STScI will be down completely for electrical
work from 2:00 PM Friday, 2 December – 6:00 AM Monday, 5 December, 2016.
Mail will be queued and delivered after the work is completed,
but there may be a delay. DADS and data processing won't be up until
some time Monday morning. Our apologies for the inconvenience.
Faint Images of the Radio Sky at Twenty-cm (FIRST) is a
systematic survey of the North and South Galactic caps begun in 1993,
using the NRAO Very Large Array
(VLA). Typical images are comprised of 1150x1550 1.8" pixels
with 5" resolution.
Source catalogs are also available including peak and integrated
flux densities generated from the high resolution coadded images.
The survey yields very accurate (<1 arcsec rms) radio positions of
faint (>1 mJy/beam) compact sources.
The areas observed were chosen to coincide with
the Sloan Digital Sky Survey.
For more information, see the VLA FIRST Web Site.