Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 434, Issue 3, Pages 1946-1954Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1136
Keywords
accretion, accretion discs; black hole physics; hydrodynamics; galaxies: active; galaxies: evolution
Categories
Funding
- NASA [PF2-130098]
- STFC
- department of Business Innovation and Skills
- University of Leicester
- Science and Technology Facilities Council [ST/H002235/1, ST/K001000/1] Funding Source: researchfish
- STFC [ST/K001000/1, ST/H002235/1, ST/K000373/1] Funding Source: UKRI
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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 approximate to 70 per cent 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(4) 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 time-scales much shorter than a Hubble time. Disc tearing also suggests new observational signatures of accreting SMBH binaries and other systems such as protostellar binaries.
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