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Global torques and ...
Global torques and stochasticity as the drivers of massive black hole pairing in the young Universe
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- Bortolas, Elisa (författare)
- University of Zurich
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- Capelo, Pedro R. (författare)
- University of Zurich
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- Zana, Tommaso (författare)
- Scuola Normale Superiore di Pisa
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- Mayer, Lucio (författare)
- University of Zurich
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- Bonetti, Matteo (författare)
- INFN Section of Milano,University of Milano-Bicocca
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- Dotti, Massimo (författare)
- University of Milano-Bicocca,INFN Section of Milano
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- Davies, Melvyn B. (författare)
- Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
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- Madau, Piero (författare)
- University of California, Santa Cruz
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(creator_code:org_t)
- 2020-08-29
- 2020
- Engelska 15 s.
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Ingår i: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 498:3, s. 3601-3615
- Relaterad länk:
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http://dx.doi.org/10...
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https://www.zora.uzh...
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- The forthcoming Laser Interferometer Space Antenna (LISA) will probe the population of coalescing massive black hole (MBH) binaries up to the onset of structure formation. Here, we simulate the galactic-scale pairing of ∼106 M☉ MBHs in a typical, non-clumpy main-sequence galaxy embedded in a cosmological environment at z = 7-6. In order to increase our statistical sample, we adopt a strategy that allows us to follow the evolution of six secondary MBHs concomitantly. We find that the magnitude of the dynamical-friction-induced torques is significantly smaller than that of the large-scale, stochastic gravitational torques arising from the perturbed and morphologically evolving galactic disc, suggesting that the standard dynamical friction treatment is inadequate for realistic galaxies at high redshift. The dynamical evolution of MBHs is very stochastic, and a variation in the initial orbital phase can lead to a drastically different time-scale for the inspiral. Most remarkably, the development of a galactic bar in the host system either significantly accelerates the inspiral by dragging a secondary MBH into the centre, or ultimately hinders the orbital decay by scattering the MBH in the galaxy outskirts. The latter occurs more rarely, suggesting that galactic bars overall promote MBH inspiral and binary coalescence. The orbital decay time can be an order of magnitude shorter than what would be predicted relying on dynamical friction alone. The stochasticity and the important role of global torques have crucial implications for the rates of MBH coalescences in the early Universe: both have to be accounted for when making predictions for the upcoming LISA observatory.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- Black hole physics
- Galaxies: bar
- Galaxies: evolution
- Galaxies: kinematics and dynamics
- Galaxies: nuclei
- Gravitational waves
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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