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arfgen (arfgen-1.102) [xmmsas_20211130_0941-20.0.0]

Example 8: Finding the cross-region ARF

arfgen crossregionarf=yes spectrumset=spec_output.ds crossreg_spectrumset=spec_input.ds detmaptype=dataset detmaparray=image200.ds

This command returns the effective area in a region of the detector (defined in spec_output.ds) coming from the PSF overflow of flux from the sky region defined in spec_input.ds. The detmaparray, image200.ds, should be an image which includes both detector regions with a pixel size which is small compared to the size of the regions. It is recommended that the number of detmaparray pixels which falls within the spec_output.ds region is $>300$ to properly sample the region. But please note that this calculation is very compute intensive and very fine detector maps will lead to a very long run time.

XMM-Newton SOC -- 2021-11-30