Spitzer Imaging and Spectroscopy of Collisional Ring Galaxies

Details Spitzer Imaging and Spectroscopy of Collisional Ring Galaxies Spitzer Imaging and Spectroscopy of Collisional Ring Galaxies

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20369a&link_type=abstract

Spitzer Proposal ID #20369

Computer Science

Scientific paper

We propose Spitzer imaging and IRS spectroscopy of a sample of twelve collisional ring galaxies. These galaxies exhibit radially-expanding massive- star forming rings which are believed to be the gravitational response of the target disk to a head-on collision of a companion through its center. Among the most luminous kinds of galaxy found by GALEX in the UV, these collisional systems are particularly suitable for studying interstellar dust under a wide variety of excitation conditions and metallicities. Spitzer imaging and MIR-spectroscopy, in combination with a large body of ancillary data and models, will allow us to: 1) determine the SEDs of massive star formation knots around the rings from the UV to the far-IR, and 2) investigate how the properties of dominant dust grain populations vary with the large range of conditions seen in the rings, 3) investigate how the strength of PAH--features varies with metallicity, and 4) search for (dust enshrouded) secondary star formation sites inside the rings predicted to be triggered by the collapse of molecular clouds in the wake of the ring passage. Understanding the response of dust grains to a wide range of excitation conditions in collisional systems will contribute to our understanding of the rest-frame mid-IR properties of high redshift galaxies seen in deep Spitzer surveys.

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