Computer Science
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30475r&link_type=abstract
Spitzer Proposal ID #30475
Computer Science
Scientific paper
In this very short (2.1 hr) program, we propose to study the relations between different tracers of star formation rates in cluster galaxies and their evolution to high redshift. Spitzer enables observations of mid and far-infrared emission from star-forming galaxies at high redshift. We will combine archival and proposed Spitzer observations to conduct detailed studies of the star formation rates (SFRs) of galaxies in four clusters at z~0.80 and compare infrared SFR estimates to optical estimates where extinction is important. At z=0.80, H-alpha is redshifted into a near-infrared window free of strong atmospheric OH lines, enabling deep NIR spectroscopy and narrowband imaging. SFRs at high redshifts are often estimated from UV continuum or [OII] emission; these tracers may underestimate true SFRs by a factor of 2 at this redshift. Infrared observations of clusters at moderate redshift show that IR estimates of the total SFR in some clusters is 10-100 times larger than the total found in galaxies with [OII] emission. Combining the proposed Spitzer observations with Subaru spectroscopy and HST and Chandra data will (1) directly measure the relations between various SFR tracers and their evolution, (2) determine the impact of metallicity and extinction on these estimates, (3) measure correlations between SFRs and density, (4) measure the impact of the hot intracluster medium on SFRs, and (5) improve our understanding of systematic uncertainties in estimating the star formation history of clusters and the universe.
Finn Rose
Kewley Lisa
Rines Kenneth
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