Shocked Molecular Gas in Virgo Spirals Being Stripped

Details Shocked Molecular Gas in Virgo Spirals Being Stripped Shocked Molecular Gas in Virgo Spirals Being Stripped

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50819k&link_type=abstract

Spitzer Proposal ID #50819

Physics

Scientific paper

We propose IRS spectroscopy in 4 Virgo cluster spiral galaxies with evidence for strong ongoing ram pressure to search for evidence for shock-heating in the ISM. The galaxies we have selected are those galaxies in Virgo with clear evidence for strong ongoing ram pressure, from a wealth of radio continuum, optical, infrared, and HI data. For shock diagnostics we will use both the H_2/PAH ratios and the ortho-to-para ratios of H_2. We will explore correlations between the H_2/PAH ratio and the local radio deficit parameter, which is a likely tracer of the strength of current ram pressure, to see whether the degree of shock excitation of the molecular gas depends on the strength of ram pressure. Shock excitation throughout the ISM may explain the enhanced global radio-to-FIR ratios in these galaxies, and would teach us how ram pressure energizes the ISM that is not stripped.

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