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J/A+AS/61/451       The 37W catalogue of radio sources in M31  (Walterbos+ 1985)
A high resolution radio continuum survey of Messier 31. II.
Observations at 1412 MHz, data reduction and the 37W catalogue of radio sources.
    Walterbos R.A.M., Brinks E., Shane W.W.
   <Astron. Astrophys. Suppl. Ser. 61, 451 (1985)>
   =1985A&AS...61..451W
ADC_Keywords: Radio sources

Keywords: galaxies: M 31 - radio continuum radiation - radios sources -
          source counts

Abstract:
    The radio continuum emission of the spiral galaxy M31 has been mapped
    at a wavelength of 21cm with the Westerbork Synthesis Radio Telescope,
    at an angular resolution of 23"x35", corresponding to a linear
    resolution of 70x115pc. Five fields have been observed which, when
    combined, cover the main part of the disk of M31. A catalogue of
    sources inside the M31 area with a flux density larger than 1mJy (five
    times the rms noise) is presented.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       116      269   The 37W catalogue of radio sources at 1412MHz
                               (269  entries for 249 sources)


See also:
   J/A+A/373/63 : M31 second ROSAT PSPC survey (Supper+, 2001)


Table 1: Observational data
--------------------------------------------------------------------------------
 Field     Field centre  Freq BandWidth   Observation date
             (1950.0)
--------------------------------------------------------------------------------
 C      00 40 00 +41 00  1412   10         01-08/1975 12/1978 07/1979
                        (1415)  (4) (for a few baselines)
 NW     00 40 30 +41 40  1412   10         12/1978    07-08/1979
 NE     00 43 18 +41 16  1415    4         06-08/1975
 SW     00 36 42 +40 44  1412   10         07-09/1978
 SE     00 39 30 +40 20  1412   10         07-09/1978

Byte-by-byte Description of file: table3.dat

   Bytes Format Units    Label     Explanations

   1-  6  A6    ---      Name      Radio source designation (37WNNN)
       7  A1    ----     m_Name    [ABC*] Multiplicity index on Name (1)
      10  A1    ---      Type      [CDETU] Structure type (2)
  12- 13  I2    h        RAh       Right ascension (B1950.0)
  15- 16  I2    min      RAm       Right ascension (B1950.0)
  18- 22  F5.2  s        RAs       Right ascension (B1950.0)
  24- 26  F3.2  s        e_RAs     ? rms uncertainty on RA
      28  A1    ---      DE-       Declination sign (B1950.0)
  29- 30  I2    deg      DEd       Declination (B1950.0)
  32- 33  I2    arcmin   DEm       Declination (B1950.0)
  35- 38  F4.1  arcsec   DEs       Declination (B1950.0)
  40- 42  F3.1  arcsec   e_DEs     ? rms uncertainty on DE
  45- 49  F5.1  mJy      S1412MHz  ? Peak flux density at 1412MHz, corrected for
                                      primary beam attenuation
      50  A1    ---    n_S1412MHz  [*] If *, flux at 1415MHz
  52- 55  F4.1  mJy    e_S1412MHz  ? rms uncertainty on S1412MHz
  57- 62  F6.3  ---      PBatt     Primary beam attenuation factor at the
                                    position of the source, relative to closest
                                    of the five field centres
  65- 67  I3    arcsec   MajAxis   ? Major axis (corrected for the beam)
  69- 71  I3    arcsec   MinAxis   ? Minor axis (corrected for the beam) (3)
  73- 75  I3    deg      PA        ? Position angle along major axis,
                                      measured North through East
  77- 81  F5.1  mJy      I1412MHz  ? Integrated flux density at 1412MHz,
                                      corrected for primary beam attenuation
  84- 86  F3.1  mJy    e_I1412MHz  ? rms uncertainty on I1412MHz
  89- 95  A7    ---      36W       36W name, Bystedt et al., 1984A&AS...56..245B
  97-104  A8    ---      5C        5C3 name (Pooley, 1969MNRAS.144..101P) or KK,
                                    Van der Kruit & Katgert, 1972ApJ....11L.181V
 107-116  A10   ---      Notes     Notes (4)

Note (1): Multi-components sources are marked with an asterisk,
    and their components are lettered consecutively.
Note (2): Structure:
     U: unresolved
     E: extended
     D: double
     T: triple
     C: complex
Note (3): Sources resolved in only one direction have minor axis size equal to 0

Note (4): Notes:
     C: confused. No exact correspondence is found between the 37W and the
        36W source because of confusion at 49cm (36W)
    NS: source not subtracted form maps (see Sect. 5)
    Extended? : source suspected of being extended from residuals visible
        in the map after subtraction of an unresolved source.


History:
    Prepared by Heinz Andernach (R302 in his list)

References:
   Bystedt et al., Paper I      1984A&AS...56..245B
(End)                                       Patricia Bauer  [CDS]    05-Aug-2002