A Complete Survey of Obscured Quasars

Details A Complete Survey of Obscured Quasars A Complete Survey of Obscured Quasars

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005noao.prop...70b&link_type=abstract

NOAO Proposal ID #2005B-0070

Computer Science

Scientific paper

We have uncovered a previously undetected population of heavily obscured quasars with a Spitzer survey of 9 deg^2 of Bootes. The space density of these objects is too low for them to be in the Chandra or Hubble deep fields. These quasars are too obscured in the optical and X-ray to be detected by previous wide-field surveys, and most are radio-quiet. These quasars may comprise 20% to 50% of the overall quasar population. We will use GMOS spectra, along with existing MMT and Spitzer IRS spectra, to produce complete spectroscopic samples of 24 micron and 70 micron sources brighter than 4 mJy and 80 mJy respectively. We will use the spectroscopic redshifts and Spitzer photometry to measure the obscured quasar fraction as a function of bolometric luminosity. This has not been possible with previous radio, X-ray, or optical samples. As the extended optical emission of type II quasars is dominated by stellar continuum, we will use the obscured quasar sample to measure the growth of supermassive blackholes and stellar mass at z~2.

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