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XMM­Newton CCF Release Note
XMM­CCF­REL­10
RGS Background Data
C. Erd
September 8, 2000
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
RGS1 BACKGROUND 0001 1998­01­01T00:00:00 PARTICLE --- NO
RGS2 BACKGROUND 0001 1998­01­01T00:00:00 PARTICLE --- NO
RGS1 CALSOURCEDATA 0001 1998­01­01T00:00:00 CALSOURCEREGIONS --- NO
RGS2 CALSOURCEDATA 0001 1998­01­01T00:00:00 CALSOURCEREGIONS --- NO
2 Changes
BACKGROUND The background data are implemented with dummy zero values. This will be updated
in the future, when a background model for becomes available.
CALSOURCEDATA Crude selection expressions for selection of calibration source data are provided.
The RGS CALSOURCEDATA are not currently used by the RGS processing by the SAS.
3 Scientific Impact of this Update
First release.
4 Estimated Scientific Quality
The accuracy of the intensity distribution of the calibration sources is about 10% for any given pixel.
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XMM­Newton CCF Release XMM­CCF­REL­10 Page: 2
Calibration sources may influence the order selected data, in particular for off­axis sources. Since
the SAS does not make use of this data at this point in time, the user is advised to check the images
of the RGS data in the cross­dispersion versus dispersion plane, and in the CCD PI versus dispersion
plane (see output of rgsimplot). In particular care must be taken for sources at off­axis angles close
to the edge of the FOV at the ­XDSP side.
The current approach by the RGS processing is to determine the background from the actual
data itself, rather than from calibration files.