Pixel-based CTE Correction Of ACS/WFC: Column Dependency

Details Pixel-based CTE Correction Of ACS/WFC: Column Dependency Pixel-based CTE Correction Of ACS/WFC: Column Dependency

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924102o&link_type=abstract

American Astronomical Society, AAS Meeting #219, #241.02

Astronomy and Astrophysics

Astronomy

Scientific paper

In 2010 Anderson and Bedin (2010, PASP, 122, 1035) created an algorithm to correct the charge transfer efficiency losses in the Wide Field Channel (WFC) of the Advanced Camera for Surveys (ACS). This algorithm has since been put into a new version of the reduction and calibration pipeline, CALACS. One possible improvement to the current code is to apply a column to column dependency of the CTE levels. We have measured the value of the CTE trails in each column using the overscan region of multiple flat field images. The first few pixels of the overscan contain a trail produced by the flux pixels on the edge of the image. As these flux pixels are read out they pass every trap present in the column, making their trail an accurate reflection of the number of traps in that column. For WFC chip 2 we have found 64% of trail values fall within +/- 10% of the average, and 93% fall within +/- 20%. These column specific measurements have been incorporated into the new version of CALACS.

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