Analyzing the stellar kinematics of Holm 15A
A 40-billion solar mass black hole in the extreme core of Holm 15A, the central galaxy of Abell 85
We use orbit-based, axisymmetric, axisymmetric models to analyse the stellar kinematics of the brightest cluster galaxy (bcg) of the galaxy cluster abell 85, the brightest cluster galaxy (bcg) of the cluster, the brightest cluster galaxy (bcg) of the galaxy cluster abell 85, and the faintest depleted core of any early-type galaxy (etg) that has been dynamically modelled in detail.We find that the distribution of stellar orbits is increasingly biased towards tangential motions inside the core.However, the tangential bias is less than in other cored elliptical galaxies.We find a supermassive black hole(smbh) with a mass of (4.0 +- 0.80) x 10^10 solar masses at the center of the galaxy, making it the most massive black hole with a direct dynamical detection in the local universe.We find that black hole masses in cored galaxies scale inversely with the central stellar surface brightness and mass density, respectively.These correlation are independent of a specific parameterization of the light profile.We compare the observed amount of tangential anisotropy and the shape of the light profile with n-body simulations of mergers between galaxies with black holes and find that the observed amount of tangential anisotropy and the shape of the light profile are consistent with a formation scenario where holm 15a is the remnant of a merger between two early-type galaxies with pre-existing depleted cores.
