distance 50kpc) present a perfect opportunity for a comprehensive, high-spectral-resolution and high-spatial-resolution survey of these clouds. Using the 12CO (1-0) and 13CO (1-0) Magellanic Mopra Assessment (MAGMA) data, we study over 155 giant molecular clouds distributed throughout the LMC at 8pc resolution. The 13CO (1-0) transition is detected at or above the level of significance in all clouds examined. The intensity ratio of the 13CO (1-0) to 12CO (1-0) transitions is found to be highly uniform across the LMC, not varying strongly with GMC evolutionary state, galactocentric regions, star formation rate or interaction with the Milky Way. We discover an unexplained correlation between 12CO average brightness temperature and the isotope intensity ratio. We produce galaxy-wide spectra in 12CO (1-0) and 13CO (1-0) and examine the galaxy-wide 13CO (1-0) to 12CO (1-0) ratio, simulating observations of similar, more distant galaxies. Comparison of this ratio with the ratio measured locally from individual clouds yields an overall 13CO (1-0) filling factor of 0.3 of 12CO(1-0).
Hughes Arthur
Meier Dave
Muller Eduard
Ott Jorgen
Pineda Jesus
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