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Table 2

Characteristic average parameters of the eROSITA all-sky survey.

Survey duration 4.0 years 0.5 years
Sky region Extragalactic sky Ecliptic poles Extragalactic sky
Solid angle [deg2] 34 100 (|b| > 10°) 90 34 100 (|b| > 10°)
Exposure time [s] 2000 20 000 260

Energy band [keV] 0.5−2.0 2−10 0.5−2.0 2−10 0.5−2.0 2−10

Resolved extrag. CXB [%] 31 6 53 17 12 ≲1
Background counts [cts/PSF] 0.8 0.6 6.7 6.1 0.1 0.1
Source counts [cts/PSF] 7.6 6.8 16.5 15.6 4.4 3.9
Sensitivity ⟨Slim⟩ [10-14 erg s-1 cm-2] 1.1 18 0.23 4.2 4.8 80
Source density [deg-2] 84 3.7 450 37 10.0 0.4
Number of sources [× 103] 2900 130 41 3.4 340 13

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