Photometric Anomalies in WFPC2

Details Photometric Anomalies in WFPC2 Photometric Anomalies in WFPC2

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.3602w&link_type=abstract

American Astronomical Society, 193rd AAS Meeting, #36.02; Bulletin of the American Astronomical Society, Vol. 30, p.1298

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We summarize the current knowledge of two photometric anomalies which primarily affect faint stellar targets observed with the Wide-Field / Planetary Camera 2 (WFPC2) onboard HST. The CTE (Charge Transfer Efficiency) problem causes targets to appear too faint, and primarily depends on target position on the CCD, the background level in the image, and the target counts. For typical cases (i.e. long exposures in broad filters) the effect is much smaller than the combined photon and read noise. However, in the worst case scenario of a narrow band filter and a faint (10 DN) target, the effect can be as large as 40%. There is evidence that the CTE effect is slowly increasing with long-term radiation exposure of the CCDs. A second effect, called the long vs. short exposure effect for historical reasons, is primarily a function of target counts. The effect ranges from 2% for star images containing > 300DN, to as much as 40% for images containing only 10 DN. Algorithms are available to correct both effects to <2% accuracy for bright targets, and 5% accuracy for faint ones.

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