Noiseless Preflashing of the WFPC2 CCDs

Details Noiseless Preflashing of the WFPC2 CCDs Noiseless Preflashing of the WFPC2 CCDs

Feb 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001wfpc.rept....2s&link_type=abstract

Instrument Science Report 2001-02, 23 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

We present results from analysis of WFPC2 images obtained prior to and following pre-flashing the CCDs (WFPC2 CAL program ID: 8450). A crowded field in the globular cluster Omega Cen (HD116790) was observed, and the WFPC2 calibration lamp was used as the preflash source for the CCDs. A modest enhancement of ~3% in the detected counts was measured for point sources far from the horizontal shift register (at Y=800) for the preflash exposure. For the preflashed exposure, the second image after a preflash showed a decrease in the detected counts. The CCDs essentially returned to a previous sensitivity level.

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