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XMM-Newton CCF Release Note
XMM-CCF-REL-143
Improved model of RGS instrumental Oxygen absorption
A. M. T. Pollock
December 19, 2002
1 CCF components
CCF component VALDATE EVALDATE Blocks changed XSCS ag
RGS1 EXAFS 0002 1999-01-01T00:00:00 H2O-P-CCD1 NO
H2O-P-CCD2
H2O-P-CCD3
H2O-P-CCD4
H2O-P-CCD5
H2O-P-CCD6
H2O-P-CCD7
H2O-P-CCD8
H2O-P-CCD9
RGS2 EXAFS 0002 1999-01-01T00:00:00 H2O-P-CCD1 NO
H2O-P-CCD2
H2O-P-CCD3
H2O-P-CCD4
H2O-P-CCD5
H2O-P-CCD6
H2O-P-CCD7
H2O-P-CCD8
H2O-P-CCD9
RGS1 QUANTUMEF 0008 1998-01-01T00:00:00 CCD DESC NO
RGS2 QUANTUMEF 0009 1998-01-01T00:00:00 CCD DESC NO
2 Changes
Cor de Vries of SRON Utrecht [1] has devised an improved model of the instrumental oxygen absorp-
tion feature based on a comparison of bright sources of relatively low and high interstellar absorption,
enabling a detailed model of the instrumental absorption. This information goes in two places : indi-
1

XMM-Newton CCF Release XMM-CCF-REL-143 Page: 2
vidual identical CCD tabulations in RGS%_EXAFS and RGS%_QUANTUMEF:CCD_DESC:D_H2O=75.515nm,
again identically for each CCD.
3 Scientic Impact of this Update
Better removal of instrumental eects from models of cosmic spectra.
4 Estimated Scientic Quality
Flux uncertainties near the oxygen edge at the few percent level, namely as good as through most
of the RGS waveband.
5 Expected Updates
None.
6 Test procedures
 Use fv to look at the new les and ensure that the oxygen data agree with the data supplied
by SRON Utrecht.
 Run cifbuild to check that the new les are correctly selected.
 Process the brightest Mkn421 data with the new les.
7 Summary of the test results
 fv shows that the new CCFs contain the correct data.
 The ccf.cif les made by cifbuild index the correct les.
 Data near the O-edge are well modelled.
References
[1] C. P. de Vries et al., The interstellar oxygen-K absorption edge as observed by XMM-Newton,
A&A, submitted, 2002.