We present new astrometric and polarimetric observations of flares from Sgr A* obtained
with GRAVITY, the near-infrared interferometer at ESO's Very Large Telescope …

Context. Low-luminosity supermassive and stellar-mass black holes (BHs) may be
embedded in a collisionless and highly magnetized plasma. They show nonthermal flares …

Context. Observations of Sagittarius A*(Sgr A*) in the near-infrared (NIR) show irregular
flaring activity. Flares coincide with the astrometric rotation of the brightness centroid and …

Magnetic reconnection occurs ubiquitously in the universe and is often invoked to explain
fast energy release and particle acceleration in high-energy astrophysics. The study of …

Quasi-periodic eruptions (QPEs) are an extreme X-ray variability phenomenon associated
with low-mass (M BH< 10 7 M⊙) supermassive black holes (SMBHs). First discovered in the …

Through very long baseline interferometry observations of one of the closest low-luminosity
active galactic nuclei, M81*, at multiple frequencies of 8.8, 22, and 44 GHz, a bright discrete …

High-resolution observations with GRAVITY-Very Large Telescope Interferometer (VLTI)
instrument have provided abundant information about the flares in Sgr A*, the supermassive …

Flux ropes erupting from the vicinity of the black hole are thought to be a potential model for
the flares observed in Sgr\, A $^* $. In this study, we examine the radiative properties of flux …

In this paper, we investigate the astrophysical processes of stellar-mass black holes
(sMBHs) embedded in advection-dominated accretion flows (ADAFs) of supermassive black …

Despite advances in our understanding of low-luminosity active galactic nuclei (LLAGNs),
the fundamental details about the mechanisms of radiation and flare/outburst in hot …