Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/docs/documents/CAL-SRN-0170-1-1.ps.gz Дата изменения: Mon Jun 14 18:35:01 2004 Дата индексирования: Mon Oct 1 22:26:34 2012 Кодировка: Поисковые слова: п п п п п п

XMM-Newton CCF Release Note
XMM-CCF-REL-170
MOS Filter Transmission
M.J.S. Smith
June 14, 2004
1 CCF components
Name of CCF VALDATE EVALDATE Blocks Changed CAL Version XSCS Flag
EMOS1
FILTERTRANSX 0012
1998-01-01T00:00:00 { FILTER-THIN1,
-THIN2,
-MEDIUM,
-THICK,
-OPEN, EBINS
NO
EMOS2
FILTERTRANSX 0012
1998-01-01T00:00:00 { FILTER-THIN1,
-THIN2,
-MEDIUM,
-THICK,
-OPEN, EBINS
NO
2 Changes
These CCFs basically combine the Thin and Medium lter transmissions of issue 0010 with the
Thick lter transmission of issue 0011.
Although the detailed history of the CCF lter transmission changes may be found in their
respective release notes, some relevant recent changes are summarised here.
Issue 0011 was a slightly modied re-release of an earlier issue (0006) which resulted in a signif-
icantly improved cross lter consistency with respect to issue 0010. This improvement was almost
wholly due to the changes in the Thick lter transmission data (which, in issue 0011, reverted to
the BESY ground calibration data). Issue 0011 also resulted in slightly changed Thin and Medium
lter transmissions and the energy binning as compared to issue 0010.
1

XMM-Newton CCF Release XMM-CCF-REL-170 Page: 2
However, it is assumed that the Thin and Medium lters are identical for each of the EPIC
instruments. Therefore, in this new issue 0012, the MOS Thin and Medium lter transmission values
are brought back into line with the respectively identical PN Thin and Medium lter transmissions
of EPN FILTERTRANSX 0013.CCF by using the issue 0010 values.
The MOS Thick lter transmission data of issue 0011 do however provide the most consistent
results between lters (as described in its release note), and are therefore maintained. Owing to
the required common energy bin structure, the Thick lter transmission values of issue 0012 were
obtained by linearly interpolating the generally sparser issue 0011 Thick lter data to t Thin and
Medium lter energy binning. See Figures 1 and 2 for comparisons of old and new transmission
values.
3 Scientic Impact of this Update
The results of an analysis of a PKS2155-304 observation (obsid 0124930301) in which the MOS2
was observing with Medium lter and the MOS1 was cycled through lters is presented in Figure 3.
These plots show the data to model ratios of the simultaneous best ts for the various combinations
of data sets. Use of the new CCF results in a slightly better cross lter consistency for the Medium
versus Thick lters which is evidenced by the tighter data to model ratio below 0.35 keV, whereas the
two other lter combinations (Medium-Thin and Medium-Medium) show no signicant dierence
with respect to the previous CCF issue.
Owing to the slightly higher transmission in the  0.8{1.0 keV band for the Medium and espe-
cially the Thin lter one may expect a corresponding increase in ux of a few percent.
4 Estimated Scientic Quality
The lter transmission values for MOS1, MOS2 and PN (Thin and Medium) are currently the same,
although the lters are not identical. Moreover, the spatial variations around the C edge of the Thick
lter is not handled in the CCF.
5 Expected Updates
As more calibration data is analysed there may be improvements in the transmission curves. Spatial
region expressions may be introduced to handle the spatial variation of the Thick lter transmission
in particular.

XMM-Newton CCF Release XMM-CCF-REL-170 Page: 3
Figure 1: Comparison of the MOS Thick lter transmissions of the previous (red) and new (green)
CCF issues, in the bands 0.04 { 0.6 keV (top) and 0.6 { 20 keV (bottom). The new values are
derived from the previous values interpolated to t the generally ner energy binning. The resulting
dierences are very small, especially above 100 eV where the transmission values are practically
identical.

XMM-Newton CCF Release XMM-CCF-REL-170 Page: 4
Figure 2: Comparison of the MOS Thin (top) and Medium (bottom) lter transmissions of the
previous (red) and new (green) CCF issues. The dierences in transmission are mainly at the C-
edge and at  0.8{1.0 keV (where the transmission is approximately up to 3% higher the new CCF
issue). The dierences between the issue 0011 and issue 0012 transmissions at the C-edge are the
same as those between the issues 0006 and 0010 and are described in XMM-CCF-REL-47; they
are mainly due to the orginal model (based on Orsay ground calibration combined with the Henke
coeфcients) being modied by an edge structure extracted from ACIS blocking lter measurements.

XMM-Newton CCF Release XMM-CCF-REL-170 Page: 5
Figure 3: Comparison of data to model ratio of simultaneous observations of PKS 2155-304. At left
the results for the previous CCF issue, at right those for the the new issue. Black: MOS2 Medium
lter, Red: MOS1 Thin (top), Medium (middle) and Thick (bottom). The ratios were obtained
from the respective best simutaneous ts to absorbed broken powerlaw models.

XMM-Newton CCF Release XMM-CCF-REL-170 Page: 6
6 Test procedures
Functional testing with calview and arfgen. Comparison with previous transmission values using
calview.
7 Summary of the test results
See Section 3