Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/7.0.0/doc/omdetect/node13.html
Дата изменения: Thu Jun 29 00:51:54 2006
Дата индексирования: Sat Dec 22 10:49:45 2007
Кодировка:
Поисковые слова: sculptor galaxy

XMM-Newton Science Analysis System


omdetect (omdetect-5.6) [xmmsas_20060628_1801-7.0.0]

Meta Index / Home Page / Photometry

Extended Sources

For extended sources a different method is used to obtain the count-rates, since the above method is invalid for them. Each pixel of the source region is treated as a point-source and the counts obtained by summing the coincidence-loss corrected pixel counts. Please note that this method is only approximate- a more accurate method would require detailed modelling of the source.