Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop11031g&link_type=abstract
HST Proposal ID #11031. Cycle 15
Astronomy and Astrophysics
Astronomy
Scientific paper
Measuring the charge transfer efficiency CTE of an astronomical CCD camera is crucial to determining the CCD's photometric fidelity across the field of view. WFPC2's CTE has degraded steadily over the last 13 years because of continuous exposure to trapped particles in HST's radiation environment. The fraction of photometric signal lost from WFPC2's CTI charge transfer inefficiency is a function of WFPC2's time in orbit, the integrated signal in the image, the location of the image on the CCD, and the background signal. Routine monitoring of WFPC2's CTE over the last 13 years permits an assessment of all but the last condition. The dependence of CTE on background signal must be characterized, however, because a large fraction of WFPC2 images have been obtained under conditions of significant sky background. This program aims to assess the end-of-life CTE of WFPC2's CCDs separately as a function of background signal. Traditional images of an off-center field in NGC 5139 Omega Cen are recorded after preflashing or before postflashing the CCDs with internal lamps to provide average background signals of 0-160 e-, which span the range of sky backgrounds observed in ~99% of long-exposure narrow- and broad-band WFPC2 images.
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