Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aspc..424..266x&link_type=abstract
Proceedings of the 9th International Conference of the Hellenic Astronomical Society, proceedings of a conference held 20-24 Sep
Astronomy and Astrophysics
Astronomy
Scientific paper
We report on the results of our large molecular line survey of Luminous Infrared Galaxies (LIRGs) conducted with the JCMT and the 30-m telescopes, aiming at a detailed picture of the molecular gas properties in vigorously star-forming systems in the local Universe. We find exceptionally bright 12CO J=4-3 lines sharply marking the emergence of the star forming molecular gas phase in the global CO line luminosities of LIRGs. For several of the most IR luminous systems the high-excitation 12CO J=6-5 line is found to be very faint, incompatible with the excitation state of the large amounts of warm and dense molecular gas fuelling the extreme star formation in such galaxies. We find that large optical depths at submillimeter wavelengths are likely responsible for suppressing this line into a nearly blackbody dust emission.
Isaak Kate
Papadopoulos Philippos
van der Werf Paul P.
Xilouris Emmanuel M.
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