Tearing up the disc: misaligned accretion on to a binary

Дата и время публикации : 2013-06-28T20:00:04Z

Авторы публикации и институты :
Chris Nixon
Andrew King
Daniel Price

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 9 pages, 7 figures. Accepted to MNRAS. Simulation movies are available here: http://jila.colorado.edu/chrisnixon/tearing_binary.html
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: In a recent paper we have shown that the evolution of a misaligned disc around a spinning black hole can result in tearing the disc into many distinct planes. Tearing discs with random orientations produce direct dynamical accretion on to the hole in approximately 70% of all cases. Here we examine the evolution of a misaligned disc around a binary system. We show that these discs are susceptible to tearing for almost all inclinations. We also show that tearing of the disc can result in a significant acceleration of the disc evolution and subsequent accretion on to the binary – by factors up to 10,000 times that of a coplanar prograde disc with otherwise identical parameters. This provides a promising mechanism for driving mergers of supermassive black hole (SMBH) binaries on timescales much shorter than a Hubble time. Disc tearing also suggests new observational signatures of accreting SMBH binaries, and other systems such as protostellar binaries.

Category: Physics