Cosmic Ray Persistence in NICMOS Data

Details Cosmic Ray Persistence in NICMOS Data Cosmic Ray Persistence in NICMOS Data

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998nicm.rept....1n&link_type=abstract

Instrument Science Report NICMOS-98-001, 18 pages

Physics

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

Scientific paper

Examination of deep NICMOS exposures of faint galaxy fields reveals that a large fraction are affected by image persistence due to cosmic rays. This results in a significant reduction in data quality and sensitivity. The presence of large numbers of persistent cosmic ray images is found to be strongly correlated with the timing of the observation relative to HST passages through the SAA. Observations taken very soon after emerging from the SAA, and following long SAA passages, are the most severely affected. This correlation was confirmed by the inspection of a large number of darks taken for the NICMOS calibration program. In this report, we discuss the implications for the overall quality of NICMOS data, quantify the tradeoff between data quality and timing of observations relative to SAA passages, and discuss possible strategies to minimize the problem.

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