Completing MIPS imaging for the Spitzer Interacting Galaxy study

Details Completing MIPS imaging for the Spitzer Interacting Galaxy study Completing MIPS imaging for the Spitzer Interacting Galaxy study

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50696f&link_type=abstract

Spitzer Proposal ID #50696

Mathematics

Logic

Scientific paper

We propose to complete the MIPS coverage of a coherent set of Spitzer observations of a large representative sample of 110 nearby interacting galaxies. Galaxy interactions is a complex process that involves time-dependent scenarios affecting the evolution of all the participants. However, existing projects focus on sometimes small samples of galaxies chosen because they have the most active star formation, are bright in well-known optical emission line diagnostics, or otherwise obviously distinguished. The 110 galaxies we propose to study form a sample independent of obvious current activity; instead, it is based on physical proximity and relative velocity such that the pair is a likely candidate for interaction. We also limit the sample to relatively nearby galaxies (cz < 4000 km/sec), so that detailed spatialy resolved measurements can be obtained from the existing data. All the objects have been observed with IRAC, IRS, and all but the ones we propose have been observed with MIPS. By combining morphological, photometric and spectroscopic analyses of this sample, we will map the star-forming activity and we will study its connection with AGN activity and the interaction type and severity. This approach distinguishes itself in that it systematically traces the changes in a large sample of galaxies covering a variety of interaction types. Comparisons with simulations of galaxy interactions, will provide constraints to the theoretical models, and the influence of environmental factors (e.g. the initial gas content or the massive halos) on the final outcome of the interaction, including the energetics of a possible AGN component. Since galaxy-galaxy interactions are more ubiquitous at earlier epochs, this study should also improve our understanding of the early history of galaxy evolution.

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