Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/docs/documents/CAL-SRN-0073-1-0.ps.gz Дата изменения: Fri May 4 16:17:44 2001 Дата индексирования: Mon Oct 1 21:56:58 2012 Кодировка: Поисковые слова: http www.sai.msu.su sn sncat

XMM­Newton CCF Release Note
XMM­CCF­REL­73
EPIC Spectral Response Distribution
D Lumb
April 27, 2001
1 CCF components
Name of CCF VALDATE List of Blocks
changed
CAL VERSION XSCS flag
EPN REDIST 0006.CCF 2000­01­01 BINNEDPI EBOUNDS NO
EBINS
EMOS1 REDIST 0010.CCF 2000­01­01 BINNEDPI EBOUNDS NO
EMOS2 REDIST 0010.CCF 2000­01­01 BINNEDPI EBOUNDS NO
2 Changes
These changes have been made to support the release of the rmfgen task for SAS v5.0.3. For the
PN modified the different tables to be coherent with gain calibration in response to SAS SPR [972]
''CAL getRedistribution and CAL gainCorrect are incoherent''. The BINNEDPI EBOUNDS now
contains what the EBOUNDS extension used to contain. The EBINS extension contains now the
PN RMF 972 row values Frank Haberl (MPE) supplied for the fixed response matrices. Previously
this contained 4096 values which made rmfgen task run 4 times more slowly.
The MOS BINNEDPI EBOUNDS was also modified so that the channel bins can be used for
future updates expected from Leicester University.
3 Scientific Impact of this Update
The data that have been changed in this release only affect the bin digitisation which is used in the
rmfgen task which mainly affects speed and not scientific quality.
1

XMM­Newton CCF Release XMM­CCF­REL­73 Page: 2
TheEBOUNDS extension is identical with the number of rows in the RMF supplied by the
instrument team (eg. 972 channels, whose spacing is designed to be non­linear so that the response
distribution which changes more rapidly at lower energies is better sampled
Extension PHA EBOUNDS defines the approximate PHA­energy relationship for quick­look
plotting purposes and the like ­ available to the SAS tasks through the CAL routine CAL getEbounds().
eBounds(i).lo ­ eBounds(i).hi corresponds to the energy bin for PHA channel i. In the EPIC case
the PHA channel is defined as the conversion from multiple energy info into a single energy value
for an event
Extension BINNEDPI EBOUNDS defines the (binned) PI­energy relationship (the PI­energy
relationship is trivially PI=eV), i.e., this is the first axis of the RMF in terms of real (gain/CTI
corrected) input energies. Currently we have this as equally spaced 5eVbins so that it slightly
oversamples the energy resolution scale of the detectors
Extension EBINS defines the second axis of the RMF in terms of real output energy bins i.e.
what is observed from the detector ­ available to the tasks through the CAL routine CAL getEbins()
4 Estimated Scientific Quality
The arfgen and rmfgen tasks should now produce comparable quality to the fixed responses
supplied until now by the instrument teams.
5 Expected Updates
Future changes are expected to be real improvements in the physical data representing improved
knowledge of the instrument