HRC and WFC Flat Fields: Dispersors, Anomalies, and Photometric Stability

Details HRC and WFC Flat Fields: Dispersors, Anomalies, and Photometric Stability HRC and WFC Flat Fields: Dispersors, Anomalies, and Photometric Stability

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002acs..rept....4b&link_type=abstract

Instrument Science Report ACS 2002-004, 24 pages

Physics

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

Scientific paper

The ACS has a prism PR200L that covers the 2000-4000A region on HRC and a grism G800L that covers 5500-11000A on both HRC and WFC. The flat field for the UV prism is largely wavelength independent, while the strong wavelength dependence of the G800L Lflat structure requires a flat field correction scheme based on a data cube of monochromatic flats. Our suggested correction scheme reduces the L-flat residual structure below 1% rms over most of the wavelength range. Various anomalies in the UV polarizing flats and the F892N+POLV flats are described and solutions proposed. The repeatability of the LP-flats is quantified. Solutions are proposed for single step random variation in the filter wheel positions.

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