WFPC2 Flatfields with Reduced Noise

Details WFPC2 Flatfields with Reduced Noise WFPC2 Flatfields with Reduced Noise

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001wfpc.rept....7k&link_type=abstract

Instrument Science Report 2001-07, 17 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 2, Wfc2

Scientific paper

We examine the noise contributed by the WFPC2 flatfields during normal calibration, and provide new low-noise flats for 41 filters. Highly exposed science images (>20,000 electrons per pixel) will show significant noise reduction if these new flats are used; this is especially true for images on the PC1 chip. For some ultraviolet filters a significant improvement occurs even for much lower exposure levels. Potential photometric issues are also discussed. The new flats are available in the HST data archive as brated science data (i.e. data which have already calibrated with the normal flatfields) to obtain the noise reduction. These corrections may be incorporated in the normal pipeline flatfields at some future date for selected filters.

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