A Large, Uniform Sample of X-Ray-emitting AGNs: Selection Approach and an Initial Catalog from theROSATAll-Sky and Sloan Digital Sky Surveys | Zendy

Scott F. Anderson | Zendy; W. Voges | Zendy; B. Margon | Zendy; J. Tr�mper | Zendy; Marcel A. Ageros | Zendy; Thomas Böller | Zendy; Matthew J. Collinge | Zendy; Lee Homer | Zendy; Gregory S. Stinson | Zendy; Michael A. Strauss | Zendy; James Annis | Zendy; Percy Gmez | Zendy; Patrick B. Hall | Zendy; Robert C. Nichol | Zendy; Gordon T. Richards | Zendy; Donald P. Schneider | Zendy; D. E. vanden Berk | Zendy; Xiaohui Fan | Zendy; eljko Ivezi | Zendy; Jeffrey A. Munn | Zendy; Heidi Jo Newberg | Zendy; M. Richmond | Zendy; David H. Weinberg | Zendy; B. Yanny | Zendy; Neta A. Bahcall | Zendy; J. Brinkmann | Zendy; M. Fukugita | Zendy; Donald G. York | Zendy

Open Access

A Large, Uniform Sample of X-Ray-emitting AGNs: Selection Approach and an Initial Catalog from theROSATAll-Sky and Sloan Digital Sky Surveys

Author(s) -

Scott F. Anderson,

W. Voges,

B. Margon,

J. Tr�mper,

Marcel A. Ageros,

Thomas Böller,

Matthew J. Collinge,

Lee Homer,

Gregory S. Stinson,

Michael A. Strauss,

James Annis,

Percy Gmez,

Patrick B. Hall,

Robert C. Nichol,

Gordon T. Richards,

Donald P. Schneider,

D. E. vanden Berk,

Xiaohui Fan,

eljko Ivezi,

Jeffrey A. Munn,

Heidi Jo Newberg,

M. Richmond,

David H. Weinberg,

B. Yanny,

Neta A. Bahcall,

J. Brinkmann,

M. Fukugita,

Donald G. York

Publication year - 2003

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/378999

Subject(s) - rosat , sky , astrophysics , quasar , physics , active galactic nucleus , astronomy , magnitude (astronomy) , galaxy

Many open questions in X-ray astronomy are limited by the relatively smallnumber of objects in uniform optically-identified samples, especially when raresubclasses are considered, or subsets isolated to search for evolution orcorrelations between wavebands. We describe initial results of a program aimedto ultimately yield 10^4 X-ray source identifications--a sample about an orderof magnitude larger than earlier efforts. The technique employs X-ray data fromthe ROSAT All-Sky Survey (RASS), and optical imaging and spectroscopic followupfrom the Sloan Digital Sky Survey (SDSS). Optical objects in the SDSS catalogsare automatically cross-correlated with RASS X-ray source positions; thenpriorities for follow-on SDSS optical spectra of candidate counterparts areautomatically assigned using an algorithm based on the known fx/fopt ratios forvarious classes of X-ray emitters. SDSS parameters for optical morphology,magnitude, colors, plus FIRST radio data, serve as proxies for object class. Initial application of this approach to 1400 deg^2 of sky provides a catalogof 1200 spectroscopically confirmed quasars/AGN that are probable RASSidentifications. Most of the IDs are new, and only a few percent of the AGN arelikely to be random superpositions. The magnitude and redshift ranges of thecounterparts extend over 15

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