The Galactic Center Massive Black Hole and Nuclear Star Cluster
Reinhard Genzel, Frank Eisenhauer, Stefan Gillessen

TL;DR
This review discusses the evidence for a supermassive black hole at the Galactic Center, the surrounding dense star cluster, recent star formation near Sgr A*, and the accretion processes, highlighting recent observational and theoretical advances.
Contribution
It synthesizes recent observational and theoretical findings on the Galactic Center's black hole and nuclear star cluster, emphasizing new evidence and unresolved paradoxes.
Findings
Evidence confirms a ~4.4 million solar mass black hole at Sgr A*
Recent star formation near the black hole with a top-heavy stellar mass function
Detection of the 'S-star cluster' with stars on close orbits around Sgr A*
Abstract
The Galactic Center is an excellent laboratory for studying phenomena and physical processes that may be occurring in many other galactic nuclei. The Center of our Milky Way is by far the closest galactic nucleus, and observations with exquisite resolution and sensitivity cover 18 orders of magnitude in energy of electromagnetic radiation. Theoretical simulations have become increasingly more powerful in explaining these measurements. This review summarizes the recent progress in observational and theoretical work on the central parsec, with a strong emphasis on the current empirical evidence for a central massive black hole and on the processes in the surrounding dense nuclear star cluster. We present the current evidence, from the analysis of the orbits of more than two dozen stars and from the measurements of the size and motion of the central compact radio source, Sgr A*, that this…
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