Properties of loss cone stars in a cosmological galaxy merger remnant
arXiv:2011.08216 · doi:10.1051/0004-6361/202039698
Abstract
Aims: We investigate the orbital and phase space properties of loss cone stars that interact strongly with a hard, high-redshift binary supermassive black hole (SMBH) system formed in a cosmological scenario. Methods: We use a novel hybrid integration approach that combines the direct N-body code -GRAPE with ETICS, a collisionless code that employs the self-consistent field method for force calculation. The hybrid approach shows considerable speed-up over direct summation for particle numbers , while retaining accuracy of direct N-body for a subset of particles. During the SMBH binary evolution we monitor individual stellar interactions with the binary in order to identify stars that noticeably contribute to the SMBH binary hardening. Results: We successfully identify and analyze in detail the properties of stars that extract energy from the binary. We find that the summed energy changes seen in these stars match very well with the overall binary energy change, demonstrating that stellar interactions are the primary drivers of SMBH binary hardening in triaxial, gas-poor systems. The slight triaxiality of our system results in efficient loss cone refilling, avoiding the final parsec problem. We distinguish three different populations of interactions based on their apocenter. We find a clear prevalence of interactions co-rotating with the binary. Nevertheless, retrograde interactions are the most energetic, contributing only slightly less than the prograde population to the overall energy exchange. The most energetic interactions are also likely to result in a change of sign in the angular momentum of the star. We estimate the merger timescale of the binary to be , a value larger by a factor of two than the timescale reported in a previous study.
17 pages, 13 figures, 2 tables; accepted for publication in Astronomy & Astrophysics
References in corpus (37)
- Laser Interferometer Space Antenna
- The SAURON project -- X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/sigma,epsilon) diagram with integral-field stellar kinematics
- A Compact Supermassive Binary Black Hole System
- A massive binary black-hole system in OJ287 and a test of general relativity
- Massive black hole binary mergers within sub-pc scale gas discs
- The Quest for Dual and Binary Supermassive Black Holes: A Multi-Messenger View
- Interaction of massive black hole binaries with their stellar environment: I. Ejection of hypervelocity stars
- Implementing Few-Body Algorithmic Regularization with Post-Newtonian Terms
- Massive binary black holes in galactic nuclei and their path to coalescence
- The Local Nanohertz Gravitational-Wave Landscape From Supermassive Black Hole Binaries
- Performance Analysis of Direct N-Body Algorithms on Special-Purpose Supercomputers
- Self consistent model for the evolution of eccentric massive black hole binaries in stellar environments: implications for gravitational wave observations
- The erratic dynamical life of black hole seeds in high-redshift galaxies
- The Argo Simulation: I. Quenching of Massive Galaxies at High Redshift as a Result of Cosmological Starvation
- A milliparsec supermassive black hole binary candidate in the galaxy SDSS J120136.02+300305.5
- Interactions between multiple supermassive black holes in galactic nuclei: a solution to the final parsec problem
- Collisionless loss-cone refilling: there is no final parsec problem
- Interaction of massive black hole binaries with their stellar environment: III. Scattering of bound stars
- A candidate sub-parsec binary black hole in the Seyfert galaxy NGC 7674
- Dynamical friction of massive objects in galactic centres
- The Argo Simulation: II. The Early Build-up of the Hubble Sequence
- NGC6240: A triple nucleus system in the advanced or final state of merging
- Axisymmetric orbit models of N-body merger remnants: a dependency of reconstructed mass on viewing angle
- Global torques and stochasticity as the drivers of massive black hole pairing in the young Universe
- Improved gravitational radiation time-scales: significance for LISA and LIGO-Virgo sources
- Galaxy Rotation and Supermassive Black Hole Binary Evolution
- Supermassive Black Hole Binaries: The Search Continues
- SMBH in Galactic Nuclei with Tidal Disruption of Stars
- On the eccentricity evolution of massive black hole binaries in stellar backgrounds
- Accelerated orbital decay of supermassive black hole binaries in merging nuclear star clusters
- The lifetime of binary black holes in Sérsic galaxy models
- Defeating stochasticity: coalescence timescales of massive black holes in galaxy mergers
- Improved gravitational radiation time-scales II: spin-orbit contributions and environmental perturbations
- Inward Bound: The incredible journey of massive black holes as they pair and merge; I. The effect of mass ratio in flattened rotating galactic nuclei
- Expansion Techniques for Collisionless Stellar Dynamical Simulations
- Star cluster disruption by a massive black hole binary
- Evolution of supermassive black hole binaries and tidal disruption rates in nonspherical galactic nuclei