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XMM-Newton CCF Release Note
XMM-CCF-REL-133
EPIC MOS gain
M. Kirsch
December 12, 2002
1 CCF components
Name of CCF VALDATE EVALDATE List of Blocks CAL XSCS
(start of val. period) (end of validity period) changed VERS. ag
EMOS1 ADUCONV 0019 2002-11-07T05:00:01 OFFSET GAIN NO
EMOS2 ADUCONV 0019 2002-11-07T05:00:01 OFFSET GAIN NO
2 Changes
A new ADUCONV CCF has been generated from the values derived by Leicester after the cooling
of the cameras.
3 Scientic Impact of this Update
The update takes the change in gain of the cold MOS cameras into account. In combination with
the EMOS* CTI 0015.CCF there is no scientic impact on the data despite of the positive fact,
that the ernergy resolution with the cold camera has improved by a factor of 0.85. See gure 1 and
gure 2.
4 Estimated Scientic Quality
The CCF takes the post cooling condition for the gain into account. Figure 3 shows corrected MOS1
pre- and post-cooling spectra. There's no signifcant shift in the observed line features or evidence
1

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Figure 1: Mn and Al SAS reconstructed line width for MOS1 CCD1 with the new ADUCONV
CCFs 15-19, for pattern 0, since launch. The red dot shows the situation post cooling
Figure 2: Mn and Al SAS reconstructed line width for MOS2 CCD1 with the new ADUCONV
CCFs 15-19, for pattern 0, since launch. The red dot shows the situation post cooling

XMM-Newton CCF Release XMM-CCF-REL-133 Page: 3
for contamination.
Figure 3: Vela SNR spectra of the MOS1 camera pre and post cooling. black:pre cooling, red:post
cooling
5 Test procedures & results
The new ADUCONV CCFs have been tested with the Development Track (DT) version of the SAS
at VilSpa using the observation 0142860201 of rev. 536 for functional test. Furthermore Leicester
performed tests with the Development Track (DT) version of the SAS on the observations:
0156960101: Vela SNR in rev. 533 (pre cooling)
0156960301: Vela SNR in rev. 534 (post cooling)
In adition the new ADUCONV CCFs 12-19 have been tested with the Development Track (DT)
version of the SAS at VilSpa using all available CALCLOSED observations. The reconstructed line
position for the CALCLOSED observation 0156960501 from revolution 533 (cold camera) is at the
correct position for Mn and Al for both cameras. See gure 4 and gure 5.

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Figure 4: Mn and Al SAS reconstructed line positions for MOS1 CCD1 with the new ADUCONV
CCFs 15-19, for pattern 0, since launch. The red dot shows the situation post cooling
Figure 5: Mn and Al SAS reconstructed line positions for MOS2 CCD1 with the new ADUCONV
CCFs 15-19 , for pattern 0, since launch. The red dot shows the situation post cooling

XMM-Newton CCF Release XMM-CCF-REL-133 Page: 5
6 Expected Updates
The ADUCONV CCFs could be tuned further to limit the slight over-correction (see also XMM-
CCF-REL-125).