High Redshift Obscured Quasars Selected In The Mid-infrared

Details High Redshift Obscured Quasars Selected In The Mid-infrared High Redshift Obscured Quasars Selected In The Mid-infrared

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21348403l&link_type=abstract

American Astronomical Society, AAS Meeting #213, #484.03; Bulletin of the American Astronomical Society, Vol. 41, p.453

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss the properties of several zgt;22; obscured quasars selected in the mid-infared. Near infrared spectroscopy and photometry shows that these objects are a mixture of "true" type-2s with broad lines and quasar continua absent in the rest-frame optical, and objects with lighter reddening with the quasar still visible in the rest-frame optical. Despite strong selection effects disfavoring our finding obscured quasars at high redshift, we do see a significant population of highly luminous obscured quasars at z>2. This is consistent with the results of studies of radio-intermediate objects selected using joint radio-infrared selection, and with a continuation to high luminosities and redshifts of the observed trend in X-ray samples for obscuration to increase with redshift. The UV spectra of these objects typically show weak Ly-alpha and strong, narrow high-ionization lines, often combined with a relatively strong UV continuum whose origin is unclear.

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