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COSMOS Chandra Merged Image Data   (X-ray band)                 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, NASA's Chandra X-ray Observatory and
the Japanese 8-meter Subaru telescope in Hawaii.

These data are part of the first public release of the COSMOS observations from
the ACIS instrument on Chandra. Included in this release dataset are merged
images and effective exposure maps representing the X-ray energy bands 0.5 - 2
keV (soft), 2 keV - 7 keV (hard), and 0.5 - 7 keV (full).  Each image and
exposure map covers the entire 0.9 sq deg field of the Chandra-COSMOS survey.

The key characteristics of these data:

	Instrument:		Chandra ACIS-I
	Dates of observations:	(Nov 2006 - Jun 2007)
	Observing time:		1.8 Msec
	Energy band:		0.5 - 7 keV
	Area:			0.9 sq deg
	Resolution:		1.0"/pixel

These data were generated by  Nico Cappelluti.

The data products include:

(1) CC<Energy>_img.fits.gz    - Merged X-ray image files (counts)            
(2) CC<Energy>_expmap.fits.gz - Corresponding effective exposure maps (sec)

Here <Energy> is 0520, 2070, or 0570 corresponding to the soft, hard, and
full energy bands respectively.

Further information may be obtained from the main COSMOS web page:

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

and the Chandra-COSMOS web page:

	http://chandracosmos.cfa.harvard.edu/

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The COSMOS Team, Patrick Shopbell (Archive Lead), and Tom Aldcroft
pls@astro.caltech.edu, taldcroft@cfa.harvard.edu

July 22, 2008