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

2010/09/22 by R. Massey, Richard Massey · 4 citations
Engineering · Physics and Astronomy · #Astrometry #Astronomy #Astrophysics #CCD and CMOS Imaging Sensors #Detector #Galaxy #Gravitational microlensing #Hubble space telescope #Inefficiency #Optics #Photocathodes and Microchannel Plates #Photometry (optics) #Physics #Spitzer Space Telescope #Stars #Stellar, planetary, and galactic studies #Telescope #astro-ph.CO #astro-ph.IM

paper · pdf · doi:10.1111/j.1745-3933.2010.00959.x

published as Mon.Not.Roy.Astron.Soc. 409 (2010) L109-113 · 6 pages, 3 figures. MNRAS in press

arxiv created 2010/09/22 · openalex publication_date 2010/10/11 · arxiv updated 2015/05/20 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05

Abstract

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.

Citations

• Pixel-based correction for Charge Transfer Inefficiency in theHubble Space TelescopeAdvanced Camera for Surveys
• An Empirical Pixel-Based Correction for Imperfect CTE. I.HST’s Advanced Camera for Surveys1

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