Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/6.5.0/doc/eregionanalyse/node16.html
Дата изменения: Tue Aug 16 10:28:59 2005
Дата индексирования: Sat Dec 22 14:03:32 2007
Кодировка:
Поисковые слова: annular solar eclipse

XMM-Newton Science Analysis System


eregionanalyse (especget-1.19) [xmmsas_20050815_1803-6.5.0]

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Encircled energy factor

The fraction of counts contained within the source region assuming a point source located at the centre of the region. The EXTENDED mode (King profile) PSF is used to calculate the fraction assuming a fixed photon energy of 1.5 keV. This is currently only implemented for circular source regions, other shapes will give the wrong factor.