Extended Data Fig. 5: Predicted Fe line luminosity of an isotropic and uniform gas cloud photonionized by a central AGN.
From: An energetic hot wind from the low-luminosity active galactic nucleus M81*
The upper (lower) panel is for Fe XXVI Lyα (XXV Kα). The ionization parameter is evaluated for an intrinsic X-ray spectrum same as M81* and over photon energy of 2–10 keV. The cloud has an equivalent hydrogen column density of NH = 1023cm−2 (black solid line), 1022cm−2 (red dash-dotted line) and 1021cm−2 (blue dashed line). The black dotted horizontal line in each panel marks the observed line luminosity, which is substantially higher than the predicted values.
