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Дата изменения: Mon Jul 9 10:18:11 2007
Дата индексирования: Sat Dec 22 14:01:42 2007
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Поисковые слова: universe

XMM-Newton Science Analysis System


eregionanalyse (especget-1.26) [xmmsas_20070708_1801-7.1.0]

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Description

This task is designed to analyse a region within an XMM image. It calculates values such as a source centroid, optimum extraction radius, source counts and count rate etc. All values are written to standard output where they may be accessed by a calling script. The centroid, source counts and optimum radius are also returned in output parameters where they may be picked up by a calling task. A summary of the output quantities is given in Table 1.

Table 1: Output quantities

Value	Units	Output Parameter
Source counts	counts	srccnts
Counts per image pixel	counts/pixel	-
Exposure time	seconds	-
X centroid	det or sky pixels	xcentroid
Y centroid	det or sky pixels	ycentroid
optimum radius	arcsecs and det/sky pixels	optradius
encircled energy factor	-	-
Total source counts$^{a}$	counts	-
Total source count rate	counts/s	-

$^{a}$ The background subtracted source counts corrected for the encircled energy fraction.