Successive Merger of Multiple Massive Black Holes in a Primordial Galaxy

Abstract

Using highly-accurate $N$-body simulations, we explore the evolution of multiple massive black holes (hereafter, MBHs) in a primordial galaxy that is composed of stars and MBHs. The evolution is pursed with a fourth-order Hermite scheme, where not only three-body interaction of MBHs but also dynamical friction by stars are incorporated. Initially, ten MBHs with equal mass of $10^7{M}_{\odot }$ are set in a host galaxy with $10^{11}{M}_{\odot }$. It is found that 4 - 6 MBHs merge successively within 1 Gyr, emitting gravitational wave radiation. The key process for the successive merger of MBHs is the dynamical friction by field stars, which enhances three-body interactions of MBHs when they enter the central regions of the galaxy. The heaviest MBH always composes a close binary at the galactic center, which shrinks owing to the angular momentum transfer by the third MBH and eventually merges. The angular momentum transfer by the third MBH is due to the sling-shot mechanism. We find that the secular Kozai mechanism does not work for a binary to merge if we include the relativistic pericenter shift. The simulations show that a multiple MBH system can produce a heavier MBH at the galactic center purely through $N$-body process. This merger path can be of great significance for the growth of MBHs in a primordial galaxy. The merger of multiple MBHs may be a potential source of gravitational waves for the Laser Interferometer Space Antenna (LISA) and pulsar timing.

5 pages, 3 figures, 1 table, accepted by ApJL

References in corpus (6)

• Large Merger Recoils and Spin Flips From Generic Black-Hole Binaries
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• Remnant Masses, Spins and Recoils from the Merger of Generic Black-Hole Binaries
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Cited by in corpus (7)

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• Dynamical friction and scratches of orbiting satellite galaxies on host systems
• Examining the effects of dark matter spikes on eccentric intermediate mass ratio inspirals using N-body simulations
• Dynamics of supermassive black hole triples in the ROMULUS25 cosmological simulation
• Properties of loss cone stars in a cosmological galaxy merger remnant
• Merger Criteria of Multiple Massive Black Holes and the Impact on the Host Galaxy