The general theory of relativity predicts that a star passing close to a supermassive black
hole should exhibit a relativistic redshift. In this study, we used observations of the Galactic …

We present new, more precise measurements of the mass and distance of our Galaxy's
central supermassive black hole, Sgr A*. These results stem from a new analysis that more …

We demonstrate that short-period stars orbiting around the supermassive black hole in our
Galactic center can successfully be used to probe the gravitational theory in a strong regime …

Context. The environment of Sagittarius A*(Sgr A*), the central black hole of the Milky Way,
is the only place in the Universe where we can currently study the interaction between a …

We describe and report first results from PALM-3000, the second-generation astronomical
adaptive optics (AO) facility for the 5.1 m Hale telescope at Palomar Observatory. PALM …

We present new kinematic measurements and modeling of a sample of 116 young stars in
the central parsec of the Galaxy in order to investigate the properties of the young stellar …

Searching for space-time variations of the constants of Nature is a promising way to search
for new physics beyond general relativity and the standard model motivated by unification …

Context. Within the central 10 pc of our Galaxy lies a dense cluster of stars. This nuclear star
cluster forms a distinct component of the Galaxy, and similar nuclear star clusters are found …

Context. The existence of dynamically relaxed stellar density cusps in dense clusters around
massive black holes is a long-standing prediction of stellar dynamics, but it has so far …

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 …