Other
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20683t&link_type=abstract
Spitzer Proposal ID #20683
Other
Scientific paper
We propose to obtain a deep MIPS 24 micron map (18'x18') of a protocluster made of 4 distinct galaxy groups that are gravitationally bound to each other at z=0.37. The galaxy groups already have a total combined mass comparable to the Coma cluster, but they have at least 4 times as many emission line galaxies as Coma. The SG1120 complex thus provides an unprecedented opportunity for determining when and how star formation is quenched (or briefly enhanced) in the galaxies that will evolve into cluster members. MIPS is ideal for measuring the emission due to warm dust at mid-IR wavelengths. This sensitive tracer of integrated star formation enables us to identify weakly star-forming members (~1 solar mass/year) to very dusty, strongly star-forming ones, e.g. ultra-luminous infrared galaxies (ULIRGs) and the possible progenitors of post-starburst (E+A) members. Combining mid-IR with the deep, wide-field X-ray/optical/near-IR imaging and spectroscopy we already have in hand, we will trace how star formation varies as a function of environment and how quickly cluster galaxies build up their stellar masses.
Gonzalez Anthony
Moustakas John
Tran K.-V.
Zaritsky Dennis
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