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COSMOS Subaru 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 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 are imaging taken on the Subaru 8.3m telescope in Bj, Vj, g+,
i+, r+, and z+ bands.  The data under the "matched_psf" directory are 
psf homogenized.  The "best_psf" directory includes only those frames
with exceptional seeing.  

The filter transmission profiles are included in files named 
SUBARU_filter_N.txt, where "N" is the name of the filter.

Please note that the i+ band data have extreamly good seeing and long 
integration times.  As a result some compact objects saturate at 
magnitude 21.5. 

We are uncertain of the filter profile for the Bv band and are 
investigating a possible red leak or shift in the blue cutoff of this 
filter with the Subaru Staff.  As a result of this uncertainty, the 
zero point could be as much as -0.3 mag brighter than the number given 
here.

The key characteristics of these data are:

Telescope:		Subaru 8.3m Telescope
Instrument:		Suprime-Cam
Integration time:	1.2h per pointing 10.4h total (Bj)
                        0.9h per pointing 8.0h total (Vj)
                        1.0h per pointing 9.1h total (g+)
                        0.8h per pointing 7.5h total (i+)
                        0.6h per pointing 5.8h total (r+)
                        1.2h per pointing 10.8h total (z+)
Effective Wavelength:	446.0nm (Bj)
                        548.4nm (Vj)
                        478.0nm (g+)
                        764.1nm (i+)
                        629.5nm (r+)
                        903.7nm (z+)
Filter Width:		 89.7nm (Bj)
                         94.6nm (Vj)
                        126.5nm (g+)
                        149.7nm (i+)
                        138.2nm (r+)
                         85.6nm (z+)
Flux unit:		nJy
Zero Point		31.4
Area:			~4 sq degrees
Resolution:		0.15"/pix
Seeing:			0.95" (Bj)
                        1.33" (Vj)
                        1.58" (g+)
                        0.95" (i+)
                        1.05" (r+)
                        1.15" (z+)

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 Peter Capak (capak@astro.caltech.edu) using
the IMCAT software package. More information on IMCAT can be found at:

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

This data was 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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