Spitzer/IRS View of Very Metal-pool Mergers

Details Spitzer/IRS View of Very Metal-pool Mergers Spitzer/IRS View of Very Metal-pool Mergers

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sptz.prop40621h&link_type=abstract

Spitzer Proposal ID #40621

Physics

Scientific paper

We propose to study the mid-IR spectra of several candidate interacting/merging dwarf galaxies with very low-metallicity. They are representatives of a small group of local objects that best approximates the properties common to high-redshift low-mass young galaxy mergers: very metal-poor, gas-rich and interacting. Groundbased observations have identified the dwarf that show morpholog and velocity profiles characteristic of larger scale mergers. We propose to approach the problem via the rotational lines of warm molecular hydrogen. We will extend previous ISO and Spitzer investigations that have shown the H2 line to be effective markers of merging activity. We will use the H2 lines as indicators of strong shocks produced by merging activity. Here, we discuss the current data set and our approach to avoiding false positive 'dwarf mergers.' In addition we will also use this sample to study high-ionization lines of Ne and S. We will add these new data to our ongoing study of PAH emission in low-metallicity but high-excitation environments.

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