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XMM­Newton CCF Release Note
XMM­CCF­REL­0247
EPIC canned response matrices
I. de la Calle
October 1, 2008
1 Purpose
The generated EPIC canned response matrix files (RMFs) are described and published on a dedi­
cated web page at http://xmm2.esac.esa.int/external/xmm sw cal/calib/epic files.shtml and allow
the user to load them (together with source and background spectra of EPIC observations and
related ancillary matrices) into spectral analysis packages like XSPEC for model fitting.
RMFs can also be created by the users with help of the XMM­Newton Science Analysis Software
(SAS). The method using SAS is described in the SAS User's Guide and Data analysis threads:
RMFs are automatically adjusted to the spectra under study with respect to energy and pattern
selection.
The canned RMFs are nevertheless published for the following reasons:
. Mainly in the early years of the XMM­Newton mission, computer resources at users' institutes
were frequently rather slow with respect to the generation of RMFs. This situation probably
has improved for many users over the years but might still be present for some of them.
. Canned RMFs are useful for users preparing XMM­Newton observing proposals, e.g. when
simulating expected source spectra, without having to fully process data with the SAS.
. The concept of providing standard canned matrices allows calibration developments to proceed
independently of SAS releases.
. The source spectra produced as part of the pipeline processing of the Survey Science Centre
are associated with a set of specific standard RMFs.
Althought no ready­made MOS RMFs are provided as of SAS 6.5 (for reasons explained in the
web pages 'Update 2005­12­15' at http://xmm2.esac.esa.int/external/xmm sw cal/calib/epic files updates.shtml),
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for the purposes of the feasibility study of XMM­Newton proposals, a limited set of MOS response
files have been made available since SAS 7.1.0. These files are available for the full frame mode and
the current epoch, for:
. MOS1 and MOS2
. pattern 0 and pattern 0­12
. on­patch, wings of patch and o#­patch positions
More details on the generation of the canned response matrices can be found in:
. Generation of Canned pn Response Matrices, XMM­SOC­Procedure 03­01­0003­0001, 2007
http://xmm2.esac.esa.int/CCB/SOPH/Procedures/03/Attachments/01­0003­0001.pdf
The matrices are provided at: http://xmm2.esac.esa.int/external/xmm sw cal/calib/epic files.shtml
2 Changes
Response matrices have been generated for the latest SAS public release, i.e. version 8.0.0.
3 Scientific Impact of this Update
The matrices will allow the general user to spectrally analyze observations with corresponding
filter/mode/pattern/location and observing epoch settings. Further details are given on the web
page describing the canned matrices and in the SAS Manual and SAS threads.
4 Estimated Scientific Quality
In agreement with Scientific Quality reported for the corresponding public SAS release.
5 Test procedures & results
The canned response matrices have been created with the validated SAS 8.0.0 version. A test has
been carried out using data from the BL Lac objects 1ES0347­121 (0094381101) and MS02057+3509
(0084140501) to evaluate the impact of the canned response matrices on spectral data analysis. The

XMM­Newton CCF Release XMM­CCF­REL­0247 Page: 3
Table 1: EPIC­pn: Comparisson of best fit model parameters for the case in which a SAS generated
or canned response matrice is used.
Gal. NH Local NH F 2-10keV # # 2 /dof (dof)
pn 10 20 cm -2 10 20 cm -2 10 -11 erg cm -2 s -1
SAS RMF 3.64 < 0.4 3.00±0.01 1.82 +0.02
-0.01 1.09(633)
Canned RMF 3.64 0.5±0.3 2.99±0.01 1.84±0.02 1.11(633)
Table 2: EPIC­MOS: Comparisson of best fit model parameters for the case in which a SAS generated
or canned response matrice is used.
Gal. NH Local NH F 2-10keV # # 2 /dof (dof)
MOS 10 20 cm -2 10 20 cm -2 10 -12 erg cm -2 s -1
SAS RMF 6.28 7.2±1.8 3.46 +0.06
-0.12 2.34±0.07 1.13(146)
Canned RMF 6.28 7.5±1.8 3.46 +0.07
-0.08 2.35±0.07 1.14(146)
test involved spectral fitting using the standard generated SAS response matrice and the canned
response matrice. The validity of the canned response matrices has been assessed by comparisson
of the best fit model parameters. The model used is a power law convolved with galactic (fix) and
local absorption (free).
. pn: 1ES0347­121 Small Window observation. The correspondant canned response matrice has
been used (epn sw20 sY9 v7.0.rmf). Table 1 summarises the results.
. MOS: MS02057+3509 Full Frame observation. The correspondant canned response matrice
has been used (m1 onpatch pall 2008­07­28.rmf). Table 2 summarises the results.
The test concludes that, for the cases considered, the use of EPIC canned response matrices does
not introduce any systematic di#erence in the determination of the best fit parameters.
6 Expected Updates
These matriced will be updated in the future after every public SAS release and/or after major
changes in the EPIC calibration.