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

Massey, Richard (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.


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.

Item Type:Article
Keywords:Instrumentation: detectors, Methods: data analysis, Space vehicles: instruments, Techniques: image processing.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society: letters. ©: 2010 The Authors. Journal compilation © 2010 RAS Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:20 September 2010
Date deposited:24 April 2015
Date of first online publication:November 2010
Date first made open access:No date available

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