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XMM-Newton CCF Release Note
XMM-CCF-REL-149
MOS columns with shifted energies
B. Altieri & J. Ballet
December 11, 2003
1 CCF components
Name of CCF VALDATE EVALDATE List of Blocks CAL XSCS
(start of val. period) (end of validity period) changed VERSION ag
EMOS1 BADPIX 0017 1999-12-10 06:30:00 2000-05-12 06:29:59 BADPIX NO
EMOS2 BADPIX 0017 1999-12-10 06:30:00 2000-05-12 06:29:59 BADPIX NO
EMOS1 BADPIX 0018 2000-05-12 06:30:00 2000-07-10 20:59:59 BADPIX NO
EMOS2 BADPIX 0018 2000-05-12 06:30:00 2000-07-10 20:59:59 BADPIX NO
EMOS1 BADPIX 0019 2000-07-10 21:00:00 2000-12-13 11:59:59 BADPIX NO
EMOS2 BADPIX 0019 2000-07-10 21:00:00 2000-12-13 11:59:59 BADPIX NO
EMOS1 BADPIX 0020 2000-12-13 12:00:00 2001-09-17 23:59:59 BADPIX NO
EMOS2 BADPIX 0020 2000-12-13 12:00:00 2001-09-17 23:59:59 BADPIX NO
EMOS1 BADPIX 0021 2001-09-18 00:00:00 2001-11-27 17:59:59 BADPIX NO
EMOS2 BADPIX 0021 2001-09-18 00:00:00 2001-11-27 17:59:59 BADPIX NO
EMOS1 BADPIX 0022 2001-11-27 18:00:00 2002-12-11 11:59:59 BADPIX NO
EMOS2 BADPIX 0022 2001-11-27 18:00:00 2002-12-11 11:59:59 BADPIX NO
EMOS1 BADPIX 0023 2002-12-11 12:00:00 BADPIX NO
EMOS2 BADPIX 0023 2002-12-11 12:00:00 BADPIX NO
2 Changes
The EPIC MOS cameras have columns where the energy of the pixels in all or part of the column are
shifted by up to 1 keV. Most of these columns exist since the Orsay ground (pre- ight) calibration
data (Pratt & Ballet, 2003).
The worst of these columns have been declared dead in this MOS BADPIX CCF.
1

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3 Scientic Impact of this Update
88 and 57 column segments have been added and declared as dead in all BADPIX CCFs for MOS1
and MOS2 respectively, covering the seven time periods since launch. The eect on the exposure
maps can be appreciated in gures 1 & 2.
Some minimal eective area will be lost with this shifted-energy column agging. Note that
none of these columns falls around or close to the nominal target boresight position.
Note that an error in the previous issue 13, now issue 21, covering the revolution range 325
to 361 was corrected: in this short period the defects from the micrometeoroid impact (rev 325)
were not agged as dead areas, while they were in the following period from rev 361 until the CCD
cooling (rev553), together with an on-board masking of the high-PHA hot pixels.
After the cooling, a large fraction of the few remaining hot pixels are the ones due to the
micrometeoroid impacts, although much less hoter, than before , both in terms of PHA (energy)
and recurrence frequency, (for instance, the MOS1 rev 325 meteoroid defects which are all located
in CCD 6 & 7). They are hence agged and masked in the on-board hot pixel tables, and agged
as such in the relevant bad pixel CCF (issue 16). But no dead area (3x3 pixels) due to pattern
migration has been agged anymore around the hotter of these defects (about 5 pixels per camera),
as they were in the past versions.
4 Estimated Scientic Quality
The energy scale for extended sources or point sources falling on a CCD area where one or several
shifted-energy columns are located will be improved, although at the expense of losing a bit of ux.
5 Test procedures & results
These new CCFs can be used only in conjunction with a new emevents (version 7.6 or higher) task,
that will be part of SAS v6 (January 2004 ?), otherwise events agged in these columnd with shifted
energies will not be handled correctly by the SAS. The SAS 5.4 version of emevents would simply
ignore them, so the events would still be here although the bad columns would be blanked out in
the exposure map.
These new CCFs have been tested with the local development version at VilSpa and at Saclay
by Jean Ballet: all expected columns are now properly masked.

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Figure 1: MOS1 exposure map with the 88 columns/segment masked out
6 Expected Updates
None.

XMM-Newton CCF Release XMM-CCF-REL-149 Page: 4
Figure 2: MOS2 exposure map with the 57 columns/segment masked out
7 References
Characterisation of MOS columns with shifted energies, EPIC-SAP-GWP-01, version
1.0, G.W. Pratt & J. Ballet, XMM-SOC-CAL-TN-0040