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XMM­Newton CCF Release Note
XMM­CCF­REL­92
EPIC MOS Spectral Response Distribution
D Lumb
September 24, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 QUANTUMEF 0008.CCF 2000­01­01 QE CCDn NO
EMOS2 QUANTUMEF 0008.CCF 2000­01­01 QE CCDn NO
2 Changes
In the previous version of these files, the MOS detection efficiencies were changed to match those
used in the existing Leicester­supplied on­axis response matrices. It was found in fact that there
was a double­accounting For the fraction of events which are detected in each PATTERN type.
Especially at high energies this caused substantial errors, as the PATTERN 0­ 12 selection which
is used as default, contains only ¸50% of all events. Therefore the efficiencies represented in the
previous version (v0007) were lower than the pre­prepared response matrices in a manner which
worsened with increasing energy.
3 Scientific Impact of this Update
These updates should allow the SAS v5.2 tasks to return response matrices which are consistent to
within 1 ­ 2 % of the response matrices supplied by the instrument teams for on­axis.
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XMM­Newton CCF Release XMM­CCF­REL­92 Page: 2
4 Estimated Scientific Quality
There are remaining spectral residuals seen around the instrumental absorption edges such as O
(0.5keV), Al (1.49keV), Si (1.84keV) and Au (2.1 keV) . Adjusting systematic errors in the region
of these features to ¸5% in the spectrum files would be prudent.
5 Expected Updates
Future changes are expected to be real improvements in the physical data representing improved
knowledge of the instrument