Access to Astronomical Catalogues

VII/223       The 2dF QSO Redshift Survey. V. The 10k catalogue   (Croom+ 2001)
The 2dF QSO Redshift Survey - V. The 10k catalogue.
    Croom S.M., Smith R.J., Boyle B.J., Shanks T., Loaring N.S., Miller L.,
    Lewis I.J.
   <Mon. Not. R. Astron. Soc. 322, L29 (2001)>
   =2001MNRAS.322L..29C
ADC_Keywords: Active gal. nuclei; QSOs; Redshifts; Spectroscopy;
              Stars, white dwarf; Stars, normal; Galaxies, spectra
Keywords: catalogues - surveys - white dwarfs - galaxies: active -
          quasars: general - galaxies: Seyfert

Description:
    The 2dF QSO Redshift Survey (2QZ) 10k catalogue is the first release
    of the 2QZ, containing over 10000 QSOs. There are a total of 20590
    sources listed, for which spectra have been obtained using the
    2-degree field facility at the Anglo-Australian Observatory. Current
    data covers an effective area of 289.6deg2 for QSO candidates with
    magnitudes 18.25<bJ<20.85. The file 2qz_10k.dat contains the
    names, positions, magnitudes, spectroscopic identifications and
    redshifts for each of the sources.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
2qz10k.dat       199    20590   List of object properties including position,
                                 identification and redshift


Byte-by-byte Description of file: 2qz10k.dat

   Bytes Format Units   Label    Explanations

   1-  3  A3    ---     ---      [2QZ] Name of Survey
   5- 20  A16   ---     Name     Name of the source in 2QZ
  22- 23  I2    h       RAh      Right ascension (J2000)
  25- 26  I2    min     RAm      Right ascension (J2000)
  28- 32  F5.2  s       RAs      Right ascension (J2000)
      34  A1    ---     DE-      Declination sign
  35- 36  I2    deg     DEd      Declination (J2000)
  38- 39  I2    arcmin  DEm      Declination (J2000)
  41- 44  F4.1  arcsec  DEs      Declination (J2000)
  46- 53  F8.6  rad     RArad    Right ascension (J2000)
  55- 63  F9.6  rad     DErad    Declination (J2000)
  65- 69  F5.2  mag     bJmag    bJ magnitude
  71- 75  F5.2  mag     u-bJ     u-bJ colour
  77- 82  F6.2  mag     bJ-r     b_J_-r colour (1)
      84  I1    ---     o_bJmag  Number of observations (2)
  86- 90  F5.3  ---     z1       Redshift from first spectrum
  92- 93  I2    ---     q_z1     Quality flag for first spectrum (3)
  95-105  A11   ---     id1      Identification for first spectrum (4)
 107-116  A10   "D/M/Y" date1    Date of observation for first spectrum (5)
 118-121  I4    ---     fld1     field and spectrograph for first spectrum (6)
 123-128  F6.2  ---     sn1      Signal-to-noise ratio for first spectrum (7)
 130-134  F5.3  ---     z2       ?=0 Redshift from second spectrum
 136-137  I2    ---     q_z2     Quality flag for second spectrum (3)
 139-149  A11   ---     id2      Identification for second spectrum  (4)
 151-160  A10   "D/M/Y" date2    ?Date of observation for second spectrum (5)
 162-165  I4    ---     fld2     field and spectrograph for second spectrum (6)
 167-172  F6.2  ---     sn2      Signal-to-noise ratio for second spectrum (7)
 174-178  F5.3  ---     zprev    ?=0 Redshift if previously known (8)
 180-185  F6.1  mJy     F21cm    ?=0 Flux at 1.4GHz from NVSS (9)
 187-193  F7.4  mW/m2   FRASS    ?=0 Flux at 0.1-2.4keV x 10^-13 from RASS (10)
 195-199  F5.3  mag     E(B-V)   Reddening E(B-V) from Schegel et al. 1998 (11)

Note (1): In the case of an object having only an upper limit in the r-band,
    the bJ-r colour is defined as (bJ-rlim)-10. All r-band
    detections have bJ-r>-1.5 while this definition gives all upper
    limits bJ-r←9.8.
Note (2): The number of independent spectra taken.
    The highest quality spectrum is always spectrum 1.
Note (3): Both redshift and identification are given separate quality flags:
      1 for a high-quality identification or redshift
      2 for a low-quality identification or redshift
      3 for an unclassifiable identification or redshift
     The quality flag is set as
         identification quality x 10 + redshift quality
Note (4): There are six main classifications:
    QSO   for a spectrum with broad emission lines
    NELG  (narrow-emission line galaxy) for a spectrum with narrow
            emission lines
    gal   a galaxy spectrum with no emission lines
    star  a Galactic star spectrum
    cont  a high signal-to-noise (S/N>10) spectrum with no identifiable
            emission of absorption features
    ??    an unclassifiable spectrum
  Sub-classes are contained within parentheses after the main classifications:
    DA    a DA white dwarf
    DB    a DB white dwarf
    DO    a DO white dwarf
    DZ    a DZ white dwarf
    CV    a star with string hydrogen Balmer emission lines
    DAM   a DA white dwarf - M-dwarf binary
    DBM   a DB white dwarf - M-dwarf binary
    BAL   a broad absoprtion line QSO
  For example QSO(BAL), star(DA), star(CV).
  If the identification has a class 2 quality then there is a ?
    appended to the end of the identification.
Note (5): The date is given in the format dd/mm/yyyy.

Note (6): The 2dF field number (<1000) x 10 + the 2dF spectrograph number
     (1 or 2). e.g. field number 218 and spectrograph 2 gives 2182.
Note (7): Signal-to-noise calculated in a 400nm to 490nm band

Note (8): The previously known redshift is taken from:
     Quasars and Active Galactic Nuclei (9th Ed.) Veron-Cetty M.P.,
     Veron P., 2000, ESO Scientific Report 19, Cat. VII/215
Note (9): the 1.4GHz radio flux is taken from the  NRAO VLA Sky Survey (NVSS),
     Condon et al., 1998AJ....115.1693C, Cat. VIII/65
Note (10): The X-ray flux is taken from the ROSAT All Sky Survey, Voges et al.,
     1999A&A...349..389V, Cat. IX/10; Voges et al., 2000IAUC.7432R...1V.
     Counts/s in the 0.1 to 2.4keV band were converted to flux in
     erg/s/cm2 (or equivalently mW/m2) assuming a photon index of -2
     giving a conversion  factor of 5.6x10^-12.
Note (11): The reddening for a source is taken from Schlegel et al.,
     1998ApJ...500..525S


Author's address:
    Scott Croom 

References:
    Boyle et al., Paper I          2000MNRAS.317.1014B
(End)                                         Scott Croom [AAO]      04-Apr-2001