Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/docs/documents/CAL-SRN-0255-1-2.ps.gz Дата изменения: Fri Jul 17 17:19:21 2009 Дата индексирования: Mon Oct 1 22:56:53 2012 Кодировка: Поисковые слова: http astrokuban.info astrokuban

XMM­Newton CCF Release Note
XMM­CCF­REL­255
EPIC out of field­of­view description
C. M. H. Chen, R. D. Saxton
15 July 2009
1 CCF components
Name of CCF VALDATE EVALDATE Blocks changed XSCS flag
EMOS1 LINCOORD 0018.CCF 2000­01­01 CORNER NO
EMOS2 LINCOORD 0018.CCF 2000­01­01 CORNER NO
2 Changes
A new block, CORNER, has been added to the LINCOORD CCFs to describe the spatial
areas of the MOS detectors which are outside the field­of­view of the telescope.
3 Scientific Impact of this Update
This new block is read by the new task emtaglenoise beginning in SAS 9 as part of the
procedure to identify CCDs su#ering from low­energy noise in an observation, based on
an algorithm described in Kuntz and Snowden (2008) A&A 478, 575--596. As such, it
provides a new functionality in SAS.
4 Estimated Scientific Quality
Kuntz and Snowden (2008) have showed how, using this CORNER region specification,
one can e#ectively identify if CCDs 4 and 5 of MOS 1 and CCDs 2 and 5 of MOS 2
su#er from low­energy noise in all observations publicly available as of 1st April, 2006
(which numbered over 2000). The current specification of this CORNER region is taken
verbatim from Table 3 of Kuntz and Snowden (2008). As such, it makes possible the
exact replication of Kuntz and Snowden's classification results. It also provides a better
criterion than the OUT OF FOV flag (#XMMEA 16) for selecting pixels free of X­ray
1

photons (as opposed to electronic noise and charged particles), as it specifies the union of
regions outside the field of view that are free from contamination by light leak.
5 Test procedures and results
The SAS task emtaglenoise reads this new block via CAL calls:
GeometryDataServer *ct = 0; ct = calServer.getAtom(ct);
vector corners = ct­>corners();
Using the test harness of emtaglenoise, we have shown that the SAS task successfully
reads in and makes use of data in the new CORNER block, and subsequently produces
the expected low­energy noise classification on Fedora and Solaris, both in high­memory
mode.
2