Charge transfer inefficiency in the Hubble Space Telescope since Servicing Mission 4

Massey, Richard

Abstract

We update a physically motivated model of radiation damage in the Hubble Space Telescope Advanced Camera for Surveys/Wide Field Channel, using data up to mid-2010. We find that charge transfer inefficiency increased dramatically before shuttle Servicing Mission 4, with ∼1.3 charge traps now present per pixel. During detector readout, charge traps spuriously drag electrons behind all astronomical sources, degrading image quality in a way that affects object photometry, astrometry and morphology. Our detector readout model is robust to changes in operating temperature and background level, and can be used to iteratively remove the trailing by pushing electrons back to where they belong. The result is data taken in mid-2010 that recovers the quality of imaging obtained within the first six months of orbital operations.

Citation

Massey, R. (2010). Charge transfer inefficiency in the Hubble Space Telescope since Servicing Mission 4. Monthly Notices of the Royal Astronomical Society: Letters, 409(1), L109-L113. https://doi.org/10.1111/j.1745-3933.2010.00959.x

• Journal Article Type: Article
• Acceptance Date: Sep 20, 2010
• Publication Date: Nov 1, 2010
• Deposit Date: Jan 31, 2012
• Publicly Available Date: Apr 24, 2015
• Journal: Monthly Notices of the Royal Astronomical Society: Letters
• Electronic ISSN: 1745-3933
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 409
• Issue: 1
• Pages: L109-L113
• DOI: https://doi.org/10.1111/j.1745-3933.2010.00959.x
• Keywords: Instrumentation: detectors, Methods: data analysis, Space vehicles: instruments, Techniques: image processing.
• Public URL: https://durham-repository.worktribe.com/output/1510132