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COSMOS VLA Data                                                 Version 2.0
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The Cosmic Evolution Survey (COSMOS) is an HST Treasury Project to
survey a 2 square degree equatorial field, centered on RA=10:00:28.6
and DEC=+02:12:21.0, using the ACS camera. The project also
incorporates major commitments from other observatories around the
world, including the National Radio Astronomy Observatory's (NRAO)
Very Large Array (VLA) radio telescope.

These VLA data represent the additional 62 hrs of 1.4 GHz (20cm)
observations of the central 7 pointings already imaged by the large
project in A-configuration in February/March 2006. The observations
have been combined with the large project in which the 2 square degree
COSMOS field with the position given above as the center of the field
was surveyed for 275 hours. The observations of the large project were
performed at 1.4 GHz (20 cm), using the VLA in its A- and
C-configuration between September 2004 and September 2005. The final
combined survey has reached a sensitivity of an rms of uJy/beam in the
central 30' at a resolution of 2.5"x2.5".

The key characteristics of these data:

	Configuration:		VLA A-array & C-array
	Dates of observations:	September, 2004 - January, 2005   (A-array)
                                August, 2005    - September, 2005 (C-array)
                                February/March, 2006 (A-array: central 7 pointings)
	Observing time:		250 hours (A-array)
                                 25 hours (C-array)
                                 62 hours (A-array: central 7 pointings)
	Frequency:		1.4 GHz ( = L band, 20cm)
	Bandwidth:		75 MHz (Multi-channel continuum mode)
	Pointings:		23 (hexagonal pattern)
	Area:			2 sq degs (box used for source extraction)
	Resolution:		2.5" x 2.5"
	Sensitivity:		10-40 uJy/beam (inner to outermost regions)


The data products available here include:

	(1) a source catalog, containing 2,901 sources, with
	    their position, fluxes, and sizes
            This is the joint catalog derived from this 2.5" image
            and the revised catalog (v2.0) of the VLA-COSMOS large project
	(2) a flux calibrated, astrometrically correct image,
	    in SIN projection [ "_sin.fits" file in 
	    http://irsa.ipac.caltech.edu/data/COSMOS_INT/images/vla ]


Further information may be obtained from the VLA-COSMOS web page:

	http://www.mpia-hd.mpg.de/COSMOS

or the main COSMOS web page:

	http://cosmos.astro.caltech.edu/

The data reduction, image reconstruction, catalog construction and bandwidth 
correction is similar to the procedures for the large project described in:

"The VLA-COSMOS Survey: II. Source Catalog of the Large Project"
by Schinnerer et al. 2007, ApJS, COSMOS special issue, 172, 46

"The VLA-COSMOS Survey: III. Further Catalog Analysis and the Radio 
Source Counts"
by Bondi et al., 2008, ApJ, 681, 1129

more details will be presented by Schinnerer et al. (in prep.)
"The VLA-COSMOS Survey: IV. Joint Source Catalog of the Large and Deep Project"

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