Physics
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011wfc..rept....9l&link_type=abstract
WFC3 Instrument Science Report 2011-09, 6 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
The IR detector on WFC3 exhibits after images, known as persistence, following exposure to light that exceeds half saturation of individual pixels of the detector. The IR channel of WFC3 has no shutter and therefore light from bright objects reaches the detector between science exposures. For estimating persistence, the time that is important is the time between pixel resets. In intervals between science exposures, all pixels are discharged or reset every 2.91 s. For full-frame exposures, the time between resets is the science exposure time (EXPTIME) plus 5.82 s. Since fullframe exposures are usually much longer than 5.82 s, the difference between the time between resets and the science exposure time is usually not a significant problem for estimating persistence in full-frame exposures. However, the science exposure time for certain sub-array sequences can be considerably shorter than the time between resets, and in these cases, the persistence can be much greater than one expects if the time between resets is not correctly calculated. Here we discusses details of detector timing in order to allow a more accurate estimate of the effective persistence exposure time during an observation.
Bushouse Howard
Long Knox S.
Wheeler Thomas
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