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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 original combined observations are in the
"original_psf" directory.]  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.

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October 2008 WARNING:

The COSOMOS Subaru FITS images in the directory subaru/matched_psf/ip/*fits
contain FITS-compliant problems.  We are aware of these issues and are
working on fixing them for the next release.

Most of the COSOMOS Subaru flats FITS file images subaru/flats/*/*fits
do not contain a complete World Coordinate System (WCS) in the header
and therefore are not available in the positional search results nor
Cutout image results.  We are also working on this issue for the next
release.

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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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