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XMM­Newton CCF Release Note
XMM­CCF­REL­27
EPIC Filter Transmission
D Lumb
October 6, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 FILTRANSX 0006 2000 01 01T00:00:00 FILTER­THICK NO
EMOS2 FILTRANSX 0006 2000 01 01T00:00:00 FILTER­THICK NO
EPN FILTRANSX 0008 2000 01 01T00:00:00 FILTER­THICK NO
2 Changes
The data for the THICK filter have been changed to match the measurements made by the MPE
team at BESY.
3 Scientific Impact of this Update
First release There should be better fitting of low energy spectra when the THICK filter is utilised.
4 Estimated Scientific Quality
Measurements of the same objects in different filters in Lockman Hole field suggested the transmis­
sion of THICK filter was under­estimated by about 10%. This is a little borne out by measurements
of CAL83 in different filters.
1

XMM­Newton CCF Release XMM­CCF­REL­27 Page: 2
Comparison between measured data from BESY and that of the old CCF file show a discrepancy
of about the required magnitude. This filter only then is changed.
Figure 1:
5 Expected Updates
We know there are spatial variations around the C edge of THICK filter, and that not all filters are
identical. These features will have to be updated.