AAS 201st Meeting, January, 2003
Session 114. Quasars
Poster, Thursday, January 9, 2003, 9:20am-4:00pm, Exhibit Hall AB

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[114.17] A Population of Type II Quasars in the Sloan Digital Sky Survey

N.L. Zakamska, M.A. Strauss, P.B. Hall, L. Hao, Z. Ivezic, D.J. Schlegel (Princeton University Observatory)

Type II quasars are the long sought luminous cousins of type II (narrow emission line) Seyfert galaxies, inevitable in unification models of active galactic nuclei (AGN) and postulated to account for an appreciable fraction of the cosmic hard X-ray background. We present a sample (over 300 objects) of optically-selected narrow-line (FWHM<2000 km sec-1) AGN with 0.3 < z < 3 from the Sloan Digital Sky Survey. We describe the selection procedure and discuss the collective and individual properties of the objects found, as well as procedures for nominal extinction correction to infer unobscured luminosity. Finally, we present estimates of the selection efficiency and discuss type I / type II AGN statistics at high redshifts.

Funding for the SDSS is provided by the Alfred P. Sloan Foundation, NASA, NSF, DoE, Monbukagakusho, the Max Planck Society and the member institutions. The SDSS web site is http://www.sdss.org/

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.