HRC and WFC Flat Fields: Standard Filters, Polarizers, and Coronograph

Details HRC and WFC Flat Fields: Standard Filters, Polarizers, and Coronograph HRC and WFC Flat Fields: Standard Filters, Polarizers, and Coronograph

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001acs..rept...11b&link_type=abstract

Instrument Science Report ACS 2001-11, 24 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs, Stsci

Scientific paper

Laboratory flats with simulated sky illumination of the CCD cameras have been obtained for supported and many unsupported ACS modes. The ACS HRC flight detector shows a typical sensitivity variation from center to edge of ~10%, while the large format WFC minimum/maximum sensitivity variation is ~15%. The CEI specification of +-10% uniformity is met for WFC and HRC. The intrinsic rms variation of sensitivity in the pixel-topixel P-flat is 0.5-0.9%, so that observed flats with ~100,000 electrons/px and an rms of ~0.3% are required to improve the intrinsic S/N that is possible without a P-flat field reference file These high S/N flats are the P-flats combined with the low frequency L-flat sensitivity variation over the field. The 142 measured LP-flats include 13 and 17 single filter flats for WFC and HRC, respectively, 78 polarizer mode flats, and 34 flats of all types for the HRC coronographic mode. In addition, estimates are made for 15 supported modes that were not measured directly. All 157 flats are now available as reference files for the pipeline processing of ACS observations from Cycle 11.

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