Effects of Minor Mergers on Coalescence of a Supermassive Black Hole Binary
arXiv:0812.4473 · doi:10.1093/pasj/61.3.421
Abstract
We study the possibility that minor mergers resolve the loss cone depletion problem, which is the difficulty occured in the coalescence process of the supermassive black hole (SMBH) binary, by performing numerical simulations with a highly accurate -body code. We show that the minor merger of a dwarf galaxy disturbs stellar orbits in the galactic central region of the host galaxy where the loss cone depletion is already caused by the SMBH binary. The disturbed stars are supplied into the loss cone. Stars of the dwarf galaxy are also supplied into the loss cone. The gravitational interactions between the SMBH binary and these stars become very effective. The gravitational interaction decreases the binding energy of the SMBH binary effectively. As a result, the shrink of the separation of the SMBH binary is accelerated. Our numerical results strongly suggest that the minor mergers are one of the important processes to reduce the coalescence time of the SMBH binary much less than the Hubble time.
6 pages, 16 figures. accepted for publication in PASJ
References in corpus (7)
- Efficient Merger of Binary Supermassive Black Holes in Non-Axisymmetric Galaxies
- Supermassive black hole binaries in gaseous and stellar circumnuclear discs: orbital dynamics and gas accretion
- Massive perturber-driven interactions of stars with a massive black hole
- A new mechanism for massive binary black hole evolution
- Massive perturbers and the efficient merger of binary massive black holes
- Hubble Space Telescope Images of Red Mergers: How Dry are They?
- Missing Dwarf Problem in Galaxy Clusters