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A large, uniform sample of X-ray emitting AGN: selection approach and an initial catalog from the ROSAT All-Sky and Sloan Digital Sky Surveys

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dc.contributor.author Anderson, Scott
dc.contributor.author Voges, Wolfgang
dc.contributor.author Margon, Bruce
dc.contributor.author Trumper, Joachim
dc.contributor.author Agueros, Marcel
dc.contributor.author Boller, Thomas
dc.contributor.author Collinge, Matthew
dc.contributor.author Homer, Lee
dc.contributor.author Stinson, Gregory
dc.contributor.author Strauss, Michael
dc.contributor.author Annis, James
dc.contributor.author Gomez, Percy
dc.contributor.author Hall, Patrick
dc.contributor.author Nichol, Robert
dc.contributor.author Richards, Gordon
dc.contributor.author Schneider, Donald
dc.contributor.author Vanden Berk, Daniel
dc.contributor.author Fan, Xiaohui
dc.contributor.author Ivezic, Zeljko
dc.contributor.author Munn, Jeffrey
dc.contributor.author Newberg, Heidi Jo
dc.contributor.author Richmond, Michael
dc.contributor.author Weinberg, David
dc.contributor.author Yanny, Brian
dc.contributor.author Bahcall, Neta
dc.contributor.author Brinkmann, Jonathan
dc.contributor.author Fukugita, Masataka
dc.contributor.author York, Donald
dc.date.accessioned 2008-11-19T15:36:10Z
dc.date.available 2008-11-19T15:36:10Z
dc.date.issued 2003-11
dc.identifier.citation The Astronomical Journal 126 (2003) 2209-2229 en_US
dc.identifier.uri http://hdl.handle.net/1850/7547
dc.description RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
dc.description.abstract Many open questions in X-ray astronomy are limited by the relatively small number of objects in uniform optically-identified and observed samples, especially when rare subclasses are considered, or when subsets are isolated to search for evolution or correlations between wavebands. We describe initial results of a new program aimed to ultimately yield 104 fully characterized X-ray source identifications—a sample about an order of magnitude larger than earlier efforts. The technique is detailed, and employs X-ray data from the ROSAT All-Sky Survey (RASS), and optical imaging and spectroscopic follow-up from the Sloan Digital Sky Survey (SDSS); these two surveys prove to be serendipitously very well matched in sensitivity. As part of the SDSS software pipelines, optical objects in the SDSS photometric catalogs are automatically positionally cross-correlated with RASS X-ray sources. Then priorities for follow-on SDSS optical spectra of candidate counterparts are automatically assigned using an algorithm based on the known ratios of fx/fopt for various classes of X-ray emitters at typical RASS fluxes of 10−13 erg cm−2 s−1. SDSS photometric parameters for optical morphology, magnitude, colors, plus FIRST radio information, serve as proxies for object class. Initial application of this approach to RASS/SDSS data from 1400 deg2 of sky provides a catalog of more than 1200 spectroscopically confirmed quasars and other AGN that are probable RASS identifications. Most of these are new identifications, and only a few percent of the AGN counterparts are likely to be random superpositions. The magnitude and redshift ranges of the counterparts are very broad, extending over 15 < m < 21 and 0.03 < z < 3.6, respectively. Although most identifications are quasars and Seyfert 1s, a variety of other AGN subclasses are also sampled. Substantial numbers of rare AGN types are found, including more than 130 narrow-line Seyfert 1s and 45 BL Lac candidates. These early results already provide a very sizeable set of source identifications, demonstrate utility of the sample in multi-waveband investigations, and show the capability of the joint RASS/SDSS approach to efficiently proceed towards the largest homogeneously selected/observed sample of X-ray emitting quasars and other kinds of AGN. en_US
dc.language.iso en_US en_US
dc.publisher American Astronomical Society - The Astronomical Journal en_US
dc.relation.ispartofseries vol. 126 en_US
dc.relation.ispartofseries no. 5 en_US
dc.relation.ispartofseries pps. 2209-2229 en_US
dc.subject Catalogs - surveys en_US
dc.subject Quasars - general en_US
dc.subject Quasars - individual en_US
dc.subject X-rays en_US
dc.title A large, uniform sample of X-ray emitting AGN: selection approach and an initial catalog from the ROSAT All-Sky and Sloan Digital Sky Surveys en_US
dc.type Article en_US
dc.identifier.url http://dx.doi.org/10.1086/378999

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