New Bad Pixel Mask Reference Files for the Post-NCS Era

Details New Bad Pixel Mask Reference Files for the Post-NCS Era New Bad Pixel Mask Reference Files for the Post-NCS Era

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..71b&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Computer Science

Scientific paper

The last determined bad pixel masks for the three NICMOS cameras were made in September 2002. Those masks were created using data from calibration programs following the installation of the NCS and are therefore based on the relatively limited data set available at the time. Since then, the NICMOS calibration monitoring programs have regularly obtained calibration images of both flat-fields and darks, images used to create the mask reference files. With numerous images taken during a long base-line (2002-2008), this data set allows us to create high signal-to-noise reference files, as well as investigate any temporal dependence of the mask files. Here we describe the creation of new mask files based on this extended data set and compare the new masks with the previous versions. The new masks created contain a higher number of bad pixels compared to the old versions, while the number of pixels thought to be affected by "grot" is lower.

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