Computer Science – Performance
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001wfc..rept...13l&link_type=abstract
Instrument Science Report 2001-13, 16 pages
Computer Science
Performance
Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3
Scientific paper
With performance optimization as the driver, we investigate how the WFC3 IR detector quantum efficiency wavelength cutoff impacts the performance of the instrument, and how the design of the H filter can be used to maximize sensitivity. This study demonstrates an important trade: to balance the desire for a cutoff at longer wavelengths (and hence to use a Nicmos-like H filter) with the need to minimize the effects of zodi, thermal and dark background. We use a modified version of the WFC3 Exposure Time Calculator to predict the performance of the instrument using variousQE cutoffs, dark signals, and H filter designs. The intention of the study is to provide the basis for scientific discussion on the design of the H filter. We conclude that: 1) the H band filter cutoff in the red should fall within the detector sensitivity curve in the red, 2) the sky+thermal signal dominate the background at wavelengths less than 1.76 microns and the dark dominates at longer wavelengths - implying that the cutoff should be somewhere below 1.76 microns, 3) the impact of the cutoff wavelength in the regime between 1.70 and 1.73 is small suggesting that, for faint and extended targets, the cutoff anywhere in this range is acceptable.
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