Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30642t&link_type=abstract
Spitzer Proposal ID #30642
Physics
Scientific paper
We request imaging with both IRAC and MIPS of a contiguous 6'x10' region centered on MS 2053-04, a massive galaxy cluster at z=0.59 (1.2e15 Msun). MS2053 is one in only a handful of clusters at z>0.5 with more than 150 spectroscopically confirmed members. It is a classic Butcher-Oemler cluster that is in the process of accreting a significant fraction of new members (~25%) and subsequently has an unusually high fraction of emission line members (44%). MS2053 also lenses a galaxy at z=3.15 into two giant gravitational arcs. The multi-band mid-IR imaging is needed to measure total star formation rates in the 157 confirmed members and identify those with active galactic nuclei. In combination with our wide-field X-ray, optical, and near-IR imaging and extensive spectroscopic survey, the mid-IR observations will enable us to (1) determine whether star formation and/or nuclear activity is enhanced in newly accreted members; (2) trace how quickly the progenitors of S0 members build up their stellar masses; and (3) search for dusty, star-forming galaxies that are lensed by the cluster.
Illingworth Garth
Tran K.-V.
Webb Tracy
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