Документ взят из кэша поисковой машины. Адрес оригинального документа : http://xmm.vilspa.esa.es/sas/8.0.0/doc/arfgen/node25.html
Дата изменения: Wed Oct 22 15:41:49 2008
Дата индексирования: Tue Aug 18 10:09:45 2009
Кодировка:
Поисковые слова: arp 220

XMM-Newton Science Analysis System


arfgen (arfgen-1.75.6) [???]

Meta Index / Home Page / Description

Source Position

This task needs as input, in addition to the spectrum and detector map, the position of the source in question. This is currently used to determine the effective area (7.1), to calculate the encircled energy correction (7.5), to compute bounds for the flat and psf-type internal detector maps, and to construct the psf detector map distribution.

The task gets this information from one of two sources: from the centre of the source region in the input spectrum (if the parameter withsourcepos$=$false), or explicitly from the user (withsourcepos$=$true).

If the latter, the user can choose to specify the position in one of four coordinate systems: EQPOS, POS, TEL and DET. The coordinate system is specified through the parameter sourcecoords. The actual coordinates of the source can be inputted though the parameters sourcex and sourcey.