Candidate Type II Quasars from the Sloan Digital Sky Survey. I. Selection and Optical Properties of a Sample at 0.3 | Zendy

Nadia L. Zakamska | Zendy; Michael A. Strauss | Zendy; Julian H. Krolik | Zendy; Matthew J. Collinge | Zendy; Patrick B. Hall | Zendy; Lei Hao | Zendy; Timothy M. Heckman | Zendy; eljko Ivezi | Zendy; Gordon T. Richards | Zendy; David J. Schlegel | Zendy; Donald P. Schneider | Zendy; Iskra Strateva | Zendy; D. E. vanden Berk | Zendy; Scott F. Anderson | Zendy; J. Brinkmann | Zendy

Open Access

Candidate Type II Quasars from the Sloan Digital Sky Survey. I. Selection and Optical Properties of a Sample at 0.3<Z<0.83

Author(s) -

Nadia L. Zakamska,

Michael A. Strauss,

Julian H. Krolik,

Matthew J. Collinge,

Patrick B. Hall,

Lei Hao,

Timothy M. Heckman,

eljko Ivezi,

Gordon T. Richards,

David J. Schlegel,

Donald P. Schneider,

Iskra Strateva,

D. E. vanden Berk,

Scott F. Anderson,

J. Brinkmann

Publication year - 2003

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/378610

Subject(s) - quasar , astrophysics , physics , redshift , sky , active galactic nucleus , galaxy , emission spectrum , astronomy , equivalent width , line (geometry) , type (biology) , spectral line , geometry , mathematics , ecology , biology

Type II quasars are the long-sought luminous analogs of type II (narrowemission line) Seyfert galaxies, suggested by unification models of activegalactic nuclei (AGN) and postulated to account for an appreciable fraction ofthe cosmic hard X-ray background. We present a sample of 291 type II AGN atredshifts 0.3

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