Finesky -- removing higher order sky residuals

Details Finesky -- removing higher order sky residuals Finesky -- removing higher order sky residuals

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010nicm.rept....1d&link_type=abstract

Instrument Science Report NICMOS 2010-001, 10 pages

Physics

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

Scientific paper

We report on a new IRAF task called finesky that removes higher order sky residuals in NICMOS images by creating a masked median image of the observed sky. This median sky image is thereafter subtracted from the science images. A residual signal after image processing using the calibration software calnica may be present due to reference files that do not sufficiently match the conditions of the observations. This includes a slight mismatch in the dark current or the flat-field corrections. The task described here can also used to create sky flat-field images.

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