Sustaining a Warm Corona in Active Galactic Nuclei Accretion Discs

D. R. Ballantyne, X. Xiang

Warm coronae, thick (${\tau }_{\mathrm{T}}\approx 10$-$20$, where ${\tau }_{\mathrm{T}}$ is the Thomson depth) Comptonizing regions with temperatures of $\sim 1$ keV, are proposed to exist at…