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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 the first four years of imaging on CFHT in u* band.
These data are NOT psf homogenized.  The filter transmission profile
is included in the file CFHT_filter_u.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:		MegaPrime
Effective Wavelength:	379.8nm
Filter Width:		72.0nm
Flux unit:		nJy
Zero Point		31.4
Area:			~4 sq degrees
Resolution:		0.15"/pix
Seeing:			0.9"
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) and the
TERAPIX team (terapix@iap.fr) using the ELIXIR and TERAPIX pipelines.
SWarp v.2.16 and Terapix software from 2006-08-09 were used for the
reduction.

Information on Elixir can be found at:                 
               
    http://www.cfht.hawaii.edu/Instruments/Elixir/                        

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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May 1, 2008