Shock-accelerated non-thermal electrons produce AGN radio synchrotron and X-ray IC emission whose scalings with accretion rate and black-hole mass recover observed radio-loudness trends and fundamental-plane slopes.
Black hole X-ray binaries: A new view on soft-hard spectral transitions
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abstract
The theory of coronal evaporation predicts the formation of an inner hole in the cool thin accretion disk for mass accretion rates below a certain value (~ 1/50 of the Eddington mass accretion rate) and the sudden disappearance of this hole when the mass accretion rate rises above that value. The inner edge of the standard thin disk then suddenly shifts inward from about a few hundred Schwarzschild radii to the last stable orbit. This appears to quantitatively account for the observed transitions between hard and soft spectral states at critical luminosities. Due to the evaporation process the matter accreting in the geometrically thin disk changes to a hot coronal flow which proceeds towards the black hole as an advection-dominated accretion flow (ADAF; for a review see Narayan et al. 1998).
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A Shock-based Interpretation of Radio and X-ray Emission in Active Galactic Nuclei
Shock-accelerated non-thermal electrons produce AGN radio synchrotron and X-ray IC emission whose scalings with accretion rate and black-hole mass recover observed radio-loudness trends and fundamental-plane slopes.