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J/ApJS/155/89       325MHz radio survey in M31                 (Gelfand+, 2004)
A wide-field, low-frequency radio survey of the field of M31.
I. Construction and statistical analysis of the source catalog.
    Gelfand J.D., Lazio T.J.W., Gaensler B.M.
   <Astrophys. J. Suppl. Ser., 155, 89-100 (2004)>
   =2004ApJS..155...89G
ADC_Keywords: Surveys ; Radio continuum ; Radio sources

Keywords: catalogs - galaxies: individual (M31) - radio continuum: galaxies -
          radio continuum: general

Abstract:
    We present here the results of a 325MHz radio survey of M31, conducted
    with the A configuration of the Very Large Array. The survey covered
    an area of 7.6°2, and a total of 405 radio sources between ≲6"
    and 170" in extent were mapped with a resolution of 6" and a 1σ
    sensitivity of ∼0.6mJy/beam. For each source, its morphological class,
    major axis θM, minor axis θm, position angle
    θPA, peak flux I, integrated flux density S, spectral index
    α, and spectral curvature parameter φ were calculated.

Description:
    This paper is the result of a 5hr (4hr on-source) observation of M31
    conducted on 2000 December 15 with the VLA A configuration.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
table3.dat       148      405   GLG source list


See also:
  J/A+AS/61/451  : The 37W catalogue of radio sources in M31 (Walterbos+ 1985)


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

   Bytes Format Units    Label    Explanations

   1-  3  A3    ---      ---      [GLG]
   4-  6  I3    ---      GLG      Source name (1)
   8- 10  A3    ---      Type     Morphological category (2)
  12- 13  I2    h        RAh      Hour of Right Ascension (J2000)
  15- 16  I2    min      RAm      Minute of Right Ascension (J2000)
  18- 22  F5.2  s        RAs      Second of Right Ascension (J2000)
  24- 27  F4.2  arcsec   e_RAs    Error in RAs
      29  A1    ---      DE-      Sign of the Declination (J2000)
  30- 31  I2    deg      DEd      Degree of Declination (J2000)
  33- 34  I2    arcmin   DEm      Arcminute of Declination (J2000)
  36- 40  F5.2  arcsec   DEs      Arcsecond of Declination (J2000)
  42- 45  F4.2  arcsec   e_DEs    Error in DEs
  47- 50  F4.1  arcmin   Theta    Angular distance from the center of M31
  52- 55  F4.1  kpc      Rad      Projected radius of source in M31 (3)
  57- 60  F4.1  arcsec   MajAxis  Source major axis
  62- 65  F4.1  arcsec e_MajAxis  Error in MajAxis
  67- 70  F4.1  arcsec   MinAxis  Source minor axis
  72- 75  F4.1  arcsec e_MinAxis  Error in MinAxis
  77- 79  I3    deg      PA       [-90,90] Position Angle (4)
  81- 84  I4    deg      e_PA     Error in PA
  86- 92  F7.2  mJy      I325MHz  Peak brightness at 325MHz in units of mJy/beam
  94- 99  F6.2  mJy    e_I325MHz  Error in I325MHz
 101-107  F7.2  mJy      S325MHz  Integrated flux density at 325MHz
 109-114  F6.2  mJy    e_S325MHz  Error in S325MHz
 116-120  F5.2  mJy      RMS      RMS of the flux density around the source
 122-125  A4    ---   l_Sp+Index  [≤] Limit flag on Sp+Index
 126-130  F5.2  ---     Sp+Index  ? Radio spectral index (5)
 132-135  F4.2  ---   e_Sp+Index  ? Error in Sp+Index
 137-141  F5.2  ---      phi      ? Spectral curvature parameter (5)
 143-146  F4.2  ---      e_phi    ? Error in phi

Note (1): In increasing distance from the center of the FOV.

Note (2): Morphological category, defined as follows:
    U   = unresolved;
    El  = elongated;
    C   = complex;
    Ex  = extended;
    ExG = Extended source with a counterpart in one or more other radio
          surveys of M31.
Note (3): Projected radius of source in M31 defined in Section 4.1.

Note (4): Position angle North through East of the source.

Note (5): As calculated in Section 4.3.



History:
    From electronic version of the journal
(End)                   Greg Schwarz [AAS], Marianne Brouty [CDS]    09-May-2005