Physics
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005wfc..rept....9b&link_type=abstract
Instrument Science Report WFC3 2005-09, 12 pages
Physics
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
This report summarizes the behavior of the calsystem in the UVIS and IR channels, based upon the recent thermal vacuum data as well as earlier ambient data. The UVIS tungsten flatfields technically meet the uniformity specification but show gradients of up to 1.5x across the field of view. There are prominent glints in two quadrants as well, ranging from 1.1x to 1.6x brighter than the surrounding area. The UVIS tungsten count rates in the subset of filters sampled during ambient testing were found to meet the flux requirement. The UVIS deuterium (D2) calsystem flatfields were found to meet the flux requirement as well (when measured in the midrange level of the flats) but they fail the uniformity requirement, showing gradients of 5 to 10x across the field of view. The IR calsystem flatfields fail to meet the uniformity requirement: they are highly vignetted, with large (>25x) gradients from center to corner across the field of view. Flux levels in the IR calsystem flatfields (taken in all IR filters except the two grisms), measured in the central bright region of the illuminated area, meet the flux requirement.
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