Computer Science
Scientific paper
Jan 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008wfc..rept....1b&link_type=abstract
Instrument Science Report WFC3 2008-01, 38 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Thermal Vacuum 2, Tv2
Scientific paper
This report summarizes the behavior of the WFC3 calsystem, based upon data acquired during thermal-vacuum level tests performed in 2007 with the UVIS-2 (flight spare) and IR-1 (FPA129, pre-flight) detectors. The illumination patterns and features observed in the tungsten and deuterium flatfields are described and their characteristics evaluated in light of the calsystem requirements. Although two of the four tungsten bulbs burned out and a third was degrading by the end of TV2, the one good tungsten bulb and the UV deuterium lamp delivered, with a very small number of exceptions, illumination satisfying the flux requirement (>16.7 /s/pix) and the uniformity specification (< factor of two over the full field of view). The long-term stability needs (better than 5%) are met in many instances but not all. In addition, there are low-level (few percent) features in the flatfields which are seen to vary over time. Also noted was a tendency for UVIS and IR tungsten flatfields taken with MEB2 (instrument side 2) to be fainter by a few percent than those taken with MEB1. Finally, the analysis of the IR flatfields revealed that the early reads in a subarray ramp are distinctly non-linear when compared to later reads in the ramp; the OPUS calibration pipeline calwf3 and/or WFC3 FSW will need to be adjusted to handle these cases.
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