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J/A+AS/143/465          Quasar variability                    (Hawkins+, 2000)
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Quasar variability: Correlations with amplitude.
    Hawkins M.R.S.
   <Astron. Astrophys. Suppl. Ser. 143, 465 (2000)>
   =2000A&AS..143..465H
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ADC_Keywords: QSOs ; Photometry, UBV ; Redshifts
Keywords: quasars: general

Abstract:
    The relation between quasar variability and parameters such as
    luminosity and redshift has been a matter of hot debate over the last
    few years with many papers on the subject. Any correlations which can
    be established will have a profound effect on models of quasar
    structure and evolution. The sample of quasars with redshifts in
    ESO/SERC field 287 contains over 600 quasars in the range 0<z<3.5 and
    is now large enough to bin in luminosity and redshift, and give
    definitive measures of the correlations. We find no significant
    correlation between amplitude and redshift, except perhaps at very low
    redshift, but an inverse correlation between amplitude and luminosity.
    This is examined in the context of various models for quasar
    variability.

File Summary:
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 FileName      Lrecl  Records   Explanations
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ReadMe            80        .   This file
appen.dat         62      385   Details of all three samples
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Byte-by-byte Description of file: appen.dat
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   Bytes Format Units   Label     Explanations
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   1-  2  I2    h       RAh       Right ascension (1950)
   4-  5  I2    min     RAm       Right ascension (1950)
   7- 11  F5.2  s       RAs       Right ascension (1950)
      13  A1    ---     DE-       Declination sign (1950)
  14- 15  I2    deg     DEd       Declination (1950)
  17- 18  I2    arcmin  DEm       Declination (1950)
  20- 23  F4.1  arcsec  DEs       [0,60] Declination (1950)
  25- 29  F5.2  mag     Bmag      B magnitude
  31- 35  F5.2  mag     U-B       U-B colour index
  37- 40  F4.2  mag     dmag      Magnitude amplitude (1)
  42- 46  F5.3  ---     z         Redshift
  48- 53  F6.2  mag     BMag      Absolute B magnitude
      56  I1    ---     S1        [0/1] 1: QSO belongs to VAR sample
      59  I1    ---     S2        [0/2] 2: QSO belongs to UVX sample
      62  I1    ---     S3        [0/3] 3: QSO belongs to AMP sample
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Note (1): The amplitude is the difference between maximum and minimum
     magnitude achieved over the 20 year run of data
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History: From A&AS electronic version
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(End)                                        Patricia Bauer [CDS]    29-May-2000