Journal Article

The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue

Scott M. Croom, Gordon T. Richards, Tom Shanks, Brian J. Boyle, Robert G. Sharp, Joss Bland-Hawthorn, Terry Bridges, Robert J. Brunner, Russell Cannon, Daniel Carson, Kuenley Chiu, Matthew Colless, Warrick Couch, Roberto De Propris, Michael J. Drinkwater, Alastair Edge, Stephen Fine, Jon Loveday, Lance Miller, Adam D. Myers, Robert C. Nichol, Phil Outram, Kevin Pimbblet, Isaac Roseboom, Nicholas Ross, Donald P. Schneider, Allyn Smith, Chris Stoughton, Michael A. Strauss and David Wake

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 392, issue 1, pages 19-44
Published in print January 2009 | ISSN: 0035-8711
Published online December 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.14052.x
The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue

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We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at probing in detail the faint end of the broad line active galactic nuclei luminosity distribution at z≲ 2.6. The candidate QSOs were selected from SDSS photometry and observed spectroscopically with the 2dF spectrograph on the Anglo-Australian Telescope. This sample covers an area of 191.9 deg2 and contains new spectra of 16 326 objects, of which 8764 are QSOs and 7623 are newly discovered [the remainder were previously identified by the 2dF QSO Redshift Survey (2QZ) and SDSS]. The full QSO sample (including objects previously observed in the SDSS and 2QZ surveys) contains 12 702 QSOs. The new 2SLAQ spectroscopic data set also contains 2343 Galactic stars, including 362 white dwarfs, and 2924 narrow emission-line galaxies with a median redshift of z= 0.22.

We present detailed completeness estimates for the survey, based on modelling of QSO colours, including host-galaxy contributions. This calculation shows that at g≃ 21.85 QSO colours are significantly affected by the presence of a host galaxy up to redshift z∼ 1 in the SDSS ugriz bands. In particular, we see a significant reddening of the objects in gi towards the fainter g-band magnitudes. This reddening is consistent with the QSO host galaxies being dominated by a stellar population of age at least 2–3 Gyr.

The full catalogue, including completeness estimates, is available on-line at http://www.2slaq.info/.

Keywords: catalogues; surveys; white dwarfs; galaxies: active; quasars: general; galaxies: Seyfert

Journal Article.  17173 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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