J/MNRAS/417/2651 AT20G-optical catalogue (Mahony+, 2011)
Optical properties of high-frequency radio sources from the Australia Telescope
20GHz (AT20G) Survey.
Mahony E.K., Sadler E.M., Croom S.M., Ekers R.D., Bannister K.W.,
Chhetri R., Hancock P.J., Johnston H.M., Massardi M., Murphy T.
<Mon. Not. R. Astron. Soc., 417, 2651-2675 (2011)>
=2011MNRAS.417.2651M 2011MNRAS.417.2651M
ADC_Keywords: Galaxy catalogs ; Galaxies, radio ; Galaxies, optical
Keywords: catalogues - galaxies: active - galaxies: evolution -
radio continuum: galaxies
Abstract:
Our current understanding of radio-loud active galactic nuclei (AGN)
comes predominantly from studies at frequencies of 5GHz and below.
With the recent completion of the Australia Telescope 20GHz (AT20G)
survey, we can now gain insight into the high-frequency radio
properties of AGN. This paper presents supplementary information on
the AT20G sources in the form of optical counterparts and redshifts.
Optical counterparts were identified using the SuperCOSMOS data base
and redshifts were found from either the 6dF Galaxy Survey or the
literature. We also report 144 new redshifts. For AT20G sources
outside the Galactic plane, 78.5% have optical identifications
and 30.9% have redshift information. The optical
identification rate also increases with increasing flux density.
Targets which had optical spectra available were examined to obtain a
spectral classification.
Description:
Optical identifications of AT20G sources were made using the
SuperCOSMOS Science Archive, http://surveys.roe.ac.uk/ssa/
(Hambly et al., 2001MNRAS.326.1279H 2001MNRAS.326.1279H).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 181 5890 AT20G-optical catalogue
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See also:
J/MNRAS/402/2403 : Australia Telescope 20GHz Survey Cat., AT20G (Murphy+, 2010)
J/ApJ/718/587 : The Fermi-AT20G catalog (Mahony+, 2010)
J/ApJ/732/45 : VLA fluxes for AT20G radio galaxies (Sajina+, 2011)
J/MNRAS/384/775 : Bright Source Sample of AT20G Survey (Massardi+, 2008)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [AT20G]
6- 19 A14 --- AT20G AT20G name (JHHMMSS+DDMMSS)
21- 22 I2 h RAh Right ascension (J2000)
24- 25 I2 min RAm Right ascension (J2000)
27- 31 F5.2 s RAs Right ascension (J2000)
33 A1 --- DE- Declination sign (J2000)
34- 35 I2 deg DEd Declination (J2000)
37- 38 I2 arcmin DEm Declination (J2000)
40- 43 F4.1 arcsec DEs Declination (J2000)
45- 49 I5 mJy S20 ? Flux density at 20GHz
52- 55 I4 mJy S8.4 ? Flux density at 8.4GHz
58- 61 I4 mJy S4.8 ? Flux density at 4.8GHz
63 A1 --- Q [pg] Quality flag. g: good, p:poor
65- 67 A3 --- n_AT20G [ebdhlmp] AT20G flags (1)
69- 76 F8.1 GHz S1.4 ? NVSS 1.4GHz flux density
78- 85 F8.1 GHz S0.8 ? SUMSS 0.8GHz flux density
87- 88 I2 h RAOh ? Optical right ascension (J2000)
90- 91 I2 min RAOm ? Optical right ascension (J2000)
93- 97 F5.2 s RAOs ? Optical right ascension (J2000)
99 A1 --- DEO- Optical declination sign (J2000)
100-101 I2 deg DEOd ? Optical declination (J2000)
103-104 I2 arcmin DEOm ? Optical declination (J2000)
106-109 F4.1 arcsec DEOs ? Optical declination (J2000)
111-115 F5.1 arcsec off ? Offset from ATG20G source
117-121 F5.2 mag Bmag ? SuperCOSMOS bJ magnitude
123-127 F5.2 mag Rmag ? SuperCOSMOS rF magnitude
129 I1 --- SC [0/4]? SuperCOSMOS class based on the morphology
of the optical source (1=galaxy, 2=star) (2)
131-132 A2 --- f_SC [bouc] Optical flags (3)
135-139 F5.3 --- z ? Redshift
141 A1 --- q_z [12346N] Redshift measurement quality,
values ≥4 are reliable (4)
143-148 A6 --- Type Spectral classification (5)
150-155 F6.2 mag RMAG ? Absolute R magnitude
157-161 F5.2 [W/Hz] logP20 ? Logarithm of the K-corrected 20GHz radio
luminosity
163-181 A19 --- BibCode Reference (6)
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Note (1): AT20G flags as listed in the AT20G catalogue, as follows:
e = AT20G source is extended
d = AT20G source has multiple components (usually a double)
h = Galactic HII region
p = Galactic planetary nebula
m = Magellanic clouds source
l = no match in low frequency surveys
b = Source part of the AT20G 'Big and Bright' sample presented in
Burke-Spolaor et al. (2009MNRAS.395..504B 2009MNRAS.395..504B)
Note (2): Class code:
A value of 1 means the source was classified as a 'galaxy', while a value of
2 denotes a 'stellar' (i.e. point-like) source.
Values greater than 2 indicate that the source was unable to be classified.
Note (3): Optical flags as follows:
b = blended source in the optical
o = Optical source is slightly offset from the radio source, but still
within 3.5arcsec
u = unreliable optical magnitude
c = Optical field is too crowded to make an identification
Note (4): Qualities of 3 or 4 denote a reliable redshift measurement, while
values less then 3 means that the source was observed, but no redshift was
able to be measured. For these sources the redshift is given as -9.99.
A quality 'N' means the redshift was obtained through NED.
Note (5): Spectral classification as follows:
G = Galaxy
Aa = AGN with only absorption features
Ae = AGN with only emission features
Aae = AGN with both absorption and emission lines present
AeB = AGN with broad emission lines
QSO = quasar
SF = Star-forming galaxy
Star = Spectrum of a star
GPair = Galaxy pair
bllac = BL Lac object
bllac? = possible BL Lac object
Note (6): References (when bibcode is not specified):
6dF:6dfname = 6dF observation
Gemini = Gemini-South, 2009-2010 observations
SSO_07 = SSO 2.3-m, 2007 observations
SSO_08 = SSO 2.3-m, 2008 observations
SSO_10 = SSO 2.3-m, 2010 observations
NTT = ESO-NTT 2008 observations
ICRF = ESO-NTT 2010 observations
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Feb-2014