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  Fast coalescence of massive black hole binaries from mergers of galactic nuclei: implications for low-frequency gravitational-wave astrophysics

Preto, M., Berentzen, I., Berczik, P., & Spurzem, R. (2011). Fast coalescence of massive black hole binaries from mergers of galactic nuclei: implications for low-frequency gravitational-wave astrophysics. The Astrophysical Journal Letters, 732(2): L26. doi:10.1088/2041-8205/732/2/L26.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-0807-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-0808-9
Genre: Journal Article

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1102.4855 (Preprint), 414KB
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 Creators:
Preto, Miguel1, Author
Berentzen, Ingo, Author
Berczik, Peter, Author
Spurzem, Rainer, Author
Affiliations:
1AEI-Golm, MPI for Gravitational Physics, Max Planck Society, Golm, DE, ou_24008              

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Free keywords: Astrophysics, Galaxy Astrophysics, astro-ph.GA,General Relativity and Quantum Cosmology, gr-qc
 Abstract: We investigate a purely stellar dynamical solution to the Final Parsec Problem. Galactic nuclei resulting from major mergers are not spherical, but show some degree of triaxiality. With $N$-body simulations, we show that massive black hole binaries (MBHB) hosted by them will continuously interact with stars on centrophilic orbits and will thus inspiral---in much less than a Hubble time---down to separations at which gravitational wave (GW) emission is strong enough to drive them to coalescence. Such coalescences will be important sources of GWs for future space-borne detectors such as the {\it Laser Interferometer Space Antenna} (LISA). Based on our results, we expect that LISA will see between $\sim 10$ to $\sim {\rm few} \times 10^2$ such events every year, depending on the particular MBH seed model as obtained in recent studies of merger trees of galaxy and MBH co-evolution. Orbital eccentricities in the LISA band will be clearly distinguishable from zero with $e \gtrsim 0.001-0.01$.

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 Dates: 2011-02-232011
 Publication Status: Published in print
 Pages: 6 pages, 4 figures, 1 table. Submitted to ApJL
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: arXiv: 1102.4855
DOI: 10.1088/2041-8205/732/2/L26
 Degree: -

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Title: The Astrophysical Journal Letters
  Other : Astrophys. J. Lett.
Source Genre: Journal
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Publ. Info: Chicago, IL : University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 732 (2) Sequence Number: L26 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: /journals/resource/954922828215