منابع مشابه
Testing thermal reprocessing in AGN accretion discs
The thermal reprocessing hypothesis in AGN, where EUV/X-ray photons are reprocessed by the accretion disc into optical/UV photons, predicts wavelength-dependent time delays between the optical continuum at different wavelengths. Recent photometric monitoring by Sergeev et al. has shown that the time-delay is observed in 14 AGN, and generally seen to increase with increasing wavelength, as predi...
متن کاملTilted accretion discs in cataclysmic variables : Tidal instabilities and superhumps
We investigate the growth of tidal instabilities in accretion discs in a binary star potential, using three dimensional numerical simulations. As expected from analytic work, the disc is prone to an eccentric instability provided that it is large enough to extend to the 3:1 resonance. The eccentric disc leads to positive superhumps in the light curve. It has been proposed that negative superhum...
متن کاملTesting thermal reprocessing in active galactic nuclei accretion discs
The thermal reprocessing hypothesis in active galactic nuclei (AGN), where extreme ultraviolet/X-ray photons are reprocessed by the accretion disc into optical/UV photons, predicts wavelength-dependent time-delays between the optical continuum at different wavelengths. Recent photometric monitoring by Sergeev et al. has shown that the time-delay is observed in 14 AGN, and generally seen to incr...
متن کاملOn the thermal stability of transonic accretion discs
Nonlinear time-dependent calculations have been carried out in order to study the evolution of the thermal instability for vertically integrated, non self-gravitating models of optically thick, transonic, slim accretion discs around black holes. In these calculations we investigated only the original version of the slim disc model with low viscosity (α = 0.001) and for a stellar mass (10M⊙) bla...
متن کاملModelling magnetised accretion discs
Some recent results are reviewed that lead us now to believe that accretion discs are basically always magnetised. The main components are Balbus-Hawley and Parker instabilities on the one hand and a dynamo process on the other. A mechanical model for the Balbus-Hawley instability is presented and analysed quantitatively. Three-dimensional simulations are discussed, especially the resulting mag...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1976
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/177.1.65