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VIII/20     Cat of 5 GHz Galactic Plane Sources (Haynes+ 1979)
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A Catalogue of 5 GHz Galactic Plane Sources
    Haynes R.F., Caswell J.L., Simons L.W.J.
     <Aust. J. Phys. Astrophys. Suppl 48, 1 (1979)>
     =1979AuJPA..48....1H
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ADC_Keywords: Galactic plane; Radio sources

Description:
  This is a catalog of 915 sources in the galactic plane between 
  l=190 - 360 - 40 for -2 < b < 2. The l, b pair of galactic 
  coordinates is given in columns 1 and 2 and essentially 
  constitutes the galactic source name. The 1950 equatorial 
  coordinates for each source are given in columns 3 and 4, and
  values for the peak brightness temperature and flux density are 
  given in columns 5 and 6. The reader should refer to Section 3 
  of the source reference for information relating to the 
  determination of the flux densities.  Column 7 gives an estimate 
  of the source extension in minutes of arc. Extents are given for 
  source in nonconfused regions only.  Finally, in column 8 
  comments on each source are included where appropriate. 
  Identifications with known supernova remnants are included from 
  the compilation of Clark and Caswell (1976).  Identifications 
  with HII regions are based principally on H109alpha
  recombination-line emission data, which are mostly obtained from
  Wilson et al. (1970) but with some unpublished Parkes observations
  included also. 
  
File Summary:
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 FileName       Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1.dat         72      915   915 radio sources in the galactic plane
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See also:
   J/A+AS/35/23 : Survey of the Galactic Plane at 4.875 GHz (Altenhoff+ 1979)

Byte-by-byte Description of file: table1.dat 
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   Bytes  Format   Units   Label    Explanations
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   1-  7   F7.3    deg     GLON     Galactic longitude
  10- 16   F7.3    deg     GLAT     Galactic latitude
  19- 20   I2      h       RAh      Right Ascension 1950 (hours)
  22- 23   I2      min     RAm      Right Ascension 1950 (minutes)
  25- 28   F4.1    s       RAs      Right Ascension 1950 (seconds)
      31   A1      ---     DE-      Declination 1950 (sign)
  32- 33   I2      deg     DEd      Declination 1950 (degrees)
  35- 36   I2      arcmin  DEm      Declination 1950 (minutes)
  38- 41   F4.1    arcsec  DEs      Declination 1950 (seconds)
  44- 48   F5.2    K       Tb       Peak brightness temperature
  51- 55   F5.2    Jy      S       *? Flux density 
  58- 59   I2      arcmin  dim1     ? Extent (first dimension) or dim1
      60   A1      ---     x        [x ] 'x' for dim1 x dim2
  61- 62   I2      arcmin  dim2     ? Extent (second dimension) or dim2
  66- 72   A7      ---     Com     *Identification Comment
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Note on Com:
  Identifications with known supernova remnants (SNR) from the compilation
  of Clark and Caswell (1976); identifications with HII regions mostly from
  Wilson et al. (1970). Abbreviations- C = Compact; E = Extended; PA= Part.

Note on S:
  The source flux densities given in table1 were determined by estimating
  the mean of the beam brightness temperatures at the four points spaced
  at one-half of the half-power beamwidth from each nominal source
  position. The quoted flux density is double the difference between this
  mean and the peak observed source brightness (with appropriate scaling,
  that is x1.3, from beam temperature to janskys). In the calculation, the
  assumption was made that the source is a point source. This technique
  results in a good estimate for point sources even where there are
  several nearby sources or a confused background. However, many of the
  sources are clearly extended. We have not attempt to estimate integrated
  flux densities for these objects; thus the catalogued flux densities are
  correct only for those apparently 'point-like' radio sources. We
  strongly urge that the catalogue be used only in close conjunction with
  the maps; they alone can provide an adequate description of complex
  regions. The angular size, when quoted in the table, refers to the full
  width of the source measured in the galactic longitude and latitude
  directions. It is intended only as a rough indication for sources much
  broader than the beam size; in very confused regions no attempt was
  made to assess the sizes of component sources. 

Remarks:
   The detection of sources from the survey maps was made using an automatic
   search routine with the CSIRO Cyber 76 computing system. Maps were held
   using the NOD-2 format (see Haslam 1974,1975) in machine readable form.
   Each map was systematically searched for sources above the background level
   equivalent to a main beam brightness temperature of 0.4 K. The initial
   search for sources consisted of identifying those grid points in the map
   which exceed the mean of the four adjacent surrounding points by a
   nominal 0.1 K (grid point are at the Nyquist sample interval).
   Subsequently, the 'rough' position and flux density were refined by a
   source-fitting technique. The fitting procedure involved using a 16-point
   beam, function, where the appropriate weighting for each grid point
   permitted the program to interpolate to the best position for the peak
   of the source while taking into account nearby galactic features. The
   beam-fitting procedure was used either side (alternating between right
   ascension and declination) of the nominal position to obtain the best
   estimate of the position of each source. The resulting positions 
   have an accuracy comparable to the overall positional accuracy of the
   survey (30" arc). Peak main beam brightness temperatures (determined by
   fitting the 16-point beam response function at the deduced nominal
   position) are also accurate to within the survey accuracy. Sources with
   a peak beam brightness temperature of at least 0.2 K above the
   background are included, except in confused regions; a point source of
   0.2 K corresponds to 0.26 Jy. 

Acknowledgements:
  The original CDS documentation by M.J. Wagner, F. Ochsenbein (1993)
  was included in this ReadMe file.

References:
   Clark, D.H., and Caswell, J.L. (1974). Mon. Not. Astron. Soc. 174, 267.
   Haslam, C.G.T. (1974). Astron. Astrophys. 15, 333.
   Haslam, C.G.T. (1975). Proc. Astron. Soc. Aust. 2, 331.
   Haynes, R.F., Caswell, J.L., and Simons, L.W. (1978).
                 Aust. J. Phys. Astrophys. Suppl. No 45, 1.
   Wilson, T.L., Mezger, P.G., Gardner, F.F., and Milne, D.K. (1970).
                 Astron. Astrophys. 6, 364.
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(End) M.J.Wagner, F. Ochsenbein [CDS];  C.-H. Lyu [Hughes STX/NASA]  08-Apr-1996