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J/A+A/353/77  Variability & polarization of luminous quasars (Teerikorpi+, 2000)
Evidence for the class of the most luminous quasars.
II. Variability, polarization, and the gap in the MV distribution.
    Teerikorpi P.
   <Astron. Astrophys. 353, 77 (2000)>
   =2000A&A...353...77T
ADC_Keywords: QSOs ; Photometry, UBV ; Polarization

Keywords: galaxies: quasars: general


Abstract:
    We use 250 radio loud quasars with UBV photometry available and
    z<1.65, to study whether there is a gap in the distribution of
    absolute magnitudes, from MV~-25.8 (for H0=100km/s/Mpc, q0=0.5)
    to -25.3, as was suggested by Teerikorpi (1981A&A....98..309T; Paper
    I). In Paper I it was also proposed that there is a class of the most
    luminous radio quasars, differing in some properties from fainter
    quasars on the other side of the gap. The main conclusion of Paper I
    remains intact. The gap in the distribution of absolute magnitudes is
    confirmed with the new formalism of cosmological Malmquist bias
    (Teerikorpi, 1998A&A...339..647T), which allows one to use
    heterogeneous samples with magnitude inhomogeneity.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
tablec1.dat       91      254   Basic sample (Mmin←22.0mag)
refs.dat          82       57   References for variability


See also:
      J/A+A/321/123 : Optical variability of QSOs (Cristiani+ 1997)
     J/A+AS/143/357 : Tuorla Quasar Monitoring (Katajainen+ 2000)
    J/MNRAS/260/202 : Quasar luminosity function (Hawkins+, 1993)
    J/MNRAS/268/305 : Variability of optically selected quasars (Hook+ 1994)


Byte-by-byte Description of file: tablec1.dat

   Bytes Format Units   Label   Explanations

   1-  2  I2    h       RAh     Right ascension (1950)
   4-  5  I2    min     RAm     Right ascension (1950)
       7  A1    ---     DE-     Declination sign (1950)
   8-  9  I2    deg     DEd     Declination (1950)
  11- 12  I2    arcmin  DEm     Declination (1950)
  14- 18  F5.3  ---     z       Redshift
  20- 25  F6.2  mag     Mmin    Absolute V magnitude at minimum brightness
  27- 31  F5.2  mag     Vcat    Catalog V magnitude
  33- 36  F4.2  mag     B-V     B-V colour index
  38- 40  F3.1  mag     Dm      ? Variability amplitude
      42  I1    ---     Var     [0-3] Variability code (1)
  44- 48  F5.2  mag     Vmin    Minimum V magnitude
  50- 54  A5    ---     Note    Notes on photometry (2)
  56- 67  A12   ---     r_Var   Comma-separated references for variability (3)
  69- 73  F5.2  %       Pol     ? Optical polarisation
  75- 78  F4.2  %       e_Pol   ? rms uncertainty on Pol
  80- 91  A12   ---     r_Pol   Comma-separated reference for polarisation (3)

Note (1): 0: none - 3: good

Note (2): Notes:
           1: averages for B-V and/or V
           2: Vmin estimated from photographic light-curve in B
               or from ITS counts
           3: Vmin originally estimated from the PSA
           4: δm from |Vcat-Vlightcurve| (4! problematic)
Note (3): See refs.dat file



Byte-by-byte Description of file: refs.dat

   Bytes Format Units   Label     Explanations

   1-  4  A4    ---     Ref       Reference number
   6- 24  A19   ---     Bibcode   Bibcode
  26- 47  A22   ---     Aut       Author's name
  49- 82  A34   ---     Com       Comments


History: Prepared via OCR at CDS.


References:
     Teerikorpi, Paper Ia      1981A&A....98..300T
     Teerikorpi, Paper I       1981A&A....98..309T
(End)                         James Marcout, Patricia Bauer [CDS]    31-May-2000