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COSMOS CFHT Data                                                Version 5.0
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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 four epochs of imaging on CFHT taken between December
of 2005 and June of 2007 in Ks band with WIRCAM. These data are NOT psf
homogenized. However, the observations were constrained to all have seeing
of 0.7-0.9".  The filter transmission profile is included in the file
CFHT_filter_Ks.txt.

If you use these data in your work, please cite it as follows as follows:
McCracken, H.J., Capak, P., Salvato, M., et al. 2010, ApJ, 708, 202

The key characteristics of these data are:

Telescope:			Canada-France-Hawaii 3.6m Telescope
Instrument:			WIRCAM
Effective Wavelength:		2.146um
Filter Width:			0.325um
Flux unit:			nJy
Zero Point			31.4
Area:				~4 sq degrees
Resolution:			0.15"/pix
Seeing:				0.8"
PSF Homogenized:		NO

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)                                 
Richard Cook, Dave Thompson (dthompson@as.arizona.edu)                              
Mara Salvato (ms@astro.caltech.edu), and the TERAPIX team (terapix@iap.fr)                                 
Using IRAF with IRTOOLS and the TERAPIX pipelines.

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

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