Computer Science
Scientific paper
Jun 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sptz.prop70036p&link_type=abstract
Spitzer Proposal ID #70036
Computer Science
Scientific paper
Recent observations have revealed that a significant fraction of gamma-ray bursts originate from highly dust-obscured regions. We propose to target the host galaxies of a subset of GRBs whose afterglows show evidence for a large amount (A_V > 2 mag) of extinction with IRAC for deep imaging at 3.6 and 4.5 microns to complement existing ground-based and HST optical and NIR imaging of these targets. At typical redshifts of z=1-4, this rest-frame NIR imaging (in complement with optical and UV data) provides an essential constraint in distinguishing highly extinguished starburst galaxies from galaxies with old stellar populations and allows us to measure or constrain the average extinction and stellar mass, both of which are critical for accurately comparing the properties of these galaxies with the hosts of unobscured gamma-ray bursts and with typical star-forming galaxies at these redshifts. The results will allow us to infer the distribution and nature of dust in star-forming galaxies at redshifts up to z=4 and constrain the extent to which gamma-ray bursts trace the overall (obscured+unobscured) star formation rate of the universe.
Bloom Joshua
Cenko Bradley S.
Fynbo Johan
Hjorth Jens
Levan Andrew
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