TITLE:
Modeling the Black Hole Recoil from the Nucleus of M83
AUTHORS:
Guilherme G. Ferrari, Horacio Dottori, Rubén J. Díaz
KEYWORDS:
Galaxies; Nuclei; Dynamics; Black Holes Interaction; Kick-Off
JOURNAL NAME:
Journal of Modern Physics,
Vol.4 No.7A,
July
12,
2013
ABSTRACT:
GEMINI + GMOS
and Chandra emission-line spectroscopy reveal that the Fanaroff-Riley II
radio-source J133658.3-295105 is a local object
behind the barred-spiral galaxy M83 that is projected onto the galaxy’s disk at
about 60" from the galaxy’s optical nucleus. J133658.3-295105 and its radiolobes are aligned with the
optical nucleus of M83 and two other radio-sources neither of which are
supernova remnants or HII regions. The optical nucleus of M83 is off-centered
by 2.7" (≈60 pc) with regard to the kinematic center. Its mass is within
the range (1 -4) × 106 and the velocity dispersion at its center points to a
non-resolved mass concentration of ≤106 . In this paper
we study the circumstances in which the radio source would have been ejected
from the central region of M83. We analyze different types of collisions of
binary and triple systems of super-massive black holes (SMBHs) by numerical
simulations using a Post-Newtonian approximation of order 7/2 (~1/c7).
We developed an N-body code specially built to numerically integrate the Post-Newtonian
equations of motion with a symplectic method. Numerical experiments show that the
code is robust enough to handle virtually any mass ratio between particles and
to follow the interaction up to a SMBH separation of three Schwarzschild radii.
We show that within the current Post-Newtonian approximation, a scenario in
which one of the three SMBHs suffers a slingshot-like kick is best suited to
explain the ejection of J133658.3-295105,
which simultaneously produces the recoil of the remaining BH pair, which drags
together a subset of stars from the original cluster forming a structure that
mimics the off-center optical nucleus of M83. The simulation parameters are
tuned to reproduce the velocities and positions of J133658.3-295105 as well as the optical nucleus and the
putative SMBH at its center.