▪ Abstract The central half kiloparsec region of our Galaxy harbors a variety of phenomena
unique to the central environment. This review discusses the observed structure and activity …

▪ Abstract The inner few parsecs at the Galactic Center have come under intense scrutiny in
recent years, in part due to the exciting broad-band observations of this region, but also …

We describe new optically thin solutions for rotating accretion flows around black holes and
neutron stars. These solutions are advection dominated, so that most of the viscously …

In recent years, evidence for the existence of an ultracompact concentration of dark mass
associated with the radio source Sagittarius A* in the Galactic center has become very …

We report the results of the first-epoch observation with the ACIS-I instrument on the
Chandra X-Ray Observatory of Sagittarius A*(Sgr A*), the compact radio source associated …

The nuclei of most galaxies are now believed to harbour supermassive black holes. The
motions of stars in the central few light years of our Milky Way Galaxy indicate the presence …

THE radio source at the centre of our Galaxy1, Sagittarius A*(Sgr A*), seems to be a low-
luminosity version of active galactic nuclei—a massive black hole that is accreting gas from …

Sagittarius A*, which is located at the Galactic center, is a puzzling source. It has a mass of
M=(2.5±0.4)× 10 6 M &sun;, which makes it an excellent black hole candidate. Observations …

Although it is widely accepted that most galaxies have supermassive black holes at their
centres,,, concrete proof has proved elusive. Sagittarius A*(Sgr A*), an extremely compact …

The recent Chandra observation of the radio source at the center of our Galaxy, Sgr A*, puts
new constraints on its theoretical models. The spectrum is very soft, and the source is rapidly …