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Published September 2007 | Published + Accepted Version
Journal Article Open

The COSMOS Survey: Hubble Space Telescope Advanced Camera for Surveys Observations and Data Processing


We describe the details of the Hubble Space Telescope (HST) Advanced Camera for Surveys (ACS) Wide Field Channel (WFC) observations of the COSMOS field, including the data calibration and processing procedures. We obtained a total of 583 orbits of HST ACS/WFC imaging in the F814W filter, covering a field that is 1.64 deg^2 in area, the largest contiguous field ever imaged with HST. The median exposure depth across the field is 2028 s (one HST orbit), achieving a limiting point-source depth AB(F814W) = 27.2 (5 σ). We also present details of the astrometric image registration and distortion removal and image combination using MultiDrizzle, motivating the choice of our final pixel scale (30 mas pixel^(-1)), based on the requirements for weak-lensing science. The final set of images are publicly available through the archive sites at IPAC and STScI, along with further documentation on how they were produced.

Additional Information

© 2007 The American Astronomical Society. Received 2006 November 30; accepted 2007 March 5. The COSMOS HST Treasury program was supported through NASA grant HST-GO-09822. We wish to thank Tony Roman, Denise Taylor, and David Soderblom for their assistance in the planning and scheduling of the extensive COSMOS observations. We gratefully acknowledge the contributions of the entire COSMOS collaboration, consisting of more than 70 scientists. More information on COSMOS is available at http://cosmos.astro.caltech.edu/. We acknowledge the services provided by the staff at the NASA IPAC/IRSA, as well as the STScI MAST Archive for providing online archive and server capabilities for the COSMOS data sets. The COSMOS Science meeting in 2005 May was supported in part by the NSF through grant OISE-0456439.

Attached Files

Published - KOEapjss07.pdf

Accepted Version - 0703095.pdf


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August 22, 2023
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