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Journal article
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
arXiv.org
07 May 2003
Abstract
Astron.J.126:2209,2003 Many 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
Metrics
Details
- 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
- Creators
- Scott F Anderson - University of WashingtonWolfgang Voges - High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck SocietyBruce Margon - Space Telescope Science InstituteJoachim Trümper - High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck SocietyMarcel A Agüeros - University of WashingtonThomas Boller - High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck SocietyMatthew J Collinge - Princeton UniversityL Homer - University of WashingtonGregory Stinson - University of WashingtonMichael A Strauss - Princeton UniversityJames Annis - FermilabPercy Gomez - Carnegie Mellon UniversityPatrick B Hall - Pontificia Universidad Católica de ChileRobert C Nichol - Carnegie Mellon UniversityGordon T Richards - Princeton UniversityDonald P Schneider - Pennsylvania State UniversityDaniel E. Vanden Berk - University of PittsburghXiaohui Fan - University of ArizonaZeljko Ivezić - Princeton UniversityJeffrey A Munn - United States Department of the NavyHeidi Jo Newberg - Rensselaer Polytechnic InstituteMichael W Richmond - Rochester Institute of TechnologyDavid H Weinberg - The Ohio State UniversityBrian Yanny - FermilabNeta A Bahcall - Princeton UniversityJ Brinkmann - New Mexico State UniversityMasataka Fukugita - University of TokyoDonald G York - University of Chicago
- Publication Details
- arXiv.org
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Physics
- Web of Science ID
- WOS:000186494200009
- Scopus ID
- 2-s2.0-0345887216
- Other Identifier
- 991019201512904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Astronomy & Astrophysics