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 …

▪ Abstract Black holes of stellar mass and neutron stars in binary systems are first detected
as hard X-ray sources using high-energy space telescopes. Relativistic jets in some of these …

We describe global, 3D, time‐dependent, non‐radiative, general‐relativistic,
magnetohydrodynamic simulations of accreting black holes (BHs). The simulations are …

Black hole (BH) accretion flows and jets are qualitatively affected by the presence of ordered
magnetic fields. We study fully 3D global general relativistic magnetohydrodynamic (MHD) …

We present a unified semiquantitative model for the disc–jet coupling in black hole X-ray
binary systems. In the process we have compiled observational aspects from the existing …

We examine the disc—jet connection in stellar mass and supermassive black holes by
investigating the properties of their compact emission in the X-ray and radio bands. We …

We studied all blazars of known redshift detected by the Fermi satellite during its first 3-
month survey. For the majority of them, pointed Swift observations ensure a good …

Radio loud active galactic nuclei (AGNs) are on average 1000 times brighter in the radio
band compared to radio quiet AGNs. We investigate whether this radio loud/quiet dichotomy …

We continue our study of the possible production of supernovae and a variety of high-energy
transients by black hole formation in massive stars endowed with rotation: the" collapsar …

The formation and large-scale propagation of Poynting-dominated jets produced by
accreting, rapidly rotating black hole systems are studied by numerically integrating the …