WF/PC INSTRUMENT REPORT- WF/PC 91-01:
Post-Flood PC Quantum Efficiency
-Keith Horne, Christine E. Ritchie
February 15, 1991
Excerpted from the summary:
PC frames of [Omega] Centauri taken on January 2, 1991 through 10 filters have been used to determine the post-flood quantum efficiency of the PC. The [Omega] Cen frames were taken shortly after the UV flood and subsequent safeing event. Observed count rates were obtained by aperture photometry with 60 and 10 pixel radii. Ground-based photometry was used to estimate the spectra of the [Omega] Cen targets. The spectrum for each target was then used with WF/PC-1 passbands from the CDBS database (which are those presented in the 1990 WF/PC-1 Handbook) to calculate the predicted total count rates for each WF/PC-1 filter.
There is little agreement among the count rate in the UV filters, varying from 2 times lower to 2 times higher than predicted. These results are not currently understood. The count rates for F439W, F547M, F555W, F702W, and F718M are about right, and about 2 times lower than predicted for F785LP and F889N.
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