A systematic Spitzer-IRS survey of obscured starburst galaxies at 1.0<z<1.9

Details A systematic Spitzer-IRS survey of obscured starburst galaxies at 1.0<z<1.9 A systematic Spitzer-IRS survey of obscured starburst galaxies at 1.0<z<1.9

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30364h&link_type=abstract

Spitzer Proposal ID #30364

Physics

Scientific paper

We propose deep IRS observations of 32 starburst dominated ULIRGs over 1.02L*) galaxies, and probably local massive structures such as galaxy clusters, but their properties and evolution are poorly constrained. Previous studies with Spitzer have tried to study distant obscured starbursts, but used simple selection methods that resulted in AGN dominated samples. Here, we employ a physically motivated selection method that has been directly validated with previous IRS observations to assemble a large sample of obscured starbursts at z~1.5 for observation with IRS. By obtaining high quality spectra of our targets we will (1) determine their contribution to 24 micron source counts at faint fluxes, and thus reconcile source count models with observations, (2) measure obscurations, star formation rates and AGN luminosities, to establish the likely formation history of local >2L* galaxies, and (3) determine accurate redshift distributions for use in clustering analyses of larger samples. We also include IRS observations of a complementary sample; optically faint 70 micron sources in the same field. Both count models and SED modelling indicate these galaxies are obscured starbursts at 0.5

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