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J/A+AS/91/337    Steep spectrum radio spectra sources           (Soboleva+ 1991)
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A list of steep spectrum radio spectra sources
     Soboleva N.S., Temirova A.V., Reich. P.
    <Astron. Astrophys. Suppl. Ser. 91, 337 (1991)>
    =1991A&AS...91..337S
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ADC_Keywords: Radio sources
Keywords: radio sources - spectra of radio sources


Abstract:
   A comparison of three high-sensitivity catalogs of radio sources at meter
   and centimeter wavelengths, UTRAO (365 MHz), GB (4.85 GHz) and RC (3.94 GHz,
   has been made. As a result of this comparison the spectral index
   distribution for about 2000 UTRAO-GB objects in the declination strip of
   5 +/-2 deg was computed and a list of about 300 radio sources with a steep
   spectrum (alpha is greater than 1.1, S varies as nu exp alpha) was obtained.
   It is shown that the spectral index distributions of unresolved and double
   radio sources differ. The mean spectral indices for these two classes of
   objects also differ. A systematic shift in the coordinates between the
   catalogs (UTRAO-GB) was estimated to be about +1.2 s in right ascension and
   -14 arcsec in declination.

File Summary:
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 FileName    Lrecl    Records    Explanations
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ReadMe          80          .    This file
table2          36        299    A list of steep spectrum radio sources
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Byte-by-byte Description of file: table2
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   Bytes Format  Units   Label    Explanations
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   3-  6  F4.2   ---     alpha    Spectral index (S proportional to nu^(-alpha))
   8-  9  I2     h       RAh      Right ascension (1950)
  11- 12  I2     min     RAm      Right ascension (1950)
  14- 18  F5.2   s       RAs      Right ascension (1950)
  20- 21  I2     deg     DEd      Declination     (1950)
  23- 24  I2    arcmin   DEm      Declination     (1950)
  26- 27  I2    arcsec   DEs      Declination     (1950)
  29- 34  A6     ---     Rem      Further remarks (1)
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Note (1): Source parameters from the Texas radio source catalogue 
     (Douglas et al. 1980, Univ.Texas., Publ. 17):
      P: point source
      D: double source
     AD: asymetrical double
     strings like -1+1 refer to possible lobe shifts in the Texas catalogue

Historical Notes:
  * The catalogue was received on diskette in January 1993 at CDS;
    it was documented by Joseph Florsch [CDS] in June 1993.
  * The documentation was standardized at CDS in December 1995
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(End)                                         Joseph Florsch [CDS]   14-Jun-1993