XMM-Newton SAS Home Page
XMM-Newton Science Analysis System

eregionanalyse (especget-1.53.1) [xmmsas_20180620_1732-17.0.0]


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 extraction region 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
Background centre det or sky pixels -
optimum radius det/sky pixels optradius
optimum ellipse X radius det/sky pixels optellipxrad
optimum ellipse Y radius det/sky pixels optellipyrad
optimum ellipse rotangle degrees optelliprot
encircled energy factor - -
Total source counts$^{a}$ counts -
Total source count rate counts/s -
Statistical upper limit counts/s -
$^{a}$ The background subtracted source counts corrected for the encircled energy fraction.

XMM-Newton SOC/SSC -- 2018-06-20