Other
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..250d&link_type=abstract
Spitzer Proposal ID #250
Other
Scientific paper
The cosmic epoch at redshifts between 1.5 and 2.5 appears to be the time of major formation and assembly of massive galaxies. Results from the K20 and other surveys have shown that massive galaxies with seemingly large star-formation rates are common at these epochs. We showed that massive z=2 objects can be readily isolated using photometry in only B, z and K bands. As a part of the Spitzer Fellowship program, we propose to obtain deep 24 micron observations with Spitzer+MIPS of a 350 arcmin square region where about 500 z=2 massive galaxy candidates have been selected through their BzK colors, and for many of which spectroscopic redshifts are being measured from VLT+VIMOS spectra. A large fraction of these galaxies have very red optical colors that suggest severe dust reddening. Measuring the 24 micron emission of massive z=2 galaxies will be crucial to trace the presence of dust, thus constraining their star-formation rates and contribution to the z=2 star-formation rate density. Coupled to the optical-IR photometry and optical spectra that are already available, these observations will allow to better understand the role of BzK selected objects in galaxy formation and assembly at z=2.
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