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Timescales of Quasar Accretion Discs from Low to High Black Hole Masses and new Variability Structure Functions at the High Masses
The UV-optical variability of quasars appears to depend on black-hole mass $M_{\rm BH}$ through physical timescales in the accretion disc. Here, we calculate mean emission radii, $R_{\rm mean}$, and orbital timescales, $t_{\rm orb}$, of thin accretion disc models as a function of emission wavelength from 1000 to 10000 Angstrom, $M_{\rm …