Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-04-04
Astronomy and Astrophysics
Astrophysics
Accepted by ApJ Letters; see http://www.astro.psu.edu/users/townsley/cti/
Scientific paper
10.1086/312672
The ACIS front-illuminated CCDs onboard the Chandra X-ray Observatory were damaged in the extreme environment of the Earth's radiation belts, resulting in enhanced charge transfer inefficiency (CTI). This produces a row dependence in gain, event grade, and energy resolution. We model the CTI as a function of input photon energy, including the effects of de-trapping (charge trailing), shielding within an event (charge in the leading pixels of the 3X3 event island protect the rest of the island by filling traps), and non-uniform spatial distribution of traps. This technique cannot fully recover the degraded energy resolution, but it reduces the position dependence of gain and grade distributions. By correcting the grade distributions as well as the event amplitudes, we can improve the instrument's quantum efficiency. We outline our model for CTI correction and discuss how the corrector can improve astrophysical results derived from ACIS data.
Broos Patrick S.
Garmire Gordon P.
Nousek John A.
Townsley Leisa Kay
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