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VIII/97 74MHz VLA Low-frequency Sky Survey Redux (VLSSr) (Lane+, 2014)
The following files can be converted to FITS (extension .fit or fit.gz)
table1.dat catalog.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VIII/97
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Beginning of ReadMe :VIII/97 74MHz VLA Low-frequency Sky Survey Redux (VLSSr) (Lane+, 2014)
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The Very Large Array Low-frequency Sky Survey Redux (VLSSr).
Lane W.M., Cotton W.D., van Velzen S., Clarke T.E., Kassim N.E.,
Helmboldt J.F., Lazio T.J.W., Cohen A.S.
<Mon. Not. R. Astron. Soc., 440, 327-338 (2014)>
=2014MNRAS.440..327L
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ADC_Keywords: Radio continuum ; Radio sources ; Surveys
Keywords: techniques: image processing; catalogues; surveys;
radio continuum: general
Abstract:
We present the results of a recent re-reduction of the data from the
Very Large Array (VLA) Low-frequency Sky Survey (VLSS). We used the
VLSS catalogue as a sky model to correct the ionospheric distortions
in the data and create a new set of sky maps and corresponding
catalogue at 73.8MHz. The VLSS Redux (VLSSr) has a resolution of 75",
and an average map rms noise level of sigma 0.1Jy/beam. The clean
bias is 0.66xsigma and the theoretical largest angular size is 36'.
Six previously unimaged fields are included in the VLSSr, which has an
unbroken sky coverage over 9.3sr above an irregular southern boundary.
The final catalogue includes 92964 sources. The VLSSr improves upon
the original VLSS in a number of areas including imaging of large
sources, image sensitivity, and clean bias; however the most critical
improvement is the replacement of an inaccurate primary beam
correction which caused source flux errors which vary as a function of
radius to nearest pointing centre in the VLSS.
Description:
The VLSSr reprocessed all of the data from the original VLSS project.
The observations were made between 2001 and 2007, under VLA observing
programs AP397, AP441, AP452, and AP509. The sky was divided into a
roughly hexagonal grid of 523 pointing centres, at a spacing of
8.6deg. The bandwidth used was 1.56MHz centred at 73.8MHz. Fields in
the range -10<DEC<80deg were observed in the VLA B configuration,
while those at DEC<-10deg and DEC>80deg were observed in the BnA
configuration to compensate for beam elongation at low elevations.
Further details of the observational setup are given in Cohen et al.
(VLSS; 2007, Cat. VIII/79).
The final catalogue contains 92964 entries. Of these, roughly 3 per
cent have no match in the NVSS within 60 arcsec of the fitted
position. However many unmatched sources are actually components of
larger sources which may be fit differently in the two catalogues.
The global rms position error is 3.3 arcsec in RA and 3.5 arcsec in
declination.