Redshift Distribution of Obscured and Unobscured Quasars

Details Redshift Distribution of Obscured and Unobscured Quasars Redshift Distribution of Obscured and Unobscured Quasars

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344707r&link_type=abstract

American Astronomical Society, AAS Meeting #213, #447.07; Bulletin of the American Astronomical Society, Vol. 41, p.334

Astronomy and Astrophysics

Astronomy

Scientific paper

We are currently undertaking a spectroscopic survey of luminous AGN and quasars selected in the mid-infrared from Spitzer surveys. Mid-infrared selection is much less biased with respect to obscuration than optical techniques, and hence enables the discovery of obscured quasars as well as normal, unobscured ones. Our survey therefore provides a unique opportunity to construct luminosity functions for both obscured and unobscured quasars selected in the same way and covering similar redshifts and luminosities. We have been using 4m class telescopes (e.g. CTIO, Palomar, SOAR) to obtain observations of the brighter 24 micron targets in the sample that are more thinly spread (targeting high luminosity objects at low z), and we have also obtained spectroscopy with Gemini and the MMT to find lower luminosity high redshift obscured quasars by targeting the fainter 24 micron targets. Filling out these portions of the luminosity/redshift plane will allow us to disentangle any luminosity dependence of the obscured quasar fraction from its evolution with redshift. We can then test models of the obscured quasar population, in particular at the highest redshifts and luminosities where we are seeing a previously undiscovered population of obscured objects. Here we will present current progress on determination of the redshift distribution and luminosity function of these mid-infrared selected quasars.

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