Mid- and Far-Infrared Spectral Energy Distribution of Type II Quasars from the Sloan Digital Sky Survey

Details Mid- and Far-Infrared Spectral Energy Distribution of Type II Quasars from the Sloan Digital Sky Survey Mid- and Far-Infrared Spectral Energy Distribution of Type II Quasars from the Sloan Digital Sky Survey

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3163s&link_type=abstract

Spitzer Proposal ID #3163

Physics

Scientific paper

The success of unification models for Seyfert galaxies raises the question of whether these models can be extended to high luminosity AGNs. Do obscured (type II) quasars exist? If so, how many are there? To date, only a small number of candidates have been found. We recently published a sample of 150 type II quasar candidates at redshifts z<0.8 selected by their emission line properties from the spectroscopic database of the Sloan Digital Sky Survey. Here we propose to perform 4-band IRAC and 3-band MIPS imaging of the 25 most luminous objects in the sample to measure their spectral energy distributions and infrared luminosities; we estimate their infrared luminosities to be as high as 10^47 erg/sec. These data will constrain physical models of circumnuclear obscuration, and thus for the first time probe unification models of AGNs at high luminosities. The infrared luminosities of the sample will allow us to construct the luminosity function of type II AGNs and to estimate their fraction in the AGN population and the contribution of obscured AGNs to the census of supermassive black holes. The total time of this program is 14.2 hours, with 2.8 hours of IRAC time and 11.4 of MIPS time. Many of the objects in the sample have been observed with HST, Chandra, XMM and MMT.

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