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J/MNRAS/247/182          Catalogue of quasar candidates      (Beauchemin+, 1990)
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A homogeneous catalogue of quasar candidates found with slitless spectroscopy
     Beauchemin M., Borra E.F., Edwards G.
    <Mon. Not. R. Astron. Soc. 247, 182 (1990)>
    =1990MNRAS.247..182B      (SIMBAD/NED Reference)
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ADC_Keywords: QSOs; Spectroscopy

Abstract:
   This paper gives a list of all quasar candidates obtained from an
   automated computer search performed on 11 grens plates. The description
   of the main characteristics of the survey is given along with the
   latest improvements in the selection techniques. Particular attention
   has been paid to understanding and quantifying selection effects.
   This allows the construction of homogeneous samples having
   well-understood characteristics. The noteworthy aspect of our
   homogenization process is the correction that we apply to our
   probability classes in order to take into account the signal-to-noise
   differences; at a given magnitude, among plates of different limiting
   magnitudes. Since such homogeneous material is rare, this catalogue
   is of general interest. Each grens plate covers about 1 square degree
   with typical limiting magnitude of B~21. Data are given with all
   relevant quantities needed to understand the characteristics of the
   survey. We expect that over 100 of the 125 higher probability class
   candidates are quasars. A third of the ~400 lower probability
   objects should also be quasars. This material is well-suited to
   follow-up spectroscopy with fibre spectrographs.

File Summary:
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 FileName       Lrecl  Records   Explanations
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ReadMe             80        .   This file
table5.dat         90      758   Catalogue of quasar candidates
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Byte-by-byte Description of file: table5.dat
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   Bytes Format  Units   Label    Explanations
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   1-  4  A4     ---     Field    Field name
   6-  9  I4     ---     Id       Grens reference number inside the field
  11- 12  I2     h       RAh      Right ascension 1950
  14- 15  I2     min     RAm      Right ascension 1950
  17- 21  F5.2   s       RAs      Right ascension 1950
      23  A1     ---     DE-      Declination sign
  24- 25  I2     deg     DEd      Declination 1950
  27- 28  I2     arcmin  DEm      Declination 1950
  30- 33  F4.1   arcsec  DEs      Declination 1950
  34- 35  A2     ---   u_DEs      [* ] Uncertainty flag on DE (1)
  37- 41  F5.2   mag     Jmag     J magnitude
      43  I1     ---     PrClass  Probability class (2)
  45- 49  F5.2   mag     gb-gv    gb-gv grens colour index
  51- 55  F5.2   mag     gu-gb    gu-gb grens colour index
      59  I1     ---     Dms      Distance of the candidate from the nominal
                                   locus of the main sequence of stars (3)
  63- 69  A7     ---     Sample   Sample membership of the candidate
  72- 81  A10    0.1nm   EmLine   Wavelength of the emission lines detected on
                                   grens plates for the highest probability
                                   classes candidates PC1
      83  A1     ---     Type     [QS] Object type of some candidates (4)
  86- 90  F5.3   ---     z        []? Emmision line redshift confirmed by
                                       slit spectroscopy
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Note (1):  *: Astrometry accurate to 0.6 arcsec
          **: Astrometry accurate to about 3 arcsec (evaluated on grens plates)
Note (2): 1: line s/n > 8 or 2 lines with s/n > 5 separated by at least 600 A
          2: 6 < line s/n < 8
          3: 5 < line s/n < 6 and colours more than 1 sigma away from the
             stellar main-sequence
          4: no line and unusual colours (colour indices more than 2 standard
              deviations away from the stellas main-sequence locus)
Note (3): 0: the distance is between 0 and 1 standard deviation
          1: the distance is between 1 and 2 standard deviations
          2: the distance is between 2 and 3 standard deviations
          3: the distance is greater than 3 standard deviations
Note (4): Q = quasar, S = star
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(End)                      Marie-Jose Wagner, Patricia Bauer [CDS]   20-Jan-1995