ACS after SM4: Flat Field Stability and Relative Gain Ratios

Details ACS after SM4: Flat Field Stability and Relative Gain Ratios ACS after SM4: Flat Field Stability and Relative Gain Ratios

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546204m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #462.04; Bulletin of the American Astronomical Society, Vol. 42, p.493

Astronomy and Astrophysics

Astronomy

Scientific paper

The flat field stability of the Wide Field Channel (WFC) of the Advanced Camera for Surveys (ACS) is examined using the internal calibration lamps. The pixel-to-pixel flat field structure (P-flat) is studied as a ratio of the post-SM4 to pre-failure values for the standard filter subset: F435W, F625W, F814W and F850LP. Histograms of flat field ratios show that typically, less than 1% of the pixels lie beyond 3 sigma of the expected Gaussian distribution. The individual gain values for the four WFC amplifiers are also determined by matching the flat fields at the boundaries of the four quadrants.

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