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STScI - Space Telescope Science Institute
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United States
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Abstract Reference: 31410
Identifier: P5.1
Presentation: Poster presentation
Key Theme: 5 Data Models in Astrophysics

Mitigating radiation damage effects in the HST/WFC3 CCD detectors

Authors:
Sylvia Baggett, Jay Anderson, Megan Sosey

CCD detectors in low-Earth orbit are known to suffer from accumulating radiation damage and the Hubble Space Telescope Wide Field Camera 3 (HST/WFC3) is no exception. In WFC3/UVIS, the damage produces a growing hot-pixel population along with charge traps that cause a progressive loss in charge-transfer efficiency (CTE) over time. The CTE decline results in both a reduction of the detected source fluxes as well as a systematic shift in the measured source centroids, and the impact can be substantial, particularly for faint sources in low-background images.
In this report, we summarize the state of the radiation-damage effects in WFC3/UVIS and discuss the available mitigation options, with a focus on the algorithm and software that comprise the pixel-based CTE correction available in the automated WFC3 calibration pipeline in 2016.