Time Dependence of ACS WFC CTE Corrections for Photometry and Future Predictions

Details Time Dependence of ACS WFC CTE Corrections for Photometry and Future Predictions Time Dependence of ACS WFC CTE Corrections for Photometry and Future Predictions

May 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004acs..rept...12r&link_type=abstract

Instrument Science Report ACS 2004-006, 13 pages

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Applications

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Wfc

Scientific paper

We present measurements of photometric losses due to imperfect parallel and serial CTE on ACS WFC on 3 distinct dates: March 2003, August 2003, and February 2004. Improvements in our method of measuring the photometric losses are discussed. At all dates we see strong evidence for photometric losses in the parallel direction whose values grow with decreasing stellar flux and background. We see evidence for a modest increase in these photometric losses with time. We provide a global fitting formula to correct for CTE losses for all flux levels, sky values, and times. We continue to see no evidence of loss along the serial direction (as expected). The photometric losses from imperfect parallel CTE decrease with increasing aperture size (likely) due to the ability of large apertures to recapture a fraction of the trapped and emitted charge. We extrapolate our time-dependent correction formula to the end of the decade and predict that for the vast majority of science applications the use of CTE correction formulae will retain the precision of flux measurements to better than a few percent.

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