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[*] Residual Bias Removal in HST NICMOS Images
Bushouse H., Dickinson M., van der Marel R.P.
in `Astronomical Data Analysis Software and Systems IX', Manset N., Veillet C., Crabtree D., eds., ASP Conference Series, Vol. 216, p. 531-534, 2000
© 2000. Astronomical Society of the Pacific. All Rights Reserved.

Software tools have been developed to allow observers to examine and correct NICMOS images for the presence of residual bias signal. The NICMOS detector bias can drift between and during exposures, due to small changes in temperature. Subtraction of a standard calibration frame can therefore leave residual bias signal, which then results in the presence of a flatfield imprint in processed images. Correction routines have been developed that determine the residual bias signal by iteratively solving for the signal level that minimizes the flatfield imprint.

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Last modified March 30, 2001.
Roeland van der Marel, marel@stsci.edu.
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