Flats: Preliminary WFC Data and Plans for Flight Flats

Details Flats: Preliminary WFC Data and Plans for Flight Flats Flats: Preliminary WFC Data and Plans for Flight Flats

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000acs..rept...10b&link_type=abstract

Instrument Science Report ACS 00-10, 23 pages

Physics

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

Scientific paper

The ACS WFC pixel-to-pixel P-flats with the build-3 detector repeat over a three month time span to a precision of better than 0.1% rms. The shape of the low frequency Lflat field varies with wavelength, where the ratio of the F435W/F814W L-flats differs from unity by - 10% in two patches near opposite corners of the field of view. At ~0.5%, the high frequency pixel-to-pixel structure in the WFC P-flats is about half that of the HRC build-2 and does not increase as much toward shorter wavelengths as the HRC build-2 with the Lesser coating. The amplitude of the fringes for continuum illumination is less than 1%, even in the narrow band ramp filters, while the fringing in monochromatic light is - 10% at 9300 Å. The goals of the laboratory WFC and HRC flat field program are to obtain the set of external flats that fully populates the pipeline database and to archive a baseline of high S/N internal flats for tracking post-launch changes.

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