Spectral Energy Distributions of Galaxies with Old Stellar Populations in Radio-Source Fields with 2.8 < z < 3.6

Details Spectral Energy Distributions of Galaxies with Old Stellar Populations in Radio-Source Fields with 2.8 < z < 3.6 Spectral Energy Distributions of Galaxies with Old Stellar Populations in Radio-Source Fields with 2.8 < z < 3.6

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50032s&link_type=abstract

Spitzer Proposal ID #50032

Physics

Optics

Scientific paper

We and others have found massive (~2-3 X 10^11 solar mass in stars) galaxies at z~2.5 that are overwhelmingly dominated by stars that already at least 1 Gyr old at the observed redshift. Our HST NICMOS and Keck adaptive-optics observations of all such galaxies that we have found so far indicate that they are either dominated by disks of old stars or are so compact (r_e ~ 500 pc) that we cannot clearly distinguish between different radial-surface-brightness profiles. In either case, they are strikingly unlike massive galaxies found at the present epoch. Here we propose to obtain deep, well-sampled imaging in the 4 IRAC bands as well as imaging in the MIPS 24-micron band of the fields of 7 powerful steep-spectrum radio sources with 2.8 < z < 3.6. This redshift range will extend to higher redshifts our current successful ground-based and Spitzer search for massive galaxies with exclusively old stellar populations at z ~ 2.5. Such objects will then be subjects for laser-guided adaptive optics morphological studies. The proposed observations, together with our previous cycle 2 and cycle 3 observations and our continuing ground-based imaging program, will also allow the detailed characterization of other galaxies down to ~ L* in the environments of powerful radio sources with 2.3 < z < 4.1.

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