J/MNRAS/371/898 Extragalactic radio sources selected at 20GHz (Sadler+, 2006)
The properties of extragalactic radio sources selected at 20GHz.
Sadler E.M., Ricci R., Ekers R.D., Ekers J.A., Hancock P.J., Jackson C.A.,
Kesteven M.J., Murphy T., Phillips C., Reinfrank R.F., Staveley-Smith L.,
Subrahmanyan R., Walker M.A., Wilson W.E., De Zotti G.
<Mon. Not. R. Astron. Soc., 371, 898-914 (2006)>
=2006MNRAS.371..898S 2006MNRAS.371..898S
ADC_Keywords: Surveys ; Radio sources
Keywords: surveys - galaxies: active - cosmic microwave background -
radio continuum: galaxies - radio continuum: general
Abstract:
We present some first results on the variability, polarization and
general properties of radio sources selected at 20GHz, the highest
frequency at which a sensitive radio survey has been carried out over
a large area of sky. Sources with flux densities above 100mJy in the
Australia Telescope Compact Array 20GHz pilot survey at declination
60° to 70° were observed at up to three epochs during 2002-04,
including near-simultaneous measurements at 5, 8 and 18GHz in 2003. Of
the 173 sources detected, 65 per cent are candidate QSOs or BL Lac
objects, 20 per cent galaxies and 15 per cent faint (bJ>22mag) optical
objects or blank fields.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 146 174 Radio spectra and optical IDs for extragalactic
18GHz sources (|b|>10°), and excluding
objects within of the LMC centre
--------------------------------------------------------------------------------
See also:
VII/6 : Polarization of Extragalactic Radio Sources (Eichendorf+ 1980)
VIII/32 : Extragalactic sources at 5GHz (Jenkins+ 1977)
VIII/78 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2006)
J/A+AS/135/571 : Extragalactic radio sources polarization (Zukowski+, 1999)
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- [SRE2006] AT source name (HHMM-DDMM)
10 A1 --- n_[SRE2006] [#] double [SRE2006] sources (1)
12- 13 I2 h RAh Radio right ascension on 20GHz image (J2000)
15- 16 I2 min RAm Radio right ascension on 20GHz image (J2000)
18- 22 F5.2 s RAs Radio right ascension on 20GHz image (J2000)
24 A1 --- DE- Radio declination sign on 20GHz image (J2000)
25- 26 I2 deg DEd Radio declination on 20GHz image (J2000)
28- 29 I2 arcmin DEm Radio declination on 20GHz image (J2000)
31- 34 F4.1 arcsec DEs Radio declination on 20GHz image (J2000)
36 A1 --- l_bJmag Limit flag on bJmag
37- 41 F5.2 mag bJmag ?=- bJ magnitude from SuperCOSMOS database
43 I1 --- Type ?=- Star/galaxy type of the optical ID,
as classified in SuperCOSMOS (2)
45- 48 I4 mJy S18-02 ?=- 18GHz flux density measured in 2002 (3)
49 A1 --- u_S18-02 []:] Reliability of 2003 flux density (4)
51- 53 I3 mJy e_S18-02 ?=- rms uncertainty on S18-02
55- 58 I4 mJy S18-03 ?=- 18GHz flux density measured in 2003
59 A1 --- u_S18-03 []:] Reliability of 2003 flux density (4)
61- 63 I3 mJy e_S18-03 ?=- rms uncertainty on S18-03
65- 68 I4 mJy S20GHz ?=- 20GHz flux density measured in 2004
70- 72 I3 mJy e_S20GHz ?=- rms uncertainty on S20GHz-04
74- 77 I4 mJy S8.6GHz ?=- 8.6GHz flux density measured in 2003
79- 80 I2 mJy e_S8.6GHz ?=- rms uncertainty on S8.6GHz-03
82- 85 I4 mJy S4.8GHz ?=- 4.8GHz flux density measured in 2003
87- 89 I3 mJy e_S4.8GHz ?=- rms uncertainty on S4.8GHz-03
91- 95 I5 mJy S843MHz ?=- Integrated flux density at 843MHz (5)
97-100 I4 mJy e_S843MHz ?=- rms uncertainty on S843MHz
102 A1 --- l_Pol Limit flag on Pol
103-106 F4.1 % Pol ?=- Fractional linear polarization at 20GHz
measured in 2004
108-110 F3.1 % e_Pol ?=- rms uncertainty on Pol
112 A1 --- l_Var Limit flag on Var
113-116 F4.1 % Var ?=- Debiased variability index at 20GHz
(see section 6.2)
118-132 A15 --- OName Alternative name
134-139 A6 --- Note Notes on individual sources (6)
141-146 F6.4 --- z ? Redshift
--------------------------------------------------------------------------------
Note (1): Sources marked with # are resolved doubles in our 18-20GHz images:
for these objects, the position is that of the radio centroid and
the flux density is the total for both components.
Note (2): Object type as follows:
1 = galaxy
2 = stellar object (QSO candidate)
0 = either a blank field at the source position or a faint (>22mag)
object for which the SuperCOSMOS star/galaxy separation is unreliable
Note (3): For resolved doubles, we list the integrated flux density over
the source
Note (4): Note on flux density as follows:
':' = Flux densities measured at offsets of 60-80" from the field
centre, but should be reliable
']' = Measurements made at offsets of more than 80" from the imaging
field centre at 18-20GHz, and should be regarded as unreliable
because of the large primary-beam correction
Note (5): Integrated flux density at 843MHz, from the Sydney University
Molonglo Sky Survey (SUMSS) catalogue (Mauch et al. 2003, Cat. VIII/78)
Note (6): Notes on individual sources as follows:
C = listed in the online ATCA calibrator catalogue
E = possible EGRET gamma-ray source
(Tornikoski et al., 2002ApJ...579..136T 2002ApJ...579..136T)
I = listed as an IRAS galaxy in the online NED
M = galaxy detected in the near-infrared two-Micron All-Sky Survey
(Cat. II/246)
P = in the Parkes quarter-Jy sample
(Jackson et al., 2002, Cat. J/A+A/386/97)
Q = listed as a QSO in NED
V = VLBI observation with the VSOP satellite
(Hirabayashi et al., 2000, Cat. J/PASJ/52/997)
W = source detected in the first-year Wilkinson Microwave Anisotropy
Probe (WMAP) data (Bennett et al., 2003ApJ...583....1B 2003ApJ...583....1B)
X = listed as an X-ray source in NED
* = polarization observation by Ricci et al.
(2004, Cat. J/A+A/415/549)
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 21-May-2007