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Electron Heating in Low Mach Number Perpendicular shocks. II. Dependence on the Pre-Shock Conditions
Xinyi Guo, Lorenzo Sironi, Ramesh Narayan
Recent X-ray observations of merger shocks in galaxy clusters have shown that the post-shock plasma is two-temperature, with the protons being hotter than the electrons. In this wo…
Electron Heating in Low Mach Number Perpendicular shocks. I. Heating Mechanism
Xinyi Guo, Lorenzo Sironi, Ramesh Narayan
Recent X-ray observations of merger shocks in galaxy clusters have shown that the post-shock plasma is two-temperature, with the protons hotter than the electrons. By means of two-…
Electron and proton heating in trans-relativistic magnetic reconnection
Michael E. Rowan, Lorenzo Sironi, Ramesh Narayan
Hot collisionless accretion flows, such as the one in Sgr A at our Galactic center, provide a unique setting for the investigation of magnetic reconnection. Here, protons are…
Numerical simulations of the Cosmic Battery in accretion flows around astrophysical black holes
Ioannis Contopoulos, Antonios Nathanail, Alexander Sadowski +2
We implement the KORAL code to perform two sets of very long general relativistic radiation magnetohydrodynamic simulations of an axisymmetric optically thin magnetized flow around…
Optical and X-ray luminosity of expanding nebulae around ultraluminous X-ray sources
Magdalena Siwek, Aleksander Sadowski, Ramesh Narayan +2
We have performed a set of simulations of expanding, spherically symmetric nebulae inflated by winds from accreting black holes in ultraluminous X-ray sources (ULXs). We implemente…
Evolving Nonthermal Electrons in Simulations of Black Hole Accretion
Andrew Chael, Ramesh Narayan, Aleksander Sadowski
Current simulations of hot accretion flows around black holes assume either a single-temperature gas or, at best, a two-temperature gas with thermal ions and electrons. However, pr…
Kinetic inhibition of MHD-shocks in the vicinity of a parallel magnetic field
Antoine Bret, Asaf Pe'er, Lorenzo Sironi +2
According to magnetohydrodynamics (MHD), the encounter of two collisional magnetized plasmas at high velocity gives rise to shock waves. Investigations conducted so far have found…
Stellar disruption events support the existence of the black hole event horizon
Wenbin Lu, Pawan Kumar, Ramesh Narayan
Many black hole (BH) candidates have been discovered in X-ray binaries and in the nuclei of galaxies. The prediction of Einstein's general relativity is that BHs have an event hori…
Spectra of Black Hole Accretion Models of Ultra-Luminous X-ray Sources
Ramesh Narayan, Aleksander Sadowski, Roberto Soria
We present general relativistic radiation MHD simulations of super-Eddington accretion on a black hole. We consider a range of mass accretion rates, black hole spins, a…