Journal Article

Quasi-periodic flares from star–accretion-disc collisions

Lixin (Jane) Dai, Steven V. Fuerst and Roger Blandford

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 402, issue 3, pages 1614-1624
Published in print March 2010 | ISSN: 0035-8711
Published online February 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.16038.x
Quasi-periodic flares from star–accretion-disc collisions

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We present simulated results of quasi-periodic flares generated by the inelastic collisions of a star bound to a supermassive black hole and its attendant accretion disc. We show that the behaviour of the quasi-periodicity is affected by the mass and spin of the black hole and the orbital elements of the stellar orbit. We also evaluate the possibility of extracting useful information on these parameters and verifying the character of the Kerr metric from such quasi-periodic signals. Comparisons are made with the observed optical outbursts of OJ 287, infrared flares from the Galactic Centre and X-ray variability in RE J1034+396.

Keywords: accretion, accretion discs - radiative transfer; Galaxy: centre; galaxies: active; BL Lacertae objects: individual: OJ 287; galaxies: individual: RE J1034+396

Journal Article.  8468 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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