This memo describes two updates to the RMF model in the ACIS FI chips:
These products were tested against data from the onboard external calibration source (ECS) taken in the spring of 2000, and against astrophysical sources (mainly the supernova remnant 1E0102-72.3) from calendar year 2000.
The gains and line widths are accurate at energies from 1.5 to 6 keV. The gains in nearly every case to 0.3% or better, and the line widths to better than an ADU.
There remain systematic residuals in our E0102 fits at low energies (0.5-1.2 keV). Gain shifts of approximately 0.5-1% are not uncommon, and there may be issues with the line widths and/or astrophysical assumptions that went into the analysis.
Last modified: 11/15/10
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