Spitzer Observations of a GRB-Selected Galaxy Cluster at z=1.8

Details Spitzer Observations of a GRB-Selected Galaxy Cluster at z=1.8 Spitzer Observations of a GRB-Selected Galaxy Cluster at z=1.8

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30718g&link_type=abstract

Spitzer Proposal ID #30718

Computer Science

Scientific paper

We propose IRAC 3.8-8 micron and MIPS 24 micron imaging of a z~1.8 galaxy cluster discovered in association with the short gamma ray burst GRB 050813. This apparent cluster, nominally the highest redshift (by far!) bona-fide cluster known to date, appears as a spatial/color overdensity of ultra-red EROs which is overdense compared to the field by a factor of 40. This unique cluster sits at a redshift which bridges the actively star-forming proto-clusters seen around AGN at higher redshift, and lower redshift collapsed clusters, and we expect to see this transformation in action. The Spitzer will allow us to confirm the reality of this cluster, refine the photometric redshifts, and examine in detail the cluster galaxy population with respect to stellar populations, dust and AGN content, and correlate these to morphology (via in-hand HST-ACS imaging). Detailed modeling of the stellar population of the GRB host galaxy itself (a cluster member) will also set the strictest possible current limits on GRB progenitor lifetimes.

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