J/MNRAS/354/305 ATCA 18GHz pilot survey first results (Ricci+, 2004)
First results from the Australia Telescope Compact Array 18-GHz pilot survey.
Ricci R., Sadler E.M., Ekers R.D., Staveley-smith L., Wilson W.E.,
Kesteven M.J., Subrahmanyan R., Walker M.A., Jackson C.A., De Zotti G.
<Mon. Not. R. Astron. Soc., 354, 305-320 (2004)>
=2004MNRAS.354..305R 2004MNRAS.354..305R
ADC_Keywords: Surveys ; Radio sources
Keywords: surveys - galaxies: active - cosmic microwave background -
radio continuum: galaxies - radio continuum: general
Abstract:
As a pilot study for the first all-sky radio survey at short
wavelengths, we have observed 1216deg2 of the southern sky at 18GHz
(16mm) using a novel wide-band (3.4-GHz bandwidth) analogue correlator
on one baseline of the Australia Telescope Compact Array. We scanned a
region of sky between declination -71° and -59° with an rms
noise level of 15mJy. Follow-up radio imaging of candidate sources
above a 4σ detection limit of 60mJy resulted in 221 confirmed
detections, for which we have measured accurate positions and flux
densities. For extragalactic sources, the survey is roughly 70 per
cent complete at a flux density of 126mJy and 95 per cent complete
above 300mJy. Almost half the detected sources lie within a few
degrees of the Galactic plane, but there are 123 sources with
|b|>5°, which can be assumed to be extragalactic.
Description:
Follow-up synthesis-imaging observations of the S/N≥4 candidate
sources were carried out on 2002 October 8-12 with the ATCA in its
hybrid H168B configuration, which has antennas along the new 214-m
northern spur and the existing eastwest railway track.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 77 226 Measured positions and flux densities for
confirmed 18GHz detections
table3.dat 41 13 Linear polarization detections at 3σ
table5.dat 152 124 Radio spectra and optical IDs for extragalactic
18-GHz sources (|b|>5°, and excluding
objects within 5.5° of the LMC centre).
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See also:
VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-1996)
VIII/70 : Sydney University Molonglo Sky Survey (SUMSS) (Mauch+ 2003)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name (HHMM-DDMM, 18GHz J2000 position)
10- 12 A3 --- m_Name [(NS) ] Multiplicity index on name
13 A1 --- n_Name [L] L: source within the boundaries of the LMC
15- 16 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
21- 25 F5.2 s RAs Right ascension (J2000) (e_RAs∼2.0s)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000) (e_DEs∼1.1")
39- 43 F5.1 deg GLON Galactic longitude
45- 49 F5.1 deg GLAT Galactic latitude
51- 56 F6.1 arcsec DeltaX Offset from the pointing center of the
18GHz follow up image in X
58- 63 F6.1 arcsec DeltaY Offset from the pointing center of the
18GHz follow up image in Y
65- 69 F5.3 Jy Speak 18GHz Peak flux density
71- 75 F5.3 Jy e_Speak rms uncertainty on Speak
77 A1 --- Ext [R-] R: sources which are strongly resolved in
the 18GHz images, i.e. with angular
sizes typically >10")
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name (HHMM-DDMM, 18GHz J2000 position)
11- 16 F6.2 deg GLAT Galactic longitude
18- 21 I4 mJy Speak 18GHz Peak flux density
23- 26 F4.1 % Pol Fractional polarization
29- 41 A13 --- Note Note about the nature of the source
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Name (HHMM-DDMM, 18GHz J2000 position)
10 A1 --- n_Name [#G] Note on Name (1)
12- 13 I2 h RAh Radio (18GHz) Right ascension (J2000)
15- 16 I2 min RAm Radio (18GHz) Right ascension (J2000)
18- 22 F5.2 s RAs Radio (18GHz) Right ascension (J2000)
24 A1 --- DE- Radio (18GHz) Declination sign (J2000)
25- 26 I2 deg DEd Radio (18GHz) Declination (J2000)
28- 29 I2 arcmin DEm Radio (18GHz) Declination (J2000)
31- 34 F4.1 arcsec DEs Radio (18GHz) Declination (J2000)
36- 37 I2 h RAOh ?=* Optical Right ascension (J2000) (2)
39- 40 I2 min RAOm ?=* Optical Right ascension (J2000)
42- 46 F5.2 s RAOs ?=* Optical Right ascension (J2000)
48 A1 --- DEO- Optical Declination sign (J2000)
49- 50 I2 deg DEOd ?=* Optical Declination (J2000)
52- 53 I2 arcmin DEOm ?=* Optical Declination (J2000)
55- 58 F4.1 arcsec DEOs ?=* Optical Declination (J2000)
60 A1 --- l_Bjmag Limit flag on Bjmag
61- 65 F5.2 mag Bjmag Blue (BJ) apparent magnitude of optical ID
67 I1 --- T [1/2]? SuperCOSMOS T stellarity parameter (3)
69- 71 F3.1 arcsec Delta ? Offset between the radio and optical position
73- 76 I4 mJy S18GHz Total (integrated) flux density at 18GHz
78- 80 I3 mJy e_S18GHz rms uncertainty on S18GHz
82- 86 I5 mJy S5GHz ?=* Flux density at 5GHz from PMN catalog,
Cat. VIII/38
88- 90 I3 mJy e_S5GHz ?=* rms uncertainty on S5GHz
92- 98 F7.1 mJy S843MHz ?=* Flux density at 843MHz from SUMSS catalog,
Cat. VIII/70 (4)
100-105 F6.1 mJy e_S843MHz ?=* rms uncertainty on S843MHz
107-111 F5.2 --- Sp+Index ?=* Radio spectral index between 0.843GHz
and 18GHz
113-116 F4.2 --- e_Sp+Index ?=* rms uncertainty on Sp+Index
118-138 A21 --- NEDName NED designation
139-168 A30 --- Notes Notes, from NED
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Note (1): Notes on Name as follows:
# = sources resolved doubles in our 18GHz images, for these objects,
the position is that of the radio centroid and the 18GHz flux
density is the total for both components
G = sources lies at low Galactic latitude (5deg<|b|<10°).
Tentative optical identifications are given for these objects,
but they are not included in the analysis of optical counterparts
in Section 8.3.
Note (2): Position of the closest optical counterpart identified in the
SuperCOSMOS catalogue. Where these columns are blank, there is no
catalogued optical object within 8" of the 18GHz radio position.
Note (3): SuperCOSMOS T parameter defined as follows:
1 = spatially resolved galaxy
2 = stellar object
Note (4): Where no flux density is listed, the source lies in an area of
sky where SUMSS observations had not been completed by mid-2003, and
which was therefore not included in the 2003 July 1 version of the
SUMSS catalogue.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Aug-2005