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 …

The nearby radio galaxy M87 offers a unique opportunity to explore the connections
between the central supermassive black hole and relativistic jets. Previous studies of the …

We investigate radiatively inefficient accretion flow models for Sgr A*, the supermassive
black hole in our Galactic center, in light of new observational constraints. Confirmation of …

We analyze deep near-IR adaptive optics imaging (taken with NAOS/CONICA on the Very
Large Telescope at the European Southern Observatory, Chile), as well as new proper …

With 10 years of high-resolution imaging data now available on the stellar cluster in the
Galactic center, we present proper motions for more than 40 stars at projected distances≤ 1 …

We present the first systematic analysis of the X-ray variability of Sgr A* during the Chandra
X-ray Observatory's 2012 Sgr A* X-ray Visionary Project. With 38 High Energy Transmission …

We report the detection of a variable point source, imaged at L′(3.8 μ m) with the Keck II 10
m telescope's adaptive optics system, that is coincident to within 18 mas (1 σ) of the Galaxy's …

We report the high S/N observation on October 3, 2002 with XMM-Newton of the brightest X-
ray flare detected so far from Sgr A* with a duration shorter than one hour (~ 2.7 ks). The …

Starting in 2012, we began an unprecedented observational program focused on the
supermassive black hole in the center of our Galaxy, Sgr A*, utilizing the High Energy …

We report a possible detection of TeV gamma rays from the Galactic center by the Whipple
10 m gamma-ray telescope. Twenty-six hours of data were taken over an extended period …