WFC3 Near-IR Channel: PSF and PlateScale Study

Details WFC3 Near-IR Channel: PSF and PlateScale Study WFC3 Near-IR Channel: PSF and PlateScale Study

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999wfc..rept....1s&link_type=abstract

Instrument Science Report WFC3 1999-01, 11 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3

Scientific paper

This report focuses on the PSF properties and plate scale optimization for the Near-IRchannel of WF C3. We discuss how various effects lead to the final observed PSF in NICMOS Camera 2 and suggest apodization of the cold stop as a possible way to improve contrast for the Near-IR channel of WFC3. We derive a model for the pixel response of the NICMOS arrays and use this model to produce simulated images which are then employed to evaluate the WFC3 photometric accuracy as a function of pixel scale. We find that images with a pixel size of 0.15'' are shallower than those with a pixel size of 0.10'' by about 0.3 mag. This can be compensated by longer exposure times still maintaing a 45 percent discovery efficiency advantage for the larger pixel size. The difference between thetwo pixel sizes in the presence of crowding is much smaller than the deviation of both fromthe ideal case of infinite resolution.

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