Fig. 8

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Hardness ratio distribution for the extragalactic AGN subsample as a function of spectroscopic classification from SDSS. The vertical dotted line indicates the hardness ratio expected for an absorbed power law with photon index Γ = 1.8 and Galactic column density typical of eFEDS of NH = 3 × 1020 cm−2. Objects with broad optical lines (Type 1 classification) dominate the sample, but some of these show large hardness ratios indicative of X-ray absorption. The AGN without broad lines or without spectroscopic classifications show systematically larger values of the hardness ratio, indicating that they are obscured.
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