Calibration of HST wide field camera for quantitative analysis of faint galaxy images
Ratnatunga, K. U., Griffiths, R. E. Casertano, S., Neuschaefer, L. W., & Wyckoff, E. W.
Johns Hopkins University, Baltimore, MD 21218, USA
Calibrating Hubble Space Telescope
Space Telescope Science Institute, Baltimore, MD, USA
1993 November 15-17
J. Chris Blades and Samantha J. Osmer
Space Telescope Science Institute, Baltimore, Maryland, 1993.
QB500.XXX .CXX 1993.
Accurate V and I flat fields for the Hubble Space Telescope Wide
Field Camera have been obtained using the sky background in images taken
for the Medium-Deep Survey, a Key Project. These `super-sky' flat
fields have pixel-to-pixel rms variations of about 2.2% in V and
2.4% in I and are uniform to better than 3% peak-to-peak over
almost all the exposed area. Super-sky flat fields can increase the
photometric accuracy of WFC images by about a factor of 3 with respect
to the Earth flats and, because of the low level of illumination, are
better suited for the quantitative study of faint images in deep
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