The nuclear cluster of the Milky Way: our primary testbed for the interaction of a dense star cluster with a massive black hole
Abstract
This article intends to provide a concise overview, from an observational point-of-view, of the current state of our knowledge of the most relevant properties of the Milky Wayʼs nuclear star cluster (MWNSC). The MWNSC appears to be a typical specimen of nuclear star clusters, which are found at the centers of the majority of all types of galaxies. Nuclear clusters represent the densest and most massive stellar systems in the present-day Universe and frequently coexist with central massive black holes. They are therefore of prime interest for studying stellar dynamics, and the MWNSC is the only one that allows us to obtain data on milli-parsec scales. After discussing the main observational constraints, we start with a description of the overall structure and kinematics of the MWNSC, then focus on a comparison to extragalactic systems, summarize the properties of the young, massive stars in the immediate environment of the Milky Wayʼs central black hole, Sagittarius A*, and finally focus on the dynamics of stars orbiting the black hole at distances of a few to a few tens of milli parsecs.
- Publication:
-
Classical and Quantum Gravity
- Pub Date:
- December 2014
- DOI:
- 10.1088/0264-9381/31/24/244007
- arXiv:
- arXiv:1411.4504
- Bibcode:
- 2014CQGra..31x4007S
- Keywords:
-
- Milky Way: center;
- nuclear star clusters;
- massive black holes;
- star clusters;
- observations: high angular resolution;
- observations: infrared;
- 95;
- 98;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- accepted for publication in Classical and Quantum Gravity as a Special Issue Article