LBQS - Large Bright Quasar Survey

Overview

Positions, redshifts, and magnitudes for the 1055 quasars in the Large Bright Quasar Survey (LBQS) are presented in a single catalog. Celestial positions have been rederived using the PPM catalog to provide an improved reference frame. Redshifts calculated via cross correlation with a high signal-to-noise ratio composite quasar spectrum are included and the small number of typographic and redshift misidentifications in the discovery papers are corrected.

Compared to the discovery papers (references below), 12 quasars that are either fainter than the field magnitude limit or fall outside the final survey area have been deleted, 12 quasars that were discovered subsequent to paper V have been added, 10 redshifts have been corrected, and 13 quasars with either incorrect or degenerate designations (LBQS names) have had their designations corrected.

The information in this version of the LBQS Catalog is the same as in Table 4 of the published paper with the following exceptions: (i) the object 0021-0213 has a redshift of 2.348; this value was listed in Table 5 of the paper but was not incorporated in Table 4 of the paper; (ii) the parameter 'Reference' in Table 4 of the published paper (which specified in which paper in the LBQS series the quasar spectrum could be found) has been omitted; and (iii) the parameter 'Notes' in Table 4 of the published paper had two non-blank values: '+' and 'a'; in the HEASARC representation of this catalog we have replaced the Notes value of '+' by 'C', and dropped the Notes value of 'a' (used to indicate objects that had been listed as AGN in earlier papers).

Catalog Bibcode

1995AJ....109.1498H

References

The Large Bright Quasar Survey. VI. Quasar catalog and survey parameters. Hewett P.C., Foltz C.B., Chaffee F.H. <Astron. J. 109, 1498 (1995)> 1995 AJ....109.1498H (SIMBAD/NED BibCode). The previous publications in this series were:

    Paper   I: Foltz et al.     =1987AJ.....94.1423F
    Paper  II: Foltz et al.     =1989AJ.....98.1959F
    Paper III: Hewett et al.    =1991AJ....101.1121H
    Paper  IV: Chaffee et al.   =1991AJ....102..461C
    Paper   V: Morris et al.    =1991AJ....102.1627M

Provenance

This catalog was created by the HEASARC in July 1999 based on a table that was kindly provided by the first author, Paul Hewett, supplemented by documentation created by the CDS/ADC.

Parameters

Name
A source designation that comprises the string 'LBQS ', a nine character string made up from the Equinox B1950 coordinates, and a suffix A and B added to resolve degeneracies in the naming convention for some of the entries.

RA
The right ascension in the specified equinox. The original catalog, as published in AJ, gave 2 types of positions for each entry, corresponding to Equinoxes B1950 and J2000, to a precision of 0.01 seconds of time (RA) and 0.1 arcseconds (Dec). For the Browse version of this catalog, the HEASARC used the B1950 positions to populate RA and Dec and so, to retain the full original accuracy, the user should select Equinox 1950 in Browse using the command "cey 1950". For the W3Browse version of this catalog, the HEASARC used the J2000 positions to populate RA and Dec and so, to retain the full original accuracy, the user should select Equinox 2000 in W3Browse.

Dec
The declination in the specified equinox. The original catalog, as published in AJ, gave 2 types of positions for each entry, corresponding to Equinoxes B1950 and J2000, to a precision of 0.01 seconds of time (RA) and 0.1 arcseconds (Dec). For the Browse version of this catalog, the HEASARC used the B1950 positions to populate RA and Dec and so, to retain the full original accuracy, the user should select Equinox 1950 in Browse using the command "cey 1950". For the W3Browse version of this catalog, the HEASARC used the J2000 positions to populate RA and Dec and so, to retain the full original accuracy, the user should select Equinox 2000 in W3Browse.

LII
Galactic longitude of the quasar.

BII
Galactic latitude of the quasar.

Redshift
The redshift of the quasar.

Bjmag
The apparent magnitude of the quasar as measured on the UKST direct plate in the B_j band. The B_j band is defined by the response function of the hypersensitized Kodak IIIa-J emulsion combined with a Schott GG395 filter.

Field_Info
The LBQS UKST field in which the quasar resides, as defined in Table 1 of the published catalog which descibed the direct and objective-prism plate material for each field as follows:

           Field          Plate  Filter Exp.  Date (UT) Grade Seeing
         Direct / Prism                 min                     "

      F823  00 00 +00 00   J7940  GG395  60  27 Jul 1982  A2   2.5
                          UJ6543P  NONE  45  07 Nov 1980  AE3  2.0
      F824  00 20 +00 00   J8202  GG395  60  05 Nov 1982  AI3  2.5
                         UJ11474P  NONE  60  01 Nov 1986  BI4  2.5
      SGP   00 53 -28 00   J9766  GG395  70  23 Nov 1984  A    2.5
                          UJ3682P  NONE  70  17 Oct 1977  A    2.0
      F826  01 00 +00 00   J7915  GG395  60  20 Jul 1982  BI3  3.0
                         UJ12187P  NONE  85  23 Sep 1987  A1   2.0
      F832  03 00 +00 00   J8288  GG395  60  09 Dec 1982  BIE3 3.0
                         UJ12188P  NONE  85  23 Sep 1987  A1   2.0
      F854  10 20 +00 00  J10147  GG395  65  11 May 1985  AIE3 2.0
                         UJ11746P  NONE  65  01 Apr 1987  AI3  2.0
      F858  11 40 +00 00   J9301  GG395  60  23 May 1984  BI3  3.0
                         UJ11757P  NONE  65  02 Apr 1987  AP2  2.0
      VSW   12 16 +15 27   J4884  GG395  60  24 Mar 1979  A    2.5
                         UJ10742P  NONE  44  15 Feb 1986  BI   3.0
      VNW   12 16 +11 12   J4889  GG395  60  25 Mar 1979  *    3.0
                         UJ10732P  NONE  55  10 Feb 1986  BID3 3.0
      VSE   12 34 +11 12   J4885  GG395  60  24 Mar 1979  *    3.5
                         UJ10738P  NONE  55  11 Feb 1986  AI2  2.5
      VNE   12 34 +15 27   J4888  GG395  60  25 Mar 1979  *    2.0
                         UJ10749P  NONE  45  16 Feb 1986  A    2.0
      F861  12 40 +00 00   J5023  GG395  65  19 May 1979  AI2  2.5
                          UJ5853P  NONE  45  14 Apr 1980  AR3  2.0
      F863  13 20 +00 00  J11048  GG395  27  16 Apr 1986  A    2.5
                         UJ11759P  NONE  65  02 Apr 1987  AP1  2.0
      F864  13 40 +00 00   J9108  GG395  60  07 Mar 1984  AI3  3.0
                          UJ6997P  NONE  55  04 May 1981  AI3  2.0
      F867  14 40 +00 00   J5773  GG395  72  19 Mar 1980  A0   2.0
                         UJ11760P  NONE  65  02 Apr 1987  AI2  2.0
      F287  21 28 -45 00   J6229  GG395  65  09 Aug 1980  A    2.0
                          UJ4520P  NONE  60  30 Sep 1978  AI3  2.5
      MTF   22 03 -18 55   J1746  GG395  70  06 Aug 1975  BI4  4.0
                          UJ6526P  NONE  45  30 Oct 1980  A    2.0
      F891  22 40 +00 00   J8196  GG395  60  04 Nov 1982  AI2  3.0
                         UJ11478P  NONE  60  02 Nov 1986  A1   2.0

Confusion_Flag
A flag that is set to 'C' (note that the original value was '+' in the published version) if the magnitude includes a contribution from a nearby companion object. Due to the presence of the latter, the coordinates of the QSO in such a case are uncertain by up to 3 arcseconds.

Class
Browse classification: all entries in this database have been given a class of "QSO" (numerical value = 7200).

Contact Person

Questions regarding the LBQS database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:29:51 EDT