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• W1969870816 endingPage "L24" @default.
• W1969870816 startingPage "L24" @default.
• W1969870816 abstract "Active galactic nuclei have been observed to vary stochastically with 10%–20% rms amplitudes over a range of optical wavelengths where the emission arises in an accretion disk. Since the accretion disk is unlikely to vary coherently, local fluctuations may be significantly larger than the global rms variability. We investigate toy models of quasar accretion disks consisting of a number of regions, n, whose temperatures vary independently with an amplitude of σT in dex. Models with large fluctuations (σT = 0.35–0.50) in 102–103 independently fluctuating zones for every factor of two in radius can explain the observed discrepancy between thin accretion disk sizes inferred from microlensing events and optical luminosity while matching the observed optical variability. For the same range of σT, inhomogeneous disk spectra provide excellent fits to the Hubble Space Telescope quasar composite without invoking global Compton scattering atmospheres to explain the high levels of observed UV emission. Simulated microlensing light curves for the Einstein cross from our time-varying toy models are well fit using a time-steady power-law temperature disk and produce magnification light curves that are consistent with current microlensing observations. Deviations due to the inhomogeneous, time-dependent disk structure should occur above the 1% level in the light curves, detectable in future microlensing observations with millimagnitude sensitivity." @default.
• W1969870816 created "2016-06-24" @default.
• W1969870816 creator A5054761800 @default.
• W1969870816 creator A5083799931 @default.
• W1969870816 date "2010-12-30" @default.
• W1969870816 modified "2023-10-11" @default.
• W1969870816 title "QUASAR ACCRETION DISKS ARE STRONGLY INHOMOGENEOUS" @default.
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• W1969870816 doi "https://doi.org/10.1088/2041-8205/727/1/l24" @default.
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