Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..138h&link_type=abstract
Spitzer Proposal ID #138
Astronomy and Astrophysics
Astrophysics
Scientific paper
Undestanding the star formation histories of galaxies in the early universe is a key goal of observational astrophysics. The most straightforward way to do this is to measure the strengths of both the evolved and young stellar components for samples of galaxies at high redshift. We will use 3-hours of Spitzer Space Telescope time to obtain deep IRAC and MIPS images in order to measure the rest-frame near- and mid-infrared emission from fourteen robustly star forming galaxies in the z=2.313 Coup Fourre' galaxy cluster, discovered in our ultra-deep emission line survey. The combined rest-frame UV to mid-IR spectral energy distributions will (1) constrain the evolved stellar populations in the cluster galaxies, allowing us to (2) model their star formation histories (e.g., recent starburst or exponentially decaying SFR, etc.) with Starburst99 and Pegase. Moreover, we will (3) identify highly obscured cluster galaxies and (4) measure photometric redshifts for objects dominated by evolved stars throughout the 8 Mpc2 IRAC & MIPS fields of view. Selecting cluster galaxies based on both massive star formation and evolved stellar content will yield a more complete census of star and galaxy formation in an epoch when the Universe was only 20% of its current age.
Higdon James J.
Houck James R.
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