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VIII/84 A final non-redundant catalogue for 7C 151-MHz survey (Hales+ 2007)
The following files can be converted to FITS (extension .fit .fgz or .fiZ)
7c.dat regions.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VIII/84
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drwxr-xr-x 112 cats archive 4096 Nov 7 15:27 [Up]
drwxr-xr-x 2 cats archive 302 Jan 13 2023 [TAR file]
-rw-r--r-- 1 cats archive 470 Dec 19 2022 .message
-r--r--r-- 1 cats archive 9616 Apr 9 2008 ReadMe
-r--r--r-- 1 cats archive 920251 Mar 20 2008 7c.dat.gz [txt] [txt.gz] [fits] [fits.gz] [html]
-rw-r--r-- 1 cats archive 1366 Sep 15 2011 +footg5.gif
-rw-r--r-- 1 cats archive 11246 Apr 10 2008 +footg8.gif
-r--r--r-- 1 cats archive 5088 Apr 9 2008 regions.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe :VIII/84 A final non-redundant catalogue for 7C 151-MHz survey (Hales+ 2007)
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A final non-redundant catalogue for the 7C 151-MHz survey
Hales S.E.G., Riley J.M., Waldram E.M., Warner P.J., Baldwin J.E.
<Mon. Not. R. Astron. Soc. 382, 1639 (2007)>
=2007MNRAS.382.1639H
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ADC_Keywords: Radio sources ; Surveys
Keywords: catalogues - surveys - radio continuum: general
Description:
We present a final unified catalogue for the 7C survey at 151 MHz with
resolution 70x70cosec(dec) arcsec^2^. This has been constructed by
amalgamating the existing catalogues derived from individual fields
imaged at this resolution and eliminating redundancy in regions of
mutual overlap. This is a non-trivial procedure because the flux in
multiple-component sources may be fitted differently on alternative
images, owing, for example, to differences in local noise and beam
distortion. The final catalogue thus produced contains 43683 sources.
Separate final catalogues have been published for the 7C Galactic
Plane survey (7CG, see Cat. J/MNRAS/294/607) and the lower-resolution
survey of the low-declination strip 9h<RA<16h, 20deg<Dec<35deg (Cat.
J/MNRAS/282/779).
The individual catalogues for about 40 of the regions contributing to
the total have already been published, together with full details of
the methodology, in MNRAS or A&AS:
Lacy et al. 1995, MNRAS, 276, 614 (=1995MNRAS.276..614L) (#92 below)
Visser et al. 1995, A&AS, 110, 419 (=1995A&AS..110..419V) (#93 below)
Pooley et al. 1998, MNRAS, 298, 637 (=1998MNRAS.298..637P) (#94-96 below)
Riley et al. 1999, MNRAS, 306, 31 (=1999MNRAS.306...31R) (# 1-33 below)
and these data are also available via the MRAO website at
http://www.mrao.cam.ac.uk/surveys/7C/
Individual catalogues for the remaining 58 regions by Riley et al.
(#34-91 below) were released electronically via the MRAO website in
November 2001. These include a re-analysis of data originally
published in rather a different parametrization by McGilchrist et al.
1990, MNRAS, 246, 110 (=1990MNRAS.246..110M) The regions re-analyzed
are those numbered #41,44,59,60,62 and 63 below and they supersede
McGilchrist's 1990 publication.
The RAxDec coverage, average rms noise, flux density of the faintest
source listed and completeness limit for each of the individual
regions contributing to the final catalogue are given in the table
"regions.dat".
1-sigma errors on the listed source positions may be approximated by:
RA..error(arcsec) = SQRT(1.0**2 + (32/SNR)**2)
Dec.error(arcsec) = Kcosec(dec) x (RA error)
where (approx) K= 1.0 around dec 70, increasing to 1.3 below dec 50,
and 1-sigma errors on the listed flux densities may be approximated by:
Error on S beam-fitted(Jy) = SQRT(0.03**2 + SNR**-2) x S(Jy)
Error on SINT(Jy) = 1.5 x SQRT(0.03**2 + SNR**-2) x SINT(Jy)
where SNR, S and SINT correspond to the columns denoted by those names
in the byte-by-byte description below. For multi-component sources the
SNR for the brightest component is used to estimate the SINT error.
For further details of the surveys and data analysis procedures please
refer to the published papers referenced at the head of this file and
references therein.