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VIII/92 The FIRST Survey Catalog, Version 2014Dec17 (Becker+ 2014)
The following files can be converted to FITS (extension .fit or fit.gz)
first14.dat, first13.dat
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=VIII/92
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The last of FIRST: the final catalog and source identifications.
Helfand D.J., White R.L., Becker R.H.
<Astrophys. J. 801, 26 (2015)>
=2015ApJ...801...26H
=2015yCat.8092....0H
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ADC_Keywords: Radio sources ; Surveys
Description:
The Faint Images of the Radio Sky at Twenty centimeters (FIRST) began
in 1993. It uses the VLA (Very Large Array, a facility of the National
Radio Observatory (NRAO)) at a frequency of 1.4GHz, and it is slated
to 10,000 deg^2^ of the North and South Galactic Caps, to a
sensitivity of about 1mJy with an angular resolution of about 5''. The
images produced by an automated mapping pipeline have pixels of
1.8'', a typical rms of 0.15mJy, and a resolution of 5''; the images
are available on the Internet (see the FIRST home page at
http://sundog.stsci.edu/ for details). The source catalogue is derived
from the images.
This catalog from the 1993 through 2011 observations contains 946,432
sources from the north and south Galactic caps. It covers a total of
10,575 square degrees of the sky (8444 square degrees in the north and
2131 square degrees in the south).
In this version of the catalog, images taken in the the new EVLA
configuration have been re-reduced using shallower CLEAN thresholds in
order to reduce the "CLEAN bias" in those images. Also, the EVLA
images are not co-added with older VLA images to avoid problems
resulting from the different frequencies and noise properties of the
configurations. That leads to small gaps in the sky coverage at
boundaries between the EVLA and VLA regions. As a result, the area
covered by this release of the catalog is about 60 square degrees
smaller than the earlier release of the catalog (13Jun05, also
available here as the "first13.dat" file), and the total number of
sources is reduced by nearly 25,000. The previous version of the
catalog does have sources in the overlap regions, but their flux
densities are considered unreliable due to calibration errors. The
flux densities should be more accurate in this catalog, biases are
smaller, and the incidence of spurious sources is also reduced.
Over most of the survey area, the detection limit is 1 mJy. A region
along the equatorial strip (RA=21.3 to 3.3hr, Dec=-1 to 1deg) has a
deeper detection threshold because two epochs of observation were
combined. The typical detection threshold in this region is 0.75mJy.
There are approximately 4,500 sources below the 1mJy threshold used
for most previous versions of the catalog.
The previous versions
http://sundog.stsci.edu/first/catalogs/