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Three-Dimensional General Relativistic Radiation Magnetohydrodynamical Simulation of Super-Eddington Accretion, using a new code HARMRAD with M1 Closure
Jonathan C. McKinney, Alexander Tchekhovskoy, Aleksander Sadowski +1
Black hole (BH) accretion flows and jets are dynamic hot relativistic magnetized plasma flows whose radiative opacity can significantly affect flow structure and behavior. We descr…
Transient jet formation and state transitions from large-scale magnetic reconnection in black hole accretion discs
Jason Dexter, Jonathan C. McKinney, Sera Markoff +1
Magnetically arrested accretion discs (MADs), where the magnetic pressure in the inner disc is dynamically important, provide an alternative mechanism for regulating accretion to w…
Numerical simulations of super-critical black hole accretion flows in general relativity
A. Sadowski, R. Narayan, J. C. McKinney +1
A new general relativistic radiation magnetohydrodynamical code KORAL, is described, which employs the M1 scheme to close the radiation moment equations. The code has been successf…
Time evolution of pulsar obliquity angle from 3D simulations of magnetospheres
Alexander Philippov, Alexander Tchekhovskoy, Jason G. Li
The rotational period of isolated pulsars increases over time due to the extraction of angular momentum by electromagnetic torques. These torques also change the obliquity angle $α…
Energy Extraction from Spinning Black Holes via Relativistic Jets
Ramesh Narayan, Jeffrey E. McClintock, Alexander Tchekhovskoy
It has for long been an article of faith among astrophysicists that black hole spin energy is responsible for powering the relativistic jets seen in accreting black holes. Two rece…
Semi-implicit scheme for treating radiation under M1 closure in general relativistic conservative fluid dynamics codes
Aleksander Sadowski, Ramesh Narayan, Alexander Tchekhovskoy +1
A numerical scheme is described for including radiation in multi-dimensional general-relativistic conservative fluid dynamics codes. In this method, a covariant form of the M1 clos…
Swift J1644+57 gone MAD: the case for dynamically-important magnetic flux threading the black hole in a jetted tidal disruption event
Alexander Tchekhovskoy, Brian D. Metzger, Dimitrios Giannios +1
The unusual transient Swift J1644+57 likely resulted from a collimated relativistic jet powered by accretion onto a massive black hole (BH) following the tidal disruption (TD) of a…