IRAC Imaging of a Proto Galaxy Cluster at z~3

Details IRAC Imaging of a Proto Galaxy Cluster at z~3 IRAC Imaging of a Proto Galaxy Cluster at z~3

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3482v&link_type=abstract

Spitzer Proposal ID #3482

Physics

Scientific paper

We propose to obtain deep IRAC images in all four bands of a z~3 proto galaxy cluster. We have spectroscopically identified 31 star forming galaxies at the redshift of a z=3.16 radio galaxy, MRC0316-257. The IRAC data will sample the rest frame near-IR in the member galaxies, allowing an estimate to be made of the stellar masses. Combined with our existing optical and near-IR photometry, the IRAC data will allow us to search for non-star-forming galaxies in the protocluster, which should be easily detectable if their stellar populations formed at z ~ 5 or greater. Our target lies in the redshift gap between the z ~ 2 and z ~ 4 protoclusters targetted by GTO programs in Cycle 1. So by combining our data with those in the archive, we will be able to determine the formation history of massive galaxies in clusters as they virialize from z ~ 4 to 2, and test the predictions of the hierarchical vs monolithic collapse scenarios.

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