Pixel-based CTE Correction of ACS/WFC: CTE Time And Temperature Dependence

Details Pixel-based CTE Correction of ACS/WFC: CTE Time And Temperature Dependence Pixel-based CTE Correction of ACS/WFC: CTE Time And Temperature Dependence

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924103u&link_type=abstract

American Astronomical Society, AAS Meeting #219, #241.03

Astronomy and Astrophysics

Astronomy

Scientific paper

We perform a comprehensive and detailed study of the evolution of the effect of charge transfer efficiency (CTE) of the Wide-Field Channel of the Advanced Camera for Surveys (ACS). The study is based on the profiles of warm pixels in all the dark frames ever produced by ACS between 2002 and 2011. We apply the pixel-based empirical approach by Anderson & Bedin (2010, PASP, 122, 1035) which restores flux, position and shape of sources in the original images. We demonstrate that this image-restoration process properly accounts for the time and temperature dependence for CTE in ACS, and that it works for all epochs: the original setting when the camera was operated at -77 ºC and also on the post-SM4 data obtained with the current temperature set at -81 ºC. We also demonstrate that the code has been successfully integrated in the ACS calibration and reduction pipeline CALACS.

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