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VIII/72 CLASS survey of radio sources (Myers+, 2003)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
catalog.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VIII/72
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Beginning of ReadMe :VIII/72 CLASS survey of radio sources (Myers+, 2003)
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The Cosmic Lens All Sky Survey.
I. Source selection and observations.
Myers S.T., Jackson N.J., Browne I.W.A., de Bruyn A.G., Pearson T.J.,
Readhead A.C.S., Wilkinson P.N., Biggs A.D., Blandford R.D., Fassnacht C.D.,
Koopmans L.V.E., Marlow D.R., McKean J.P., Norbury M.A., Phillips P.M.,
Rusin D., Shepherd M.C., Sykes C.M.
<Mon. Not. R. Astron. Soc. 341, 1 (2003)>
=2003MNRAS.341....1M
II. Gravitational lens candidate selection and follow-up.
<Mon. Not. R. Astron. Soc. 341, 13 (2003)>
=2003MNRAS.341...13B
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ADC_Keywords: Radio sources
Keywords: cosmology ; gravitational lensing
Abstract:
The Cosmic Lens All-Sky Survey (CLASS) is an international
collaborative program aimed at obtaining high-resolution radio images
of over 10000 flat-spectrum radio sources in order to create the
largest and best studied statistical sample of radio-loud
gravitationally lensed systems. CLASS is aimed at identifying lenses
where multiple images are formed from compact flat-spectrum radio
sources, which should be easily identifiable in the radio maps (Browne
et al., 2003MNRAS.341...13B). In four observing ``seasons'' from
1994-1999, CLASS has observed 13832 radio sources. When combined with
the JVAS survey, the CLASS sample contains over 16,000 images. Using
the GB6 and NVSS surveys, a complete statistical subset of 11685
sources has been constructed. These were selected from the NVSS 20-cm
(Condon et al., 1998, Cat. VIII/65) and GB6 6-cm (Gregory et al.,
1996, Cat. VIII/40) catalogues by the selection criteria:
declination >0deg, |b|<10deg, S(6cm)>=30mJy, and spectral index
between 6 and 20cm flatter than -0.5 (S proportional to
frequency^+alpha^). The remaining sources were selected using earlier
versions of these catalogues or with slightly relaxed versions of
these criteria.
Introduction:
The data in this table were assembled from pointings at 16503 radio
sources in the JVAS and CLASS surveys between 1990 and 1999 using the
VLA in A-configuration at 8.4GHz. The resolution is approximately
220 milliarcsec. The data were mapped using an automatic DIFMAP script
(Shepherd et al., 1997, ASP Conference Series, 125, 77) which located
the brightest radio source within a 2' by 2' box around the pointing
position, and searched for all subsidiary components within a 70"x70"
box around the brightest source. Sources were regarded as not detected
if no component of 5mJy or more was visible in the initial search box.
Except in cases of bad data or complicated sources, the positions of
primary sources of 30mJy or above are accurate to about 40mas. More
details of the process are given in the paper (2003MNRAS.341....1M)