SIMBAD references

2019MNRAS.488.2825F - Mon. Not. R. Astron. Soc., 488, 2825-2835 (2019/September-2)

Black hole and neutron star mergers in galactic nuclei: the role of triples.


Abstract (from CDS):

Nuclear star clusters that surround supermassive black holes (SMBHs) in galactic nuclei are thought to contain large numbers of black holes (BHs) and neutron stars (NSs), a fraction of which form binaries and could merge by Kozai-Lidov oscillations (KL). Triple compact objects are likely to be present, given what is known about the multiplicity of massive stars, whose life ends either as an NS or a BH. In this paper, we present a new possible scenario for merging BHs and NSs in galactic nuclei. We study the evolution of a triple black hole (BH) or neutron star (NS) system orbiting an SMBH in a galactic nucleus by means of direct high-precision N-body simulations, including post-Newtonian terms. We find that the four-body dynamical interactions can increase the KL angle window for mergers compared to the binary case and make BH and NS binaries merge on shorter time-scales. We show that the merger fraction can be up to ∼5-8 times higher for triples than for binaries. Therefore, even if the triple fraction is only ∼10-20percent of the binary fraction, they could contribute to the merger events observed by LIGO/VIRGO in comparable numbers.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): stars: kinematics and dynamics - Galaxy: centre - Galaxy: kinematics and dynamics - galaxies: star clusters: general

Simbad objects: 11

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