The hierarchical triple-body approximation has useful applications to a variety of systems
from planetary and stellar scales to supermassive black holes. In this approximation, the …

General relativity has been widely tested in weak gravitational fields but still stands largely
untested in the strong-field regime. According to the no-hair theorem, black holes in general …

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 …

Most, if not all, stars in the field are born in binary configurations or higher multiplicity
systems. In dense stellar environment such as the Galactic Center (GC), many stars are …

The close neighborhood of a supermassive black hole contains not only the accreting gas
and dust but also stellar-sized objects, such as late-type and early-type stars and compact …

The motion data of the S-stars around the Galactic Centre gathered in the last 28 yr imply
that Sgr A* hosts a supermassive compact object of about, a result awarded with the Nobel …

The Galactic center is dominated by the gravity of a super-massive black hole (SMBH),
Sagittarius A*, and is suspected to contain a sizable population of binary stars. Such …

Like most galaxies, the Milky Way harbors a supermassive black hole (SMBH) at its center,
surrounded by a nuclear star cluster. In this dense star cluster, direct collisions can occur …

The electromagnetic counterpart to the Galactic center supermassive black hole, Sgr A*, has
been observed in the near-infrared for over 20 yr and is known to be highly variable. We …

We report new observations with the Very Large Array, Atacama Large Millimeter Array, and
Submillimeter Array at frequencies from 1.0 to 355 GHz of the Galactic Center black hole …