Warm Molecular Hydrogen in Cool-Core Galaxy Clusters

Details Warm Molecular Hydrogen in Cool-Core Galaxy Clusters Warm Molecular Hydrogen in Cool-Core Galaxy Clusters

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21537801d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #378.01; Bulletin of the American Astronomical Society, Vol. 42, p.587

Astronomy and Astrophysics

Astronomy

Scientific paper

In all nine of our sample of Spitzer Space Telescope IRS spectra of cool-core galaxy clusters, we detect strong emission from molecular hydrogen. Pure rotational molecular hydrogen gives rise to a suite of emission lines in the MIR from H2 0-0 S(0) to H2 0-0 S(7). Several of our targets have MIR spectra dominated by H2, with only weak PAH and continuum emission, demonstrating that cool-core cluster BCGs comprise a significant fraction of the population of molecular hydrogen emission galaxies (MOHEGs). In all cases, the level populations are consistent with multi-phase gas with most of the mass (up to 5 million solar masses) of warm H2 contained in reservoirs at about 300 K but with some molecular gas as hot as about 1300 K. We present our analysis of the pure rotational H2 emission and discuss in the context of the mass of cold H2 inferred from CO observations.

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