Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006head....9.1867d&link_type=abstract
American Astronomical Society, HEAD meeting #9, #18.67; Bulletin of the American Astronomical Society, Vol. 38, p.1291
Astronomy and Astrophysics
Astrophysics
Scientific paper
The spectral resolution of the ACIS CCDs continues to degrade slowly over time due to exposure to the space weather environment and elevated radiation. Utilizing Chandra's external calibration source (ECS) data, complimented by astrophysical data, we present an evaluation of the temporal and spatial CTI correction provided by the Chandra X-ray Center's CTI corrector for the ACIS Back-Illuminated (BI) CCDs. We have used the strong O, Ne, and Mg lines in the spectrum of the supernova remnant 1E0102.2-7219 to characterize the ACIS response below 1.5 keV, compensating for the lack of strong lines in this energy range in the on-board calibration source. Additionally, we use the strong Si and S lines in the supernova remnant Cassiopeia A to characterize the spectral response between the Al and Ti lines provided by the on-board calibration. For completeness, we compare our results to the CTI correction software provided by Penn State (Townsley et al, 2000,2002). This work was supported by NASA contract NAS8-39073.
DePasquale Joseph M.
Plucinsky Paul P.
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