Chandra/ACIS Subpixel Event Repositioning. II. Further Refinements and Comparison between Backside and Front-side Illuminated X-ray CCDs

Kavli Affiliate: Gregory Y. Prigozhin

| First 5 Authors: Jingqiang Li, Joel H. Kastner, Gregory Y. Prigozhin, Norbert S. Schulz, Eric D. Feigelson

| Summary:

We further investigate subpixel event repositioning (SER) algorithms in
application to Chandra X-ray Observatory (CXO) CCD imaging. SER algorithms have
been applied to backside illuminated (BI) Advanced CCD Imaging Spectrometer
(ACIS) devices, and demonstrate spatial resolution improvements in Chandra/ACIS
observations. Here a new SER algorithm that is charge split dependent is added
to the SER family. We describe the application of SER algorithms to frontside
illuminated (FI) ACIS devices. The results of SER for FI CCDs are compared with
those obtained from SER techniques applied to BI CCD event data. Both simulated
data and Chandra/ACIS observations of the Orion Nebular Cluster were used to
test and evaluate the achievement of the various SER techniques.

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