Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 401, Issue 1, Pages 371-384Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2009.15638.x
Keywords
instrumentation: detectors; methods: data analysis; space vehicles: instruments
Categories
Funding
- NASA [HST-AR-10964, HST-GO-09822, NAS 5-26555]
- STFC [PP/E006450/1, MIRG-CT-208994]
- Chamberlain Fellowship at LBNL
- Berkeley Center for Cosmological Physics
- Science and Technology Facilities Council [PP/E006450/1] Funding Source: researchfish
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Charge Transfer Inefficiency (CTI) due to radiation damage above the Earth's atmosphere creates spurious trailing in Hubble Space Telescope (HST) images. Radiation damage also creates unrelated warm pixels - but these happen to be perfect for measuring CTI. We model CTI in the Advanced Camera for Surveys (ACS)/Wide Field Channel and construct a physically motivated correction scheme. This operates on raw data, rather than secondary science products, by returning individual electrons to pixels from which they were unintentionally dragged during readout. We apply our correction to images from the HST Cosmic Evolution Survey (COSMOS), successfully reducing the CTI trails by a factor of similar to 30 everywhere in the CCD and at all flux levels. We quantify changes in galaxy photometry, astrometry and shape. The remarkable 97 per cent level of correction is more than sufficient to enable a (forthcoming) reanalysis of downstream science products and the collection of larger surveys.
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