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Proceedings Paper

Persistence and count-rate nonlinearity in the HST WFC3 IR detector
Author(s): Susana Deustua; Knox S. Long; Peter McCullough; Adam G. Riess; John MacKenty; Randy Kimble; Sylvia M. Baggett; Bryan Hilbert; Robert J. Hill; Cheryl Pavlovsky; Larry D. Petro
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Paper Abstract

We now know that the flux of a source measured with HgCdTe arrays is not a simple, linear function, but depends on the count-rate as well as the total number of counts. In addition to the count-rate non-linearity (and probably related to the same physical mechanism), HgCdTe detectors are also susceptible to image persistence. Most of the persistence image fades in a few minutes, but there is a longer-term component that can result in faint afterimages in the next orbit, approximately 45 minutes later. For sources saturated at ~100 times full-well, the afterimages can persist for hours afterwards. This report describes results from ground and on-orbit tests to characterize the persistence and the count-rate non-linearity in the WFC3 IR detector during its first year of operation.

Paper Details

Date Published: 10 August 2010
PDF: 8 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77313C (10 August 2010); doi: 10.1117/12.857582
Show Author Affiliations
Susana Deustua, Space Telescope Science Institute (United States)
Knox S. Long, Space Telescope Science Institute (United States)
Peter McCullough, Space Telescope Science Institute (United States)
Adam G. Riess, Space Telescope Science Institute (United States)
The Johns Hopkins Univ. (United States)
John MacKenty, Space Telescope Science Institute (United States)
Randy Kimble, NASA Goddard Space Flight Ctr. (United States)
Sylvia M. Baggett, Space Telescope Science Institute (United States)
Bryan Hilbert, Space Telescope Science Institute (United States)
Robert J. Hill, NASA Goddard Space Flight Ctr. (United States)
Conceptual Analytics, LLC (United States)
Cheryl Pavlovsky, Space Telescope Science Institute (United States)
Larry D. Petro, Space Telescope Science Institute (United States)


Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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