Color Dependence of NICMOS Flatfields

Details Color Dependence of NICMOS Flatfields Color Dependence of NICMOS Flatfields

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999nicm.rept....2s&link_type=abstract

Instrument Science Report NICMOS 99-002, 7 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos

Scientific paper

We report two methods for obtaining color dependent flat fields for NICMOS data. The first involves interpolation over wavelength, to obtain monochromatic flatfields. The second multiplies the instrumental response by a user-supplied source spectrum and weights existing narrowband flats by the result. Programs to produce both types of flatfields are described, along with the reference data necessary. We conclude with a discussion of how to make and apply these flatfields to correct data with large color differences within the image.

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