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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
at20gcat.dat 142 5890 The AT20G catalogue, version 1.0 (2009-10-15)
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See also:
J/MNRAS/384/775 : Bright Source Sample of AT20G Survey (Massardi+, 2008)
Byte-by-byte Description of file: at20gcat.dat
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Bytes Format Units Label Explanations
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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
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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):
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# Dec. Freq1 Freq2 Array Beam1 Beam2 Dates Rem.
(deg) (MHz) Conf. (arcsec)
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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
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C = follow-up observations at 20GHz,
O = observations at 5 and 8GHz
R = Repeat previous bad quality observations
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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.
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Acknowledgements:
Tara Murphy,
(End) Patricia Vannier [CDS] 15-Oct-2009