Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3294b&link_type=abstract
Spitzer Proposal ID #3294
Physics
Scientific paper
The environment in which a galaxy resides shapes its star formation (SF) history and present-day SF rates. Huge efforts have addressed this critical issue, primarily using optical emission-lines; these efforts find that SF is suppressed in dense environments. However, limited radio and IR data tentatively suggest that mergers, tidal interactions and ram-pressure effects can drive intense bursts of obscured SF, which are overlooked by optical observations. We propose deep MIPS and IRAC observations of a 0.5x0.5 degree field encompassing the Abell 901/902 supercluster region in order to explore the amount, distribution, and physical drivers of obscured SF in a wide range of environments. From our ultra-precise delta z=0.02 COMBO-17 photometric redshift catalog (1200 cluster members and >10000 background galaxies), we know that the Abell 901/902 supercluster has three dense sub-clusters connected by a low-density filamentary network, allowing characterization of obscured SF over a wide range of densities in a single field. From deep X-ray and weak lensing data, we also know that the X-ray luminosity to dark-matter density ratio varies from sub-cluster to sub-cluster, giving powerful leverage to differentiate between ram-pressure and tidal influences on obscured SF. In this 39hr proposal, we will study obscured SF down to roughly LMC luminosities (likely reaching 95 per cent of total cluster SF) in A901/902 using near-confusion-limited MIPS 24um data (where 70 and 160 data will help constrain SED shape for brighter galaxies). IRAC data is requested to pin down precise positions to attach redshifts to MIPS detections. Using these data we will address: Is SF always suppressed by dense environments, or is there a moderate density regime where SF is acutally enhanced? In which environments is the bulk of SF at the current epoch? How much SF in dense environments is heavily obscured? Do ram-pressure or tidal effects lead to obscured SF?
Balogh Michael
Bell Eric
Gray Meghan
Meisenheimer Klaus
Papovich Casey
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