An Empirical Pixel-Based CTE Correction for ACS/WFC

Details An Empirical Pixel-Based CTE Correction for ACS/WFC An Empirical Pixel-Based CTE Correction for ACS/WFC

Jul 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010hstc.worke..30a&link_type=abstract

"2010 Space Telescope Science Institute Calibration Workshop - Hubble after SM4. Preparing JWST, held 21-23 July 2010 at Space T

Physics

Scientific paper

This presentation summarizes a paper that has been recently published in PASP, Anderson & Bedin (2010). The paper describes our pixel-based approach to correcting ACS data for imperfect CTE (charge-transfer efficiency). We developed the approach by characterizing the size and profiles of trails behind warm pixels in dark exposures. We found an algorithm that simulates the way imperfect CTE impacts the readout process. To correct images for imperfect CTE, we use a forwardmodeling procedure to determine the likely original distribution of charge, given the distribution that was read out. We applied this CTE-reconstruction algorithm to science images and found that the fluxes, positions and shapes of stars were restored to high fidelity. The ACS team is currently working to make this correction available to the public; they are also running tests to determine whether and how best to implement it in the pipeline.

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