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XMM­Newton CCF Release Note
XMM­CCF­REL­65
RGS Line Spread Function
C. Erd
March 30, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
RGS1 LINESPREADFUNC 0003 1999­01­01T00:00:00 FIGURE, BOWS xmmsas 20010329 1900 NO
RGS2 LINESPREADFUNC 0003 1999­01­01T00:00:00 FIGURE, BOWS xmmsas 20010329 1900 NO
XMM MISCDATA 0012 1999­01­01T00:00:00 MISCDATA --- NO
2 Changes
LINESPREADFUNC
ffl addition of table BOWS to hold the parameters of the non­flatness distribution of the
grating plates
ffl addition of factor SCALE in table FIGURE to scale the assembly time misalignment distri­
bution (see [1, function CAL getRGAFigure])
MISCDATA the value of ROWLAND of RGS2 was changed such that L = 2R cos fl 0 = 6706 mm
3 Scientific Impact of this Update
These changes implement the analysis of the RGS LSF as described in [2]. Together with the defocus
function (see [1, function CAL getRFCdefocus]), and the CCF's XRT1 XPSF 0004, XRT2 XPSF 0004
this should all correct the deficiencies of the RGS LSF as described below.
1

XMM­Newton CCF Release XMM­CCF­REL­65 Page: 2
4 Estimated Scientific Quality
This should cure the problem of the LSF of being too narrow, as being previously derived by
rgsrmfgen. It was found that when using the response matrix from rgsrmfgen, due to the narrow
SAS LSF the superposition of all modeled wings is not sufficient to describe the pseudo­continuum
created by the true data superposition of the wings. Also near a bright line, there are more points
close to the ``background'' than in the line, therefore the fitting procedure tries to put the model
within the error bars of these points (the surrounding continuum has a larger weight than the
line). These two effects force the fitting program to add a featureless continuum, basically a high­T
component.
References
[1] Christian Erd, Phillipe Gondoin, David Lumb, Rudi Much, Uwe Lammers, and Giuseppe Va­
canti. Calibration Access and Data Handbook. XMM­PS­GM­20, issue 1.0, ESA/SSD, September
2000. http://xmm.vilspa.esa.es/calibration/docs/general/calhb.ps.gz.
[2] A. Rasmussen. Tuining and Assessment of the RGS LSF model appropriate
for Response Matrix Generation. RGS­COL­CAL­01002, Columbia, March 2001.
http://xmm.astro.columbia.edu/cal files/cal01002.ps.