a Survey of Cluster-Growth at Early Epochs

Details a Survey of Cluster-Growth at Early Epochs a Survey of Cluster-Growth at Early Epochs

Apr 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60112h&link_type=abstract

Spitzer Proposal ID #60112

Physics

Scientific paper

Forming clusters of galaxies, protoclusters, are unique laboratories for studying galaxy evolution as they contain large numbers of galaxies in the same rich environment. We propose to use Spitzer to study galaxy and cluster evolution during the formative epoch of dense structures (1.7 < z < 3) by observing a well-defined sample of 10 protocluster fields. These fields have already been observed at shorter wavelengths (Y, J, H, K) using the new HAWK-I wide-field imager on the VLT and form the first statistically significant sample of evolved protocluster galaxies ( ~ 800 protocluster galaxy candidates). We propose to obtain 3.6 and 4.5 micron data on the 10 fields in order to: (i) distinguish between dusty starbursts and passively evolving galaxies; and (ii) measure the masses of the protocluster galaxies. The Spitzer data will facilitate population studies of high density environments, enabling us to create the first mass-selected samples of galaxies in protoclusters at 1.7 < z < 3, and select H-alpha emitting starburst galaxies for spectroscopic follow-up.

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