Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30945k&link_type=abstract
Spitzer Proposal ID #30945
Physics
Scientific paper
We propose Spitzer MIPS and IRAC observations for a carefully selected sample of 36 Virgo cluster spiral and peculiar galaxies. The detailed information that Spitzer provides on the interstellar medium, star formation, and stellar populations, when combined with our considerable data base and simulations, will greatly improve our understanding of interactions in clusters and the consequences for galaxy evolution. For this sample, we already have VLA HI and radio continuum images from the VIVA survey, optical BVRH-alpha imaging, GALEX UV images, and optical spectroscopy. Mapping the unobscured distributions of star formation at 24um will reveal the effects of interactions, such as tidally triggered central starbursts, and ram-pressure induced star formation at the outer edges of stripped gas disks. We will compare the observed distributions of star formation with predictions from simulations which are already tightly constrained by the optical and HI data. The Spitzer 8um PAH images show outer galaxy ISM with a combination of sensitivity and resolution better than optical and HI images. This outer galaxy dust is a powerful tracer of the types of interactions and their timescales. Comparisons with B-I ``dust extinction'' maps will constrain interaction models by clarifying the ISM geometry. The near-IR data from IRAC, together with GALEX UV, H-alpha, and optical spectroscopy, will provide spatially-resolved star formation histories. Analyzing the expected variations in the radio-to-FIR ratio in extraplanar regions will also provide strong constraints on the physical processes which generally link these two emissions so tightly in star-forming galaxies. These galaxies are different from galaxies outside of clusters, since most of them have been significantly modified by their environment. The science goals are distinct from SINGS, although complementary, and would use the SINGS data as a benchmark for comparison with non-cluster galaxies.
Beck Ranier
Helou George
Kenney Jeffrey
Makovoz David
Murphy Eric
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