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J/MNRAS/402/2403 Australia Telescope 20GHz Survey Catalog, AT20G (Murphy+, 2010)
The Australia Telescope 20GHz Survey (AT20G), Version XX October 2009.
    Murphy T., Sadler E.M., Ekers R.D., Massardi M., Hancock P.J., Mahony E.,
    Ricci R., Burke-Spolaor S., Calabretta M., Chhetri R., De Zotti G.,
    Edwards P.G., Ekers J.A., Jackson C.A., Kesteven M.J., Lindley E.,
    Newton-McGee K., Phillips C., Roberts P., Sault R.J., Staveley-Smith L.,
    Subrahmanyan R., Walker M.A., Wilson W.E.
   <Mon. Not. R. Astron. Soc. 402, 2403 (2010)>
   =2010MNRAS.402.2403M
ADC_Keywords: Surveys ; Radio sources ; Surveys ; Radio continuum ; Polarization

Keywords: methods: data analysis - catalogues - surveys - galaxies: active -
          cosmic microwave background - radio continuum: general -

Description:
    The Australia Telescope 20GHz Survey (AT20G) is a blind radio survey
    carried out at 20GHz with the Australia Telescope Compact Array
    (ATCA) from 2004 to 2008, and covers the whole sky south of
    declination 0°. The AT20G source catalogue presented here 
    is an order of magnitude larger than any previous catalogue of
    high-frequency radio sources, and includes 5890 sources above a 20GHz
    flux-density limit of 40mJy. All AT20G sources have total intensity
    and polarisation measured at 20GHz, and most sources south of
    declination -15° also have near-simultaneous flux-density
    measurements at 5 and 8GHz. A total of 1559 sources were detected in
    polarised total intensity at one or more of the three frequencies.

File Summary:

       FileName      Lrecl  Records   Explanations

ReadMe            80        .   This file
at20gcat.dat     142     5890   The AT20G catalogue, version 1.0 (2009-10-15)


See also:
   J/MNRAS/384/775 : Bright Source Sample of AT20G Survey (Massardi+, 2008)


Byte-by-byte Description of file: at20gcat.dat

   Bytes Format Units   Label    Explanations

   1-  5  A5    ---     ---      [AT20G]
   6- 19  A14   ---     AT20G    IAU designation (JHHMMSS+DDMMSS)
  21- 22  I2    h       RAh      Right Ascension J2000 (hours) (1)
  24- 25  I2    min     RAm      Right Ascension J2000 (minutes) (1)
  27- 31  F5.2  s       RAs      Right Ascension J2000 (seconds) (1)
      33  A1    ---     DE-      Declination J2000 (sign) (2)
  34- 35  I2    deg     DEd      Declination J2000 (degrees) (2)
  37- 38  I2    arcmin  DEm      Declination J2000 (minutes) (2)
  40- 43  F4.1  arcsec  DEs      Declination J2000 (seconds) (2)
  45- 49  I5    mJy     S20      ?=- Peak brightness at 20GHz (in mJy/beam) (3)
  51- 53  I3    mJy     e_S20    ?=- Uncertainty on S20
  56- 59  I4    mJy     S8       ?=- Peak brightness at 8GHz (in mJy/beam) (3)
  61- 63  I3    mJy     e_S8     ?=- Uncertainty on S8
  65- 69  I5    mJy     S5       ?=- Peak brightness at 5GHz (in mJy/beam) (3)
  71- 73  I3    mJy     e_S5     ?=- Uncertainty on S5
  75- 77  A3    ---     Ep       [1-8.] Epochs of observation at 20, 8, 5GHz (4)
      79  A1    ---     Q        [gp] Quality flag (g=good or p=poor)
  81- 83  A3    ---     Flags    Other flags (5)
      85  A1    ---     l_P20    Limit flag on P20
  86- 89  I4    mJy     P20      ?=- Polarized flux density (or limit) at 20GHz
  91- 92  I2    mJy     e_P20    ?=- Uncertainty on P20
      94  A1    ---     l_m20    Limit flag on m20
  95- 98  F4.1  %       m20      ?=- Fractional polarisation at 20GHz
 100-102  I3    deg     PA20     [-90/90]?=- Position angle at 20GHz
     105  A1    ---     l_P8     Limit flag on P8
 106-108  I3    mJy     P8       ?=- Polarized flux density (or limit) at 8GHz
 110-111  I2    mJy     e_P8     ?=- Uncertainty on P8
     113  A1    ---     l_m8     Limit flag on m8
 114-118  F5.1  %       m8       ?=- Fractional polarisation at 8GHz
 120-122  I3    deg     PA8      [-90/90]?=- Position angle at 8GHz
     124  A1    ---     l_P5     Limit flag on P5
 125-128  I4    mJy     P5       ?=- Polarized flux density (or limit) at 5GHz
     131  I1    mJy     e_P5     ?=- Uncertainty on P5
     133  A1    ---     l_m5     Limit flag on m5
 134-138  F5.1  %       m5       ?=- Fractional polarisation at 5GHz
 140-142  I3    deg     PA5      [-90/90]?=- Position angle at 5GHz

Note (1): The mean uncertainty in RA is 0.9 arcsec. See Sec 4.1 of the paper.

Note (2): The mean uncertainty in Dec is 1.0 arcsec. See Sec 4.1 of the paper.

Note (3): See Sec 3.3.2 for calculation of fluxes for extended sources.

Note (4): The 3 digits give the epoch code for the 3 frequencies (more
     details in Table 3 of the paper):
  ---------------------------------------------------------------------------
  #  Dec.     Freq1 Freq2  Array  Beam1     Beam2       Dates            Rem.
     (deg)       (MHz)     Conf.     (arcsec)
  ---------------------------------------------------------------------------
  1 −50/−30   18752  21056  H214 10.8x10.8            2004 Oct 21–27     C
  1 −50/−30    4800   8640  1.5C  8.3x12.8  4.6x7.13  2004 Nov 04–08     O
  2 −90/−50   18752  21056  H168 13.9x13.9            2005 Oct 27–31     C  
  2 −90/−50    4800   8640  1.5C  8.3x 8.8  4.6x4.9   2005 Nov 12-15     O
  3 −90/−30   18752  21056  H214 10.8x10.8            2006 Apr 29–03May  R
  3 −90/−30    4800   8640  1.5D  8.3x 9.5  4.6x5.3   2006 Jun 19–23     R,O
  4 −30/−15   18752  21056  H214  2.0x 5.1            2006 Oct 14–17     C  
  4 −30/−15    4800   8640  1.5B  8.3x21.1  4.6x11.7  2006 Nov 9–12      O  
  5 −90/−15   18752  21056  H214 10.8x10.8            2007 May 11–16     R  
  5 −90/−15    4800   8640  1.5C  8.3x21.1  4.6x11.7  2007 May 4–10      R,O
  6 −90/  0   18752  21056  H214 10.8x10.8            2007 Oct 26–30     C,R
  7 −15/  0   18752  21056  H75  33.9x33.9            2008 Aug 22–26     R  
  ---------------------------------------------------------------------------
  C = follow-up observations a&t 20GHz,
  O = observations at 5 and 8GHz
  R = Repeat previous bad quality observations
  ---------------------------------------------------------------------------
Note (5): Possible values for flags as follows:
      e = extended source
      h = Galactic HII region,
      p = Galactic planetary nebula
      m = Magellanic clouds source,
      l = no match in low frequency surveys
      b = large and extended
      See the paper for more details of these classifications.


Acknowledgements:
    Tara Murphy, 
(End)                                        Patricia Vannier [CDS]  15-Oct-2009