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J/MNRAS/275/1102    Evolution of quasar luminosity function (Hawkins+ 1995)
The evolution of the quasar luminosity function
     Hawkins M.R.S., Veron P.
    <Mon. Not. R. Astron. Soc. 275, 1102 (1995)>
    =1995MNRAS.275.1102H      (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Magnitudes ; Redshifts

Keywords: galaxies: luminosity function, mass function - quasars: general


Abstract:
    In an earlier paper (Hawkins & Veron, 1993MNRAS.260..202H) we
    presented quasar luminosity functions in three redshift bins, derived
    from a variability selected sample. Here we provide a major extension
    to this survey, with a view to improving statistics and completeness,
    and extending the redshift range. The luminosity functions for
    redshifts of less than 2.2 show a featureless power law of the form
    φ=10β(M-M0_)^, with no sign of a 'break'. The quasar
    luminosity function is also derived by the redshift range 2.2<z<3.2,
    which again shows a featureless power law, but with a steeper slope.
    When the data are combined with a new sample of bright quasars, the
    quasar luminosity functions in all four redshift ranges are consistent
    with a single power law of index β=0.63. Plots of quasar space
    density as a function of redshift in three luminosity bins are also
    presented and show strong evolution at low redshift but nearly
    constant space density beyond a redshift of 2.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table1a           59      111   Quasars in the fibre field sample
table1b           58      117   Quasars in the bright sample
table1c           58       86   Quasars in the high-redshift sample


See also:
   J/MNRAS/260/202 : Quasar luminosity function (Hawkins+, 1993)


Byte-by-byte Description of file: table1a table1b table1c

   Bytes Format Units   Label     Explanations

   1-  3  I3    ---     No        Quasar number
   5-  6  I2    h       RAh       Right ascension (1950)
   8-  9  I2    min     RAm       Right ascension (1950)
  11- 15  F5.2  s       RAs       Right ascension (1950)
      17  A1    ---     DE-       Declination sign
  18- 19  I2    deg     DEd       Declination (1950)
  21- 22  I2    arcmin  DEm       Declination (1950)
  24- 27  F4.1  arcsec  DEs       Declination (1950)
  29- 33  F5.2  mag     Bmag      B magnitude in 1977
  35- 39  F5.2  mag     U-B       ? U-B color index
  41- 45  F5.2  ---     s         Variability parameter (1)
  47- 51  F5.3  ---     z         Redshift
  53- 58  F6.2  mag     BMag      Absolute B magnitude in 1977

Note (1): The variability parameter s measures the significance of variability
           and is typically 10 times the amplitude of variation.


History: Prepared via OCR at CDS.

(End)                           James Marcout, Patricia Bauer [CDS]  18-Feb-1997