IRAC and MIPS Mapping of Galaxy Populations in a Supercluster at z=1.27

Details IRAC and MIPS Mapping of Galaxy Populations in a Supercluster at z=1.27 IRAC and MIPS Mapping of Galaxy Populations in a Supercluster at z=1.27

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20694s&link_type=abstract

Spitzer Proposal ID #20694

Computer Science

Scientific paper

We propose to complete the mapping of the Lynx supercluster at z=1.27 in the mid-infrared, to cover a large range of environments that will include newly discovered galaxy groups. The proposed observations would obtain IRAC data on the 7 recently discovered groups, and MIPS 24 micron imaging of all the groups and the two central clusters. The two short wavelength IRAC bands sample the rest-frame near-IR, where the SED of old stellar populations peaks, so these data are useful for constraining estimates of stellar masses. Knowledge of the way that the stellar mass function varies with local galaxy density at z > 1 would be valuable for comparisons with the results for the low z universe derived from SDSS. We will combine the four IRAC bands with our optical and NIR data to measure accurate spectral energy distributions, to which evolutionary spectral synthesis models can be fit in order to estimate the stellar population ages and masses, as well as refined photometric redshifts. We will use the MIPS 24 micron observations to measure star-formation activity as a function of local environment in the supercluster to investigate the location of star formation during the transitions of field galaxies through groups and into clusters.

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