Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21734416a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #344.16; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Wide Field Channel detector of the Advanced Camera for Surveys on board the Hubble Space Telescope was restored to operation during HST Servicing Mission 4 in May 2009. With new control electronics and almost nine years in low Earth orbit, the ACS WFC presents a variety of calibration challenges both old and new. These include mode-dependent bias gradients, bias striping noise, bad columns, cold columns, hot pixels, bad pixels, "scarring,” read-out amplifier crosstalk, and substantial charge-transfer inefficiency. Fortunately, most of these detector irregularities are already corrected or flagged by the existing ACS WFC calibration pipeline, designed prior to the WFC failure. However, our close inspection of post-SM4 calibration images, including bias frames, dark exposures, and astronomical reference fields has motivated us to modernize the WFC calibration pipeline so that we may continue to deliver images of the highest possible quality to the HST observer. We provide a quantitative summary of the various post-SM4 WFC image calibration issues, as well as our strategies for addressing them both within the automated calibration pipeline and outside the pipeline as optional stand-alone calibration utilities available to the HST user community.
Armstrong Amber
Golimowski Dave
Grogin Norman
Lim Paul
Smith Linda
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