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J/ApJS/107/239      327 MHz survey of the galactic plane  (Taylor+ 1996)
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A Westerbork synthesis radio telescope 327 MHz survey of the galactic plane.
     Taylor A.R., Goss W.M., Coleman P.H., van Leeuwen J., Wallace B.J.
    <Astrophys. J. Suppl. Ser. 107, 239 (1996)>
    =1996ApJS..107..239T
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ADC_Keywords: Radio sources ; H II regions
Keywords: HII regions - Planetary nebulae: general -
          radio continuum: general - surveys

Abstract (from the authors)
    The Westerbork Synthesis Radio Telescope (WSRT) in the Netherlands has
    been used to survey a section of the galactic plane at a radio
    frequency of 327MHz. Twenty-three overlapping synthesis fields were
    observed, covering galactic co-ordinates 43{deg}<l<91{deg},
    |b|<1.6{deg}. Each field was observed at two epochs, several years
    apart, to identify variable sources. Intensity data from the separate
    epochs were combined, and the resulting images mosaiced to produce a
    single image of the entire survey region. Sensitivity of the mosaic is
    typically a few mJy. Resolution is 1' by 1'cosec(dec).

    The survey image provides our first high resolution view of the Galaxy
    at low radio frequencies, and includes sections of the Sagittarius and
    Cygnus arms. These sections contain numerous extended features, among
    them supernova remnants, HII regions, "bubbles" of thermal emission,
    and large patches of amorphous galactic thermal emission. The
    inter-arm region is characterized by lower densities of extended
    features, but numerous discrete compact radio sources, most of which
    are background objects such as quasars and other types of active
    galactic nuclei. However, the resolution, sensitivity and low
    frequency of this survey make it ideal for detecting weak, non-thermal
    compact galactic sources, e.g. compact, low surface brightness SNRs
    and radio stars.

    Inspection of the survey image has produced a catalog of nearly 4000
    discrete sources with sizes less than about 3'.

File Summary:
--------------------------------------------------------------------------------
  FileName        Lrecl  Records   Explanations
--------------------------------------------------------------------------------
ReadMe             80        .   This file
wsrt.dat           84     3984   Catalogue of small diameter sources
table1.dat         79      120   IRAS identification
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See also:
    http://www.ras.ucalgary.ca/wsrt_survey.html : Images and FITS files

Byte-by-byte Description of file: wsrt.dat
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   Bytes Format Units    Label     Explanations
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   1- 11  A11   ---      Source    Name of source
  13- 14  I2    h        RAh       Right Ascension 1950 (hours)
  16- 17  I2    min      RAm       Right Ascension 1950 (minutes)
  19- 23  F5.2  s        RAs       [0,60] Right Ascension 1950 (seconds)
  26- 29  F4.2  s      e_RAs       Mean error on RA
      31  A1    ---      DE-       Declination 1950 (sign)
  32- 33  I2    deg      DEd       Declination 1950 (degrees)
  35- 36  I2    arcmin   DEm       Declination 1950 (minutes)
  38- 39  I2    arcsec   DEs       [0/60] Declination 1950 (seconds)
  41- 43  I3    arcsec e_DEs       Mean error on Declination
  45- 49  I5    mJy      S327      Flux density at 327MHz
  51- 54  I4    mJy    e_S327      Mean error on S327
      55  A1    ---      f1        [*] Flag when the source is in table1.dat
  57- 59  I3    arcsec   MajDiam   ? Diameter (major)
  61- 63  I3    arcsec   MinDiam   ? Diameter (minor)
  65- 67  I3    deg      PA        [0/180]? Position Angle
  69- 76  F8.4  deg      GLON      Galactic longitude
  77- 84  F8.4  deg      GLAT      Galactic latitude
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Byte-by-byte Description of file: table1.dat
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   Bytes Format Units   Label             Explanations
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   1- 10  A10   ---     Name              Name from IRAS position
  12- 15  F4.1  arcsec  Sep               Separation from radio position
  17- 20  I4    mJy     S327              Flux density at 327MHz
  22- 24  I3    mJy   e_S327              rms uncertainty on S327MHz
  26- 30  F5.1  Jy      S12um             Flux density at 12{mu}m
  32- 37  F6.1  Jy      S25um             Flux density at 25{mu}m
  39- 45  F7.1  Jy      S60um             Flux density at 60{mu}m
  47- 53  F7.1  Jy      S100um            Flux density at 100{mu}m
  55- 59  F5.2  ---     log(S25um/S12um)  S25um/S12um ratio
  61- 65  F5.2  ---     log(S60um/S25um)  S60um/S25um ratio
  67- 73  F7.1  ---     R                 S60um/S327MHz ration
  75- 79  F5.2  ---     SI                ? Radio spectral index
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History:
  * February 1997: wsrt.dat copied from
    http://www.ras.ucalgary.ca/wsrt/wsrt.cat in February
    and table1 supplied by Russ Taylor <russ@grizzly.ras.ucalgary.ca>
  * 20-May-2000 : errors in the units if IRAS fluxes corrected.
    Flag "f1" added in wsrt.dat (thanks to H. Andernach's remarks)
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(End)                                     Francois Ochsenbein [CDS]  25-Feb-1997