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COSMOS UKIRT Data                                                Version 1.0
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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 VLA
radio telescope, ESO's VLT in Chile, ESA's XMM X-ray satellite, and the
Japanese 8-meter Subaru telescope in Hawaii.

These data represent 18 nights of imaging on UKIRT taken between December
of 2005 and June of 2007 in J band with WF-CAM. These data are psf
homogenized. The filter transmission profile is included in the file
UKIRT_filter_J.txt.

The key characteristics of these data are:

Telescope:			United Kingdom Infrared 3.8m Telescope
Instrument:			WF-CAM
Effective Wavelength:		1.2um
Filter Width:			0.16um
Flux unit:			nJy
Zero Point			31.4
Area:				~4 sq degrees
Resolution:			0.15"/pix
Seeing:				1.74"
PSF Homogenized:		YES

The data products available here include the following at each of
144 tiled positions:
    
    1) an image in units of nJy
    2) a map of the image RMS in units of nJy

A tile diagram is included with the data.

These data were reduced by Henry J. McCracken (hjmcc@iap.fr), 
Herve Aussel (herve.aussel@cea.fr), Peter Capak (capak@astro.caltech.edu)                                 
Dave Thompson (dthompson@as.arizona.edu)                              
Mara Salvato (ms@astro.caltech.edu), and the TERAPIX team (terapix@iap.fr)                                 
Using IRAF with IRTOOLS and IMCAT, and the TERAPIX pipelines.


Information on IRTOOLS can be obtained by e-mail from  
D. Thompson (dthompson@as.arizona.edu)                                            

Information on IMCAT can be found at:

    http://www.ifa.hawaii.edu/~kaiser/imcat/

SWarp v.2.16.4 and Terapix software from 2007-07-16 were used for the
reduction.  Information on Terapix can be found at:

    http://terapix.iap.fr/           

These data were prepared for release by:

Peter Capak (capak@astro.caltech.edu)         
Patrick Shopbell (pls@astro.caltech.edu)

Further information may be obtained from the COSMOS web page:

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

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June  06, 2008