IR Channel Subarray Dark Current Behavior

Details IR Channel Subarray Dark Current Behavior IR Channel Subarray Dark Current Behavior

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010wfc..rept...16h&link_type=abstract

Instrument Science Report WFC3 2010-16, 17 pages

Physics

Hubble Space Telescope, Hst, Space Telescope Science Institute, Wide Field Camera 3, Wfc3, Ir, Dark Current, Subarray, Internal, Calibration

Scientific paper

Using data collected during Cycle 17, we have created updated dark current reference files for all IR subarray modes requested by WFC3 users during the cycle. The new files represent a significant increase in the signal-to-noise ratio of these reference files over the old versions. The reference files also show that the dark current signal in the early reads of a MULTIACCUM observation can decrease with time in certain cases. This behavior is dependent upon the timing pattern used to read out the detector, highlighting the importance of read-by-read dark current subtraction. Some of the new reference files also show the effects of "subarray banding", the source of which is currently poorly understood. Future studies should shed light on this effect.

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