Short ACS/WFC Darks and Bias Analysis

Details Short ACS/WFC Darks and Bias Analysis Short ACS/WFC Darks and Bias Analysis

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9715g&link_type=abstract

HST Proposal ID #9715

Physics

Hst Proposal Id #9715

Scientific paper

The current ACS/WFC bias correction is not optimal. Small residuals are due to the random offset between the bias level in the active area and in the overscan region selected as reference. In addition in science and dark frames the bias level of amplifier B shows a bimodal distribution which is however not observed in bias frames. The use of normal bias frames to correct B amp images can result in a bias jump between amp A and B. Since bias frames are readout with a clocking pattern slightly different from the dark and science ones we propose to investigate if short darks {0.5sec} can be used as replacement of bias frames.

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