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J/AJ/118/1435     VLA FIRST survey quasar radio emission     (Wadadekar+, 1999)
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A study of quasar radio emission from the VLA FIRST survey
      Wadadekar Y., Kembhavi A.
     <Astron. J. 118, 1435 (1999)>
     =1999AJ....118.1435W
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ADC_Keywords: QSOs ; Radio continuum ; Redshifts ; Surveys
Keywords: catalogs - methods: statistical - quasars: general - surveys

Abstract:
    Using the most recent (1998) version of the VLA FIRST survey radio
    catalog, we have searched for radio emission from 1704 quasars taken
    from the most recent (1993, Cat. <II/158>) version of the Hewitt &
    Burbidge quasar catalog. These quasars lie in the roughly 5000 deg2 of
    sky already covered by the VLA FIRST survey. Our work has resulted in
    positive detection of radio emission from 389 quasars, of which 69
    quasars have been detected for the first time at radio wavelengths. We
    find no evidence of a correlation between optical and radio
    luminosities for optically selected quasars. We find indications of a
    bimodal distribution of radio luminosity, even at a low flux limit of
    1 mJy. We show that radio luminosity is a good discriminant between
    radio-loud and radio-quiet quasar populations, and that it may be
    inappropriate to make such a division on the basis of the
    radio-to-optical luminosity ratio. We discuss the dependence of the
    radio-loud fraction on optical luminosity and redshift.

File Summary:
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  FileName      Lrecl  Records   Explanations
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ReadMe             80        .   This file
table2.dat         91      436   FIRST detections of quasars
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See also:
    VIII/59 : the FIRST Survey, version 1999Jul (White+ 1999)
    http://sundog.stsci.edu : FIRST

Byte-by-byte Description of file: table2.dat
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   Bytes Format  Units   Label     Explanations
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   1-  8  A8     ---     Name     *IAU designation
  10- 12  A3     ---     Sel      *[ORCXU ] Selection technique
  14- 18  F5.2   mag     Pmag      ? Photographic magnitude
  20- 27  F8.2   mJy     F1.4GHz   1.4GHz peak radio flux
  29- 32  F4.2   ---     z         Redshift
  34- 36  F3.1   arcsec  Sep       Separation with the FIRST source
  38- 46  A9     ---     Names     Alternative designation
  48- 91  A44    ---     Radio     Recent radio detection
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Note on Name:
     The name is based on J2000 position, a 'J' should therefore
     be added in front of the name.

Note on Sel: the following symbols are used:
       O: objective prism
       R: radio
       C: UV-excess
       X: X-ray
       U: selection technique not mentioned
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History: From AJ electronic version
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(End)                           James Marcout, Patricia Bauer [CDS]  30-Nov-1999