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XMM­Newton CCF Release Note
XMM­CCF­REL­8
EPIC Spectral Response
D Lumb
October 3, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EMOS1 EFFICIENCY 0001 2000 01 01T00:00:00 EFFICIENCY YES
EMOS2 EFFICIENCY 0001 2000 01 01T00:00:00 EFFICIENCY YES
EPN EFFICIENCY 0001 2000 01 01T00:00:00 EFFICIENCY YES
EMOS1 QUANTUMEF 0006 2000 01 01T00:00:00 EBINS QE CCDn NO
EMOS2 QUANTUMEF 0006 2000 01 01T00:00:00 EBINS QE CCDn NO
EPN QUANTUMEF 0007 2000 01 01T00:00:00 EBINS QE CCDn NO
EMOS1 FILTRANSX 0005 2000 01 01T00:00:00 FILTER­name
EBINS
NO
EMOS2 FILTRANSX 0005 2000 01 01T00:00:00 FILTER­name
EBINS
NO
EPN FILTRANSX 0007 2000 01 01T00:00:00 FILTER­name
EBINS
NO
EMOS1 REDIST 0007 2000 01 01T00:00:00 CCD REDISTRIBUTION
PHE EBOUNDS
BINNEDPI EBOUNDS
NO
EMOS2 REDIST 0007 2000 01 01T00:00:00 CCD REDISTRIBUTION
PHE EBOUNDS
BINNEDPI EBOUNDS
NO
EPN REDIST 0004 2000 01 01T00:00:00 CCD REDISTRIBUTION
PHE EBOUNDS
BINNEDPI EBOUNDS
NO
2 Changes
First release
1

XMM­Newton CCF Release XMM­CCF­REL­8 Page: 2
The CCD efficiencies, filter transmissions and mirror collection area were all measured on­ground,
but to various levels of accuracy. The EPIC CCD efficiency measurements were made in a syn­
chrotron facility, but there were discrepant values whose nature remained unresolved.
Files xxx EFFICIENCY include the spatial and energy dependence of CCD detection efficiency.
They are arranged with efficiencies ofeach pattern type. Thus the efficiency of the nominal MOS
sepctral pattern type selection is built up from the rows pertaining to pattern types 0 -- 12, while
for PN the equivalent data are for PAT TYP=0 -- 1.
The files xxx REDIST contain the coefficients used in the code to build observtaion­specific
response matrices.
3 Scientific Impact of this Update
First release
4 Estimated Scientific Quality
A combination of reconciling with theoretical models, and measurement of spectral residuals in­orbit
has been undertaken, such that for some targets, spectral discrepancies at less than the 10% level
have been obtained. Progress is being made for pathological cases of soft and hard sources, and in
understanding the consequences of pile­up.
As ever, progress in improving the spectral response knowledge will continue to develop with
more widespread use of data sets of different quality and characteristics. In the mean time users
should be aware not to over­interpret spectral features near instrument absorption edges, and at
the extremes of energy range, nor at count rates inappropriate to the readout mode of use. Namely
energies Ÿ300eV, around C K (280ev) O K (540eV), ALk (1.55keV), Si K (1.84keV) and Au M
(2.3keV) edges, and at energies –8keV.
5 Expected Updates
The mode dependencies of the EPIC cameras is uncertain yet with respect to the spectral response.
While it is hoped that the gain dependencies cover all aspects of mode changes, it is possible that
at least in timing mode, the 1­d clocking scheme causes events to be merged, and so the response
distributions may ALSO be different