Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/8.0.0/doc/eregionanalyse/node19.html
Дата изменения: Fri Oct 24 21:40:49 2008
Дата индексирования: Sat Oct 17 00:21:36 2009
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Поисковые слова: starspots

XMM-Newton Science Analysis System


eregionanalyse (especget-1.27.7) [???]

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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.