A Spitzer Space Telescope Infrared Spectrograph Survey of Warm Molecular Hydrogen in Luminous Infrared Galaxies in the GOALS Sample

Details A Spitzer Space Telescope Infrared Spectrograph Survey of Warm Molecular Hydrogen in Luminous Infrared Galaxies in the GOALS Sample A Spitzer Space Telescope Infrared Spectrograph Survey of Warm Molecular Hydrogen in Luminous Infrared Galaxies in the GOALS Sample

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21430802p&link_type=abstract

American Astronomical Society, AAS Meeting #214, #308.02; Bulletin of the American Astronomical Society, Vol. 41, p.736

Astronomy and Astrophysics

Astronomy

Scientific paper

We will present an investigation of the H2 and CO (1-0) molecular lines in a sample of 202 local Luminous Infrared Galaxies (z<0.088) as part of the Great Observatory All-sky LIRG Survey (GOALS) Legacy project. Observations of the pure rotational transitions of molecular hydrogen S0 (28.22 microns), S1 (17.04 microns) , S2 (12.28 microns) and S3 (9.67 microns) were used to determine the mass and temperature of the warm gas. We detect the H2 S0, S2 and S3 transitions in about 30-40% or all sources and S1 in 94% of our objects. We find a wide range of ratios of the H2 to the IR luminosities between 7e-5 and 1.7e-3 with a median of 2e-4. We find a weak correlation between the warm H2 mass and IR luminosity. The derived H2 temperatures seem to change with merger stage in that more advance mergers appear to have higher temperatures. We compare the results obtained for the GOALS galaxies to similar studies of nearby galaxies and ULIRGs.

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