Recent years have witnessed dramatic progress in our understanding of how turbulence
arises and transports angular momentum in astrophysical accretion disks. The key …

A number of astronomical systems have been discovered that generate collimated flows of
plasma with velocities close to the speed of light. In all cases, the central object is probably a …

While working on an adaptive mesh refinement (AMR) scheme for divergence-free
magnetohydrodynamics (MHD), Balsara discovered a unique strategy for the reconstruction …

We review recent observational and theoretical results on the relationship between
circumstellar accretion disks and jets in young stellar objects. We then present a theoretical …

We review advances in the theoretical and computational studies of disk winds, jets and
outflows including: the connection between accretion and jets, the launch of jets from …

▪ Abstract Extragalactic jets were discovered and initially studied by radio astronomers in
connection with extended radio sources. At present, the combination of jets and disks is …

Radial substructures in circumstellar discs are now routinely observed by Atacama Large
Millimeter/submillimeter Array. There is also growing evidence that disc winds drive …

The twentieth century has witnessed the transformation of astronomy from celestial
mechanics to astrophysics. While optical telescopes may have presented a peek into the …

Relativistic jets are observed in both active galactic nuclei (AGNs) and``microquasars" in our
Galaxy. It is believed that these relativistic jets are ejected from the vicinity of black holes. To …

We present the results of axisymmetric, time-dependent magnetohydrodynamic simulations
of accretion flows around black holes. The calculations begin from a rotationally supported …