ACS after SM4: Crosstalk Measurements

Details ACS after SM4: Crosstalk Measurements ACS after SM4: Crosstalk Measurements

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21546203s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #462.03; Bulletin of the American Astronomical Society, Vol. 42, p.493

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Scientific paper

An object imaged on a quadrant of an ACS WFC frame may show up in the other three quadrants as a faint, negative, mirror-symmetric ``ghost''. The effect is due to electronic crosstalk between the four amplifiers as the WFC CCDs are read out. Before SM4, it was responsible for pronounced ghost images at source signals ranging from 100 to 1000 e-. The replacement CCD Electronics Box (CEB-R) installed during SM4 mitigated but not eliminated this effect. At source signals near the pixel full-well limit, crosstalk remains at levels similar to those existing before SM4, with the crosstalk-to-signal ratio of 1/10000, or 10 e-/pix. But it dropped by more than a factor of two for source signals below 1000 e-. As a result, no ghosts show up in the images taken after SM4.
Because of the faintness of ghost images, crosstalk was never a problem for ACS WFC science before SM4. The available data suggests that it is of even less concern after SM4.

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