Massive Black Hole Recoil in High Resolution Hosts

Abstract

The final inspiral and coalescence of a black hole binary can produce highly beamed gravitational wave radiation. To conserve linear momentum, the black hole remnant can recoil with "kick" velocity as high as 4000 km/s. We present two sets of full N-body simulations of recoiling massive black holes (MBH) in high-resolution, non-axisymmetric potentials. The host to the first set of simulations is the main halo of the Via Lactea I simulation (Diemand et al. 2007). The nature of the resulting orbits is investigated through a numerical model where orbits are integrated assuming an evolving, triaxial NFW potential, and dynamical friction is calculated directly from the velocity dispersion along the major axes of the main halo of Via Lactea I. By comparing the triaxial case to a spherical model, we find that the wandering time spent by the MBH is significantly increased due to the asphericity of the halo. For kicks larger than 200 km/s, the remnant MBH does not return to the inner 200 pc within 1 Gyr, a timescale an order of magnitude larger than the upper limit of the estimated QSO lifetime. The second set of simulations is run using the outcome of a high-resolution gas-rich merger (Mayer et al. 2007) as host potential. In this case, a recoil velocity of 500 km/s cannot remove the MBH from the nuclear region.

4 pages, 4 figures. Proceedings of the conference Galactic & Stellar Dynamics In the Era of High Resolution Surveys

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Cited by in corpus (7)

• The Assembly of Supermassive Black Holes at High Redshifts
• Remnant Masses, Spins and Recoils from the Merger of Generic Black-Hole Binaries
• The formation of massive black holes in z~30 dark matter haloes with large baryonic streaming velocities
• Recoiling Massive Black Holes in Gas-Rich Galaxy Mergers
• Resonant recoil in extreme mass ratio binary black hole mergers
• Simulations of Recoiling Massive Black Holes in the Via Lactea Halo
• The Structure of Cold Dark Matter Halos: Recent Insights from High Resolution Simulations