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GLXSDSSQS2 - GALEX/SDSS z=0.5-1.5 QSO Candidates Catalog

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Overview

A sample of ~60,000 objects from the combined Sloan Digital Sky Survey-Galaxy Evolution Explorer (SDSS-GALEX) database with UV-optical colors that should isolate QSOs in the redshift range 0.5 to 1.5 is discussed. The authors use SDSS spectra of a subsample of ~ 4,500 to remove stellar and galaxy contaminants in the sample to a very high level, based on the 7-band photometry. In their paper, they discuss the distributions of redshift, luminosity, and reddening of the 19,100 QSOs (~96%) that they estimate to be present in their final sample of 19,812 point sources. This latter catalog is available in the present table.

This paper is based on archival data from the Galaxy Evolution Explorer (GALEX) which is operated for NASA by the California Institute of Technology under NASA contract NAS5-98034, and on data from the SDSS.


Catalog Bibcode

2010AJ....140.1987H

References

A Catalog of 19,100 Quasi-stellar Object Candidates with Redshift 0.5-1.5
    Hutchings, J.B., Bianchi, L.
   <Astron. J., 140, 1987-1994 (2010)>
   =2010AJ....140.1987H

Provenance

This table was created by the HEASARC in March 2011 based on the electronic version of Table 2 from the reference paper which was obtained from the AJ web site.

Parameters

Name
The name of the candidate QSO using the prefix '[HB2010b] GALEX' for Hutchings and Bianchi 2010b GALEX source and the J2000.0 equatorial position, e.g., '[HB2010b] GALEX J000010.7-100556'. This naming convention was not present in the original table but was created by the HEASARC using the standard CDS Dictionary of Nomenclature of Celestial Objects naming conventions. It should hence be regarded as unofficial until (and if) it is formally adopted.

RA
The Right Ascension of the candidate QSO in the selected equinox. This was given in J2000 decimal degrees to a precision of 10-7 degrees in the original table. The coordinates given are those of the SDSS source.

Dec
The Declination of the candidate QSO in the selected equinox. This was given in J2000 decimal degrees to a precision of 10-7 degrees in the original table. The coordinates given are those of the SDSS source.

LII
The Galactic Longitude of the candidate QSO.

BII
The Galactic Latitude of the candidate QSO.

Fmag
The GALEX calibrated magnitude of the object, in units of AB magnitude for the far-UV (FUV) photometric band (f band) from 1344 - 1786 Angstroms (A). The effective wavelength of the FUV channel is 1538.6 Angstroms (Bianchi et al. 2009, AJ, 137, 3761).

Fmag_Error
The uncertainty in the FUV-band magnitude of the object.

Nmag
The GALEX calibrated magnitude of the object, in units of AB magnitude for the near-UV (NUV) photometric band (n band) from 1771 - 2831 A. The effective wavelength of the NUV channel is 2315.7 Angstroms (Bianchi et al. 2009, AJ, 137, 3761).

Nmag_Error
The uncertainty in the NUV-band magnitude of the object.

Umag
The SDSS data release 7 (DR7) u-band AB magnitude of the matching SDSS source to the GALEX source.

Umag_Error
The uncertainty in the u-band AB magnitude of the matching SDSS source to the GALEX source.

Gmag
The SDSS data release 7 (DR7) g-band AB magnitude of the matching SDSS source to the GALEX source.

Gmag_Error
The uncertainty in the g-band AB magnitude of the matching SDSS source to the GALEX source.

Rmag
The SDSS data release 7 (DR7) r-band AB magnitude of the matching SDSS source to the GALEX source.

Rmag_Error
The uncertainty in the r-band AB magnitude of the matching SDSS source to the GALEX source.

Imag
The SDSS data release 7 (DR7) i-band AB magnitude of the matching SDSS source to the GALEX source.

Imag_Error
The uncertainty in the i-band AB magnitude of the matching SDSS source to the GALEX source.

Zmag
The SDSS data release 7 (DR7) z-band AB magnitude of the matching SDSS source to the GALEX source.

Zmag_Error
The uncertainty in the z-band AB magnitude of the matching SDSS source to the GALEX source.

Reddening
The local foreground extinction (E(B-V)) value in the direction of the object, based on the Schlegel et al. (1998, ApJ, 500, 525) maps.


Contact Person

Questions regarding the GLXSDSSQS2 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 10-Mar-2011