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  Gravitational waves from the inspiral of supermassive black holes in galactic-scale simulations

Mannerkoski, M., Johansson, P. H., Pihajoki, P., Rantala, A., & Naab, T. (2019). Gravitational waves from the inspiral of supermassive black holes in galactic-scale simulations. The Astrophysical Journal, 887(1): 35. doi:10.3847/1538-4357/ab52f9.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C190-D Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C191-C
Genre: Journal Article

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 Creators:
Mannerkoski, Matias, Author
Johansson, Peter H., Author
Pihajoki, Pauli, Author
Rantala, Antti, Author
Naab, Torsten1, Author              
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

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 Abstract: We study the orbital evolution and gravitational wave (GW) emission of supermassive black hole (SMBH) binaries formed in gas-free mergers of massive early-type galaxies using the hybrid tree-regularized N-body code Ketju. The evolution of the SMBHs and the surrounding galaxies is followed self-consistently from the large-scale merger down to the final few orbits before the black holes coalesce. Post-Newtonian corrections are included up to PN3.5 level for the binary dynamics, and the GW calculations include the corresponding corrections up to PN1.0-level. We analyze the significance of the stellar environment on the evolution of the binary and the emitted GW signal during the final GW emission dominated phase of the binary hardening and inspiral. Our simulations are compared to semi-analytic models that have often been used for making predictions for the stochastic GW background emitted by SMBHs. We find that the commonly used semi-analytic parameter values produce large differences in merger timescales and eccentricity evolution, but result in only ~10% differences in the GW spectrum emitted by a single binary at frequencies f≿10<sup>-1<7sup>yr<sup>-1</sup>, which are accessible by current pulsar timing arrays. These differences are in part caused by the strong effects of the SMBH binaries on the surrounding stellar population, which are not included in the semi-analytic models.

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 Dates: 2019-12-09
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.3847/1538-4357/ab52f9
Other: LOCALID: 3196556
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 887 (1) Sequence Number: 35 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3