Physics
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50126c&link_type=abstract
Spitzer Proposal ID #50126
Physics
Scientific paper
We propose 51.5 hours of IRS spectroscopy of a complete, luminosity limited sample of 12 submm galaxies detected at high significance at 250 GHz (> 5sigma) in the Cosmos field. These observations will address two fundamental questions concerning the submm galaxies: (i) do starbursts dominate the energetics of these systems, and if so, how do the physical conditions compare to lower z, lower luminosity starbursts?, and (ii) is there a substantial (up to 30%) high redshift tail (z > 3.6) of hyper-luminous IR galaxies? Such a high redshift tail provides key leverage into models of massive galaxy formation in the early universe. A major legacy of Spitzer has been the demonstration that accurate redshifts for distant, luminous, dust-obscured star forming galaxies can be derived from the PAH features, in addition to the important physical diagnostics on dust heating and composition that come from such spectra. Observing the high S/N, unbiased Cosmos/MAMBO sample will complete this legacy, and test the theory that submm galaxies represent the formation of large elliptical galaxies in massive, dusty starbursts in dense environments at high redshift.
Aguirre James
Aravena Manuel
Aussel Herve
Bertoldi Frank
Carilli Chris
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