Molecular Gas in IR-Bright Galaxies: Masses and Physical Conditions

Details Molecular Gas in IR-Bright Galaxies: Masses and Physical Conditions Molecular Gas in IR-Bright Galaxies: Masses and Physical Conditions

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3605b&link_type=abstract

Spitzer Proposal ID #3605

Computer Science

Scientific paper

We propose a program of mid-infrared and submillimeter spectroscopy of molecular gas probes in a sample of 24 IR-bright galaxies. We will combine Spitzer observations of the pure rotational transitions of molecular hydrogen with observations of optically-thin CO isotopes only possible with sensitive receivers at the Caltech Submillimeter Observatory (CSO). The two measurements are complementary, and the combination with existing datasets will allow estimates of total molecular gas mass and the run of temperature with mass in its warm components. The results will test theories of gas heating and cooling and star formation in massive dusty galaxies, and guide extrapolations to the more distant ULIGs and the high-redshift submillimeter galaxy popluation. Our sample is carefully selected from the much larger Submillimeter Local Galaxy Sample (SLUGS), and benefits from ongoing spectral and continuum observations which will benefit our analysis.

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