XMM-Newton Science Analysis System: User Guide

4.7.4 Image generation with eimageget

The task eimageget generates EPIC vignetting-corrected background-subtracted images. The task only works on EPIC-pn Full Frame and Extended Full Frame mode and EPIC-MOS Full Frame mode exposures.

For a given science exposure the task generates the following set of files (Fig.24):

       Pobsid[PNpid,M1m1id,M2m2id]_ima_[0-4].fits     ; science exposure images
       PobsidPNpid_ima_[0-4]oot.fits                  ; Out-of-Time exposure images (only for PN)
       Pobsid[PNpid,M1m1id,M2m2id]_ima_[0-4]fwc.fits  ; Filter Wheel Close exposure images
       Pobsid[PNpid,M1m1id,M2m2id]_ima_[0-4]exp.fits  ; Exposure maps
       Pobsid[PNpid,M1m1id,M2m2id]_ima_mask.fits      ; A single mask valid for all energy bands

where obsid indicates the observation id and pid, m1id and m2id the ids of the EPIC-pn, EPIC-MOS1 and EPIC-MOS2 exposures respectively. The Out-of-Time event file is only generated for the case of EPIC-pn. [0-4] indicates the different energy ranges which can be controlled via task parameters, by default:

       0: 0.2-0.5 keV
       1: 0.5-1.0 keV
       2: 1.0-2.0 keV
       3: 2.0-4.5 keV
       4: 4.5-12.0 keV

The task eimagecombine can be used to conveniently combine the individual output images of eimageget to produce background-subtracted, vignetting-corrected, and smoothed image of EPIC exposures (Fig.24).

A dedicated SAS thread explains the detailed steps needed,

https://www.cosmos.esa.int/web/xmm-newton/sas-thread-images

Figure 24: The result of applying imageget to the EPIC-pn science exposure. Images correspond to the lowest energy range, 0.2-0.5 keV. From top lef to bottom right; science exposure image, scaled Out-of-Time exposure image, scaled Filter Wheel Close exposure image, and exposure map. The bottom figure is the result of applying eimagecombine to the above EPIC images produced by eimageget in the same energy range, 0.2-0.5 keV.