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.creatorAnderson, Scott F.
dc.creatorVoges, Wolfgang
dc.creatorMargon, Bruce
dc.creatorTrümper, Joachim
dc.creatorAgüeros, Marcel A.
dc.creatorBoller, Thomas
dc.creatorCollinge, Matthew J.
dc.creatorHomer, L.
dc.creatorStinson, Gregory
dc.creatorStrauss, Michael A.
dc.creatorAnnis, James
dc.creatorGomez, Percy
dc.creatorHall, Patrick B.
dc.creatorNichol, Robert C.
dc.creatorRichards, Gordon T.
dc.creatorSchneider, Donald P.
dc.creatorBerk, Daniel E. Vanden
dc.creatorFan, Xiaohui
dc.creatorIvezić, Zeljko
dc.creatorMunn, Jeffrey A.
dc.creatorNewberg, Heidi Jo
dc.creatorRichmond, Michael W.
dc.creatorWeinberg, David H.
dc.creatorYanny, Brian
dc.creatorBahcall, Neta A.
dc.creatorBrinkmann, J.
dc.creatorFukugita, Masataka
dc.creatorYork, Donald G.
dc.date2003-05-07
dc.date2003-08-16
dc.date.accessioned2026-07-07T11:08:13Z
dc.date.available2026-07-07T11:08:13Z
dc.descriptionMany open questions in X-ray astronomy are limited by the relatively small number of objects in uniform optically-identified samples, especially when rare subclasses are considered, or subsets isolated to search for evolution or correlations between wavebands. We describe initial results of a program aimed to ultimately yield 10^4 X-ray source identifications--a sample about an order of magnitude larger than earlier efforts. The technique employs X-ray data from the ROSAT All-Sky Survey (RASS), and optical imaging and spectroscopic followup from the Sloan Digital Sky Survey (SDSS). Optical objects in the SDSS catalogs are automatically cross-correlated with RASS X-ray source positions; then priorities for follow-on SDSS optical spectra of candidate counterparts are automatically assigned using an algorithm based on the known fx/fopt ratios for various 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 catalog of 1200 spectroscopically confirmed quasars/AGN that are probable RASS identifications. Most of the IDs are new, and only a few percent of the AGN are likely to be random superpositions. The magnitude and redshift ranges of the counterparts extend over 15<m<21 and 0.03<z<3.6. Although most IDs are quasars and Sy 1s, a variety of other AGN subclasses are also sampled. Substantial numbers of rare AGN are found, including more than 130 narrow-line Seyfert 1s and 45 BL Lac candidates. These results already provide a sizeable set of new IDs, show utility of the sample in multi-waveband studies, and demonstrate the capability of the RASS/SDSS approach to efficiently proceed towards the largest homogeneously selected/observed sample of X-ray emitting AGN. Abridged Abstract
dc.description39 pages, 11 bitmapped figs (PDF view or print OK). Version accepted by AJ: slightly expanded sample, 1 new fig, minor modifications
dc.identifierhttps://arxiv.org/abs/astro-ph/0305093
dc.identifierhttp://arxiv.org/abs/astro-ph/0305093
dc.identifierAstron.J.126:2209,2003
dc.identifierdoi:10.1086/378999
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/190063
dc.subjectAstrophysics
dc.titleA 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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