Characteristics of NICMOS Detector Dark Observations

Details Characteristics of NICMOS Detector Dark Observations Characteristics of NICMOS Detector Dark Observations

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997nicm.rept...26s&link_type=abstract

Instrument Science Report NICMOS-97-026, 15 pages

Computer Science

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

Scientific paper

This ISR describes the characteristics of the ‘dark current’ for the NICMOS flight detectors, namely the instrumental signal present in exposures made in the absence of any external illumination. We show how this comprises three distinct components - the shading, amplifier glow, and the true dark current. Each of these three components is described, and examples from the on-orbit observations are presented. We then describe a recipe for generating ‘synthetic’ dark current calibration reference files, which could in principle be used to generate darks for any arbitrary sequence of MULTIACCUM reads, and present results of a comparison of such a synthetic dark with observed data. Finally we describe the deficiencies that are still present in our understanding of the properties of NICMOS detector darks.

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