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J/ApJS/81/83  Compendium of Radio Spectra and Luminosities        (Herbig+ 1992)
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Compendium of Radio Spectra and Luminosities for three complete samples of 
Radio Sources
   Herbig T., Readhead A.C.S.
   <Astrophys. J. Suppl. 81, 83 (1992)>
   =1992ApJS...81...83H
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ADC_Keywords: Radio sources ; Redshifts

Description:
   This catalog is a complete sample of 256 powerful extragalactic radio
   sources. The catalog includes source idenfification, redshift, luminosities
   and spectral indices at standard rest frequencies as well as bolometric 
   luminosities between emitted frequencies of 10 MHz and 100 GHz. The paper 
   also includes fits to the measured radio spectra which have not been 
   included in this catalog.  
 
File Summary: 
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  FileName    Lrecl   Records    Explanation   
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ReadMe           80         .    This file
table1.dat       88       256    Table 1 of Herbig & Readhead 1992, ApJS 81, 83
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Byte-by-byte description of file: table1.dat
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  Bytes   Format   Units   Labels  Explanation
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 1- 8     A8       ---     IAUname  IAU name of the object.
10-16     A7       ---     name     Other common name.
19-24     F6.4     ---     z        Redshift of the object.
25        A1       ---     n_z     * [* ] * means Estimated redshifts
26-32     E7.2     W/Hz    P_150   * Emitted Luminosity at 150 MHz
34-40     E7.2     W/Hz    P_2500  * Emitted Luminosity at 2.5 GHz
42-48     E7.2     W/Hz    P_4000  * Emitted Luminosity at 40 GHz
50-56     E7.2      W      Pbol    * Emitted bolometric luminosities 
59-63     F5.2     ---     alph150  Spectral index (S ~ nu^alpha at 150MHz)
66-70     F5.2     ---     alph2500 Spectral index at 2.5 GHz
73-77     F5.2     ---     alph4000 Spectral index at 40 GHz
79-82     F4.1     ---      phi    * Spline fitting parameter
84-86     A3       ---      mem    * [ABC ] Sample membership
87-88     A2       ---      r_z    * References to redshifts
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Note on n_z:
  For 18 of the sources no redshifts were available. For Sources with 
  optical identifications but no reliable published redshifts, these were 
  estimated from their apparent optical magnitudes. In the case of five
  sources not identified optically, a redshift of 1 was assumed. The 
  redshift of these sources has been flagged with a * in this field.
Note on P_150, P_2500, P_4000, Pbol, phi:
  Emitted specific luminosities at the emitted frequencies shown for a 
  value of the Hubble constant of Ho = 100 h km/s/Mpc. The values scale 
  with (H/Ho)^-2. To estimate the fluxdensities measured data points 
  were interpolated with a cubic spline fit to the observed flux densities.
  Most fits were made in the log S(nu) - log (nu) plane. Closeness of the 
  spline fit was adjusted by eye with the parameter phi. Specific 
  luminosities were evaluated at the satndard frequencies for a universe 
  with qo=0.5 and Lambda=0. The bolometric luminosities were calculated 
  from the spline fits. To extrapolate to the limits of the band the spectra
  were extended as power laws from the endpoints of the spline fits. 
Note on mem:
   (A) revised 3CR survey of Laing et al. 1983 (LRL) 
   (B) survey of Peacock and Wall 1981 (PW)
   (C) VLBI sample of Pearson and Readhead 1988 (PR).
Note on r_z:
   (1) Laing et al. 1983
   (2) Pearson and Readhead 1988
   (3) Peacock and Wall 1981
   (4) Riley, priv. comm.
   (5) Lawrence, priv. comm.
   (6) Xu, priv. comm.
   (7) Murphy 1988
   (8) Veron and Veron 1981
   (9) Spencer et al. 1989
   (10) Hewitt and Burbidge 1987.
   A blank in this column indicates that no reliable redshift is
   available.
   The sources designated as "U" are not identified optically.

References:
  Hewitt,A. and Burbridge, G. 1987, ApJS 63, 1
  Laing, R.A., Riley,J.M. amd Longhair,M.S. 1983, MNRAS 204, 151.
  Murphy, D. 1988, PhD Thesis, Un. of Manchester
  Peacock, J.A. and Wall, J.V. 1981, MNRAS 194, 331.
  Pearson, T.J. and Readhead, A.C.S. 1988, ApJ 328, 114.
  Spencer, R.E., McDowell, J.C., Charlesworth, M., Franti, C., 
    Parma, P. and Peacock, J.A. 1989, MNRAS 240, 657. 
  Veron-Cetty, M.P. and Veron, P. 1991, ESO Scientific Rep., No. 10

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(End)           N.P.M. Kuin (ADC/SSDOO/NASA)                         14-Feb-1995