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Basic parameter of the eRosita instruments
number of mirror systems 7
number of nested mirror shells 54
HEW (Half energy Width) < 15" (on axis) to ~30" (survey) at 1 keV
energy range 0.5 - 10 KeV
diameter of 1 mirror system 358 mm
focal length 1600 mm
material of mirror shells nickel
mirror coating gold
detector principle framestore pn-CCD
size 28.8 x 28.8 mm (61 arcmin diameter)
Pixel size 75 x 75 μm
exposure time per frame 50 msec
energy resolution 138 eV at 6 keV
total weight of instrument 735 kg
Size (diameter / length) 1.3 m / 2.6 m
power consumption 352 Watt
mission lifetime > 7 years

eROSITA response matrices

eROSITA background document
(background spectrum coming soon!)

Predicted exposure map after the 4-years survey, based on the current mission scenario

Red Curve: the PSF HEW as function of the offaxis angle in pointing mode.
Blue Curve: the PSF HEW within an encircled off-axis angle during a scan. Basically the value at 30′, is the cumulative PSF in the survey.

The grasp of eROSITA compared with ROSAT-PSPC and XMM-Newton.


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