2.3k citations · 53.2k across the 308 of their papers we have counts for
11 papers · 1 filter
Electron Heating by the Ion Cyclotron Instability in Collisionless Accretion Flows. I. Compression-Driven Instabilities and the Electron Heating Mechanism
Lorenzo Sironi, Ramesh Narayan
In systems accreting well below the Eddington rate, the plasma in the innermost regions of the disk is collisionless and two-temperature, with the ions hotter than the electrons. Y…
Non-Thermal Electron Acceleration in Low Mach Number Collisionless Shocks. II. Firehose-Mediated Fermi Acceleration and its Dependence on Pre-Shock Conditions
Xinyi Guo, Lorenzo Sironi, Ramesh Narayan
Electron acceleration to non-thermal energies is known to occur in low Mach number (M<5) shocks in galaxy clusters and solar flares, but the electron acceleration mechanism remains…
Tidal Disruption and Magnetic Flux Capture: Powering a Jet from a Quiescent Black Hole
Luke Zoltan Kelley, Alexander Tchekhovskoy, Ramesh Narayan
The transient Swift J1644+57 is believed to have been produced by an unlucky star wandering too close to a supermassive black hole (BH) leading to a tidal disruption event. This un…
Event-Horizon-Telescope Evidence for Alignment of the Black Hole in the Center of the Milky Way with the Inner Stellar Disk
Dimitrios Psaltis, Ramesh Narayan, Vincent L. Fish +3
Observations of the black hole in the center of the Milky Way with the Event Horizon Telescope at 1.3 mm have revealed a size of the emitting region that is smaller than the size o…
Imaging an Event Horizon: Mitigation of Scattering Toward Sagittarius A*
Vincent L. Fish, Michael D. Johnson, Ru-Sen Lu +10
The image of the emission surrounding the black hole in the center of the Milky Way is predicted to exhibit the imprint of general relativistic (GR) effects, including the existenc…
Global simulations of axisymmetric radiative black hole accretion disks in general relativity with a sub-grid magnetic dynamo
Aleksander Sadowski, Ramesh Narayan, Alexander Tchekhovskoy +3
We present a sub-grid model that emulates the magnetic dynamo operating in magnetized accretion disks. We have implemented this model in the general relativisic radiation magnetohy…