Microlensing evidence for super-Eddington disc accretion in quasars
Article first published online: 20 NOV 2012
© 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS
Monthly Notices of the Royal Astronomical Society
Volume 427, Issue 3, pages 1867–1876, 11 December 2012
How to Cite
Abolmasov, P. and Shakura, N. I. (2012), Microlensing evidence for super-Eddington disc accretion in quasars. Monthly Notices of the Royal Astronomical Society, 427: 1867–1876. doi: 10.1111/j.1365-2966.2012.21881.x
- Issue published online: 20 NOV 2012
- Article first published online: 20 NOV 2012
- Manuscript Accepted: 7 AUG 2012
- Manuscript Received: 6 AUG 2012
- RFBR. Grant Number: 12-02-00186-a
- accretion, accretion discs;
- gravitational lensing: micro;
- quasars: general.
Microlensing by the stellar population of lensing galaxies provides an important opportunity to resolve the accretion disc structure spatially in strongly lensed quasars. Disc sizes estimated in this way are on average larger than the predictions of the standard Shakura–Sunyaev accretion disc model. An analysis of the observational data on microlensing variability suggests that some fraction of lensed quasars (primarily smaller-mass objects) are accreting in the super-Eddington regime. Super-Eddington accretion leads to the formation of an optically thick envelope scattering the radiation formed in the disc. This makes the apparent disc size larger and practically independent of wavelength. In the framework of our model, it is possible to make self-consistent estimates of mass accretion rates and black hole masses for the cases when both amplification-corrected fluxes and radii are available.