Other
Scientific paper
Feb 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012acs..rept....2g&link_type=abstract
Instrument Science Report ACS 2012-02, 17 pages
Other
Hubble Telescope, Hst, Advanced Camera For Surveys, Acs, Stsci
Scientific paper
Since the installation of the CCD Electronic Box Replacement (CEB-R) during Servicing Mission 4, the ACS Wide Field Channel has exhibited two bias anomalies that have been linked to the CCDs' external preamplifiers and the CEB-R's dual-slope integrators. One anomaly is a temporally stable bias gradient of 5-10 DN across each quadrant; the other anomaly is a local bias shift that depends on the pixel signal and has an e-folding time comparable to the serial transfer of several hundred pixels. Although the bias shift is relatively small (0.02-0.3% of the pixel signal), it can be an impediment to high-contrast science observations and to the removal of other electronic anomalies (e.g., 1/f noise). We have developed a pixel-based algorithm for correcting the signal-dependent bias shift in full-frame WFC images. We describe the calibration and tuning of this algorithm for each WFC quadrant, and we discuss a strategy for implementing this algorithm in the standard CALACS image processing pipeline.
Anderson Jeffrey
Golimowski David
Grogin Norman
Loose Markus
Suchkov Anatoly
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