Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4015d&link_type=abstract
American Astronomical Society, HEAD meeting #11, #40.15; Bulletin of the American Astronomical Society, Vol. 41, p.723
Astronomy and Astrophysics
Astrophysics
Scientific paper
The low-energy sensitivity of the ACIS instrument has been continuously degrading over the course of the Chandra mission due to the accumulation of a layer of contamination on the ACIS optical blocking filter. A model of this contaminant, now incorporated into the standardChandra calibration products, was developed, tested, and released in 2004. Until recently, it successfully accounted for the effects of the contamination. However, recent measurements of the thickness and spatial distribution of the contaminant show that it significantly diverges from the model. A new suite of models has been developed to account for the changes, and required extensive testing using both the on-board external calibration source measurements and observations of astrophysical sources used for calibration studies. We utilize several observations of the SMC Supernova Remnant 1E0102.2-7219 to test the models for the spectral, temporal, and spatial dependence of the contamination layer. 1E0102.2-7219 has a soft, line-dominated spectrum that is very sensitive to the additional absorption of the contamination layer. The extensive calibration observations of 1E0102.2-7219 over the course of the mission at several different locations and times on the ACIS I and S arrays provide additional constraints on the temporal and spatial dependence of the contamination model. This work was supported by NASA contract NAS8-39073.
DePasquale Joseph M.
Plucinsky Paul P.
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