Removing Post-SAA Persistence in NICMOS Data

Details Removing Post-SAA Persistence in NICMOS Data Removing Post-SAA Persistence in NICMOS Data

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007nicm.rept....1b&link_type=abstract

Instrument Science Report NICMOS 2007-001, 14 pages

Computer Science

Hubble Space Telescope, Hst, Space Telescope Science Institute, Nicmos, Persistence, Saa, South Atlantic Anomaly, Saaclean

Scientific paper

A general concern with NICMOS images is the issue of "persistence", or residual charge from bright sources and cosmic rays that remains trapped in pixels and is gradually released during subsequent exposures. This is particularly noticeable after HST transits of the South Atlantic Anomaly (SAA), where the cosmic ray rate is so high that their residualflux contributes a significant noise component to many subsequent exposures. We describe the "SAAclean" task which can be run on post-SAA NICMOS images to identifythe amount of charge in each pixel that can be attributed to persistent flux from SAA cosmic rays, and apply a correction based on an SAA persistence model to remove this flux from the data. This task has so far been tested on a variety of NICMOS data, and this represents the most recent update of this task in the PyRAF/STSDAS environment to the HST observer community.

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