J/AJ/136/1889 20cm observations of deep Swire Field (Owen+, 2008)
The Deep Swire Field. I. 20cm continuum radio observations: a crowded sky.
Owen F.N., Morrison G.E.
<Astron. J. 136, 1889-1900 (2008)>
=2008AJ....136.1889O 2008AJ....136.1889O (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Surveys
Keywords: cosmology: observations - galaxies: evolution - galaxies: starburst
infrared: galaxies
Abstract:
We present results from deep radio observations taken with the Very
Large Array at a center frequency of 1400MHz covering a region of the
Spitzer Wide-area InfraRed Extragalactic Survey of the Spitzer Legacy
survey, centered at 10:46:00, +59:01:00 (J2000). The reduction and
cataloging of radio sources are described. An electronic catalog of
the sources detected above 5σ is also presented. The survey
presented is the deepest so far in terms of the radio source density
on the sky. Perhaps surprisingly, the sources down to the bottom of
the catalog appear to have median angular sizes still greater than
1-arcsec, like their cousins 10-100 times stronger. The shape of the
differential logN-logS counts also seems to require a correction for
the finite sizes of the sources to be self-consistent. If the
logN-logS normalization remains constant at the lowest flux densities,
there are about six sources per square arcminute at 15uJy at 20cm.
Given the finite-source size this implies that we may reach the
natural confusion limit near 1uJy.
Description:
Observations were made with the VLA in A, B, C, and D configurations
for a total of almost 140hr on-source between 2001 December and 2004
January.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 85 2056 Radio source catalog
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See also:
J/AJ/137/4846 : The deep SWIRE field II. (Owen+, 2009)
J/ApJS/182/625 : The deep SWIRE field III. (Owen+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- [OM2008] Catalog Source Number
7- 8 I2 h RAh Hour of Right Ascension (J2000)
10- 11 I2 min RAm Minutes of Right Ascension (J2000)
13- 17 F5.2 s RAs Seconds of Right Ascension (J2000)
20- 23 F4.2 s e_RAs Error in RAs
25 A1 --- DE- Sign of Declination (J2000)
26- 27 I2 deg DEd Degrees of Declination (J2000)
29- 30 I2 arcmin DEm Arcminute of Declination (J2000)
32- 35 F4.1 arcsec DEs Arcsecond of Declination (J2000)
38- 40 F3.1 arcsec e_DEs Error in DEs
43- 48 F6.1 uJy Speak Observed peak brightness at 1400MHz (1)
50- 56 F7.1 uJy Stot Total Flux Density at 1400 MHz
58- 63 F6.1 uJy e_Stot Error in Stot
65- 70 F6.1 --- S/N Peak Signal/Noise ratio
72 A1 --- l_bmaj [< ] Limit flag for size
73- 77 F5.1 arcsec bmaj Fitted Gaussian major axis FWHM (2)
79- 81 F3.1 arcsec bmin ? Fitted Gaussian minor axis FWHM
83- 85 I3 deg PA ? Fitted position angle
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Note (1): In units of microJanskys/beam and uncorrected for primary beam
or bandwidth smearing.
Note (2): Or maximum size for very resolved sources.
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History:
From electronic version of the journal
References:
Owen F.N.+, Paper II. 2009AJ....137.4846O 2009AJ....137.4846O, Cat. J/AJ/137/4846
Owen F.N.+, Paper III. 2009ApJS..182..625O 2009ApJS..182..625O, Cat. J/AJ/182/625
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Jan-2010