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An improved model of charge transfer inefficiency and correction algorithm for the Hubble Space Telescope.

Massey, R. and Schrabback, T. and Cordes, O. and Marggraf, O. and Israel, H. and Miller, L. and Hall, D. and Cropper, M. and Prod'homme, T. and Matias Niemi, S. (2014) 'An improved model of charge transfer inefficiency and correction algorithm for the Hubble Space Telescope.', Monthly notices of the Royal Astronomical Society., 439 (1). pp. 887-907.


Charge-coupled device (CCD) detectors, widely used to obtain digital imaging, can be damaged by high energy radiation. Degraded images appear blurred, because of an effect known as Charge Transfer Inefficiency (CTI), which trails bright objects as the image is read out. It is often possible to correct most of the trailing during post-processing, by moving flux back to where it belongs. We compare several popular algorithms for this: quantifying the effect of their physical assumptions and tradeoffs between speed and accuracy. We combine their best elements to construct a more accurate model of damaged CCDs in the Hubble Space Telescope's Advanced Camera for Surveys/Wide Field Channel, and update it using data up to early 2013. Our algorithm now corrects 98 per cent of CTI trailing in science exposures, a substantial improvement over previous work. Further progress will be fundamentally limited by the presence of read noise. Read noise is added after charge transfer so does not get trailed – but it is incorrectly untrailed during post-processing.

Item Type:Article
Keywords:Instrumentation: detectors, Methods: data analysis, Space vehicles: instruments.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2014 The Authors Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
Record Created:19 Aug 2014 13:35
Last Modified:19 Aug 2014 15:54

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