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 …

Massive black holes (BHs) are at once exotic and yet ubiquitous, residing at the centers of
massive galaxies in the local Universe. Recent years have seen remarkable advances in …

Magnetic reconnection can power bright, rapid flares originating from the inner
magnetosphere of accreting black holes. We conduct extremely high-resolution (5376× …

Several years after its initial identification (Balick & Brown 1974), the radio source at the
center of our Galaxy, now associated with the supermassive black hole Sagittarius A*(Sgr …

Black hole accretion flows can be divided into two broad classes: cold and hot. Whereas
cold accretion flows consist of cool optically thick gas and are found at relatively high mass …

The cores of most galaxies are thought to harbour supermassive black holes, which power
galactic nuclei by converting the gravitational energy of accreting matter into radiation …

Einstein's General theory of relativity (GR) successfully describes gravity. Although GR has
been accurately tested in weak gravitational fields, it remains largely untested in the general …

Abstract The Event Horizon Telescope (EHT) provides the unprecedented ability to directly
resolve the structure and dynamics of black hole emission regions on scales smaller than …

Using flow models based on axisymmetric general relativistic magnetohydrodynamics
simulations, we construct radiative models for Sgr A*. Spectral energy distributions (SEDs) …

Abstract Sagittarius A*(Sgr A*) is the variable radio, near-infrared (NIR), and X-ray source
associated with accretion onto the Galactic center black hole. We have analyzed a …