Combined Program on Cosmic IR Background/Evolution of SFR/Lyman Break and SCUBA SED's

Details Combined Program on Cosmic IR Background/Evolution of SFR/Lyman Break and SCUBA SED's Combined Program on Cosmic IR Background/Evolution of SFR/Lyman Break and SCUBA SED's

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop...64f&link_type=abstract

Spitzer Proposal ID #64

Physics

Scientific paper

This program combines three scientific programs: Detection of the Cosmic IR Background, evolution of the Cosmic star formation rate, and SED's of Lyman Break and SCUBA sources. Only the latter is described in detail here at this time. Over the past few years Steidel et al. have used the Lyman Break technique with great success to identify UV-bright star-forming galaxies at redshifts of 3 and 4. The expected corrections for extinction to the star formation rates are large, suggesting much of the luminosity will be reradiated in the mid and far infrared. Also in thelast few years, several high redshift galaxies have been detected at submm wavelengths, which again has been interpreted as due to high star formation rates reradiated by dust. The submm emission is generally on the (modified) Rayleigh-Jeans tail of the blackbody emission from the dust, and hence does not in itself significantly constrain basic properties such as dust temperature and bolometric luminosity. Lacking these constraints, estimates of star formation rates in these objects are wildly uncertain. We will use SIRTF observations to address these issues. IRAC measurements of redshifted near IR light provide a good estimate of the total stellar mass present. IRS measurements of the very strong 7.7um PAH feature are diagnostic of whether an AGN or starburst dominates the bolometric luminosity. And MIPS far IR photometry directly measures the dust temperature and luminosity. Adding these pieces to the puzzle will tell us the true total star formation rate in these objects.

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