Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009wfc..rept....3b&link_type=abstract
Instrument Science Report WFC3 2009-03, 14 pages
Other
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
This report summarizes the behavior of the crosstalk in the Wide Field Camera 3 UVIS-1 flight detector based on thermal-vacuum data taken with the integrated instrument. A nonlinear type of crosstalk seen in previous tests, where a target in one quadrant gives rise to a significant mirror image in each of the other three quadrants, is confirmed as gone (<0.1 e- ), thanks to a hardware fix to the CCD electronics box and a new timing pattern. A small amount of crosstalk remains, in which point sources, extended targets, hot pixels, and cosmic rays generate a low-level mirror image in the quadrant adjoining the target quadrant, on the same chip. This residual crosstalk is linear, negative, and appears at the level of ~10-4 to 10-5 in unbinned, nominal gain (1.5 e-/DN), full-frame 4-amp readouts; the higher level occurs for targets imaged in quadrants A or C and the lower level for targets placed in quadrants B or D. In 3x3 binned 4-amp readouts, the crosstalk from point source targets placed in D is about 20% higher than that seen in unbinned readout. However, the crosstalk in binned frames is negligible for targets placed in quadrants A and B and only a small amount of crosstalk (~5x10-5) occurs due targets placed in C quadrant.
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