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Black Hole Spin and the Radio Loud/Quiet Dichotomy of Active Galactic Nuclei
Alexander Tchekhovskoy, Ramesh Narayan, Jonathan C. McKinney
Radio loud active galactic nuclei (AGN) are on average 1000 times brighter in the radio band compared to radio quiet AGN. We investigate whether this radio loud/quiet dichotomy can…
Magnetohydrodynamic Simulations of Gamma-Ray Burst Jets: Beyond the Progenitor Star
Alexander Tchekhovskoy, Ramesh Narayan, Jonathan C. McKinney
Achromatic breaks in afterglow light curves of gamma-ray bursts (GRBs) arise naturally if the product of the jet's Lorentz factor γand opening angle Θ_j satisfies (γΘ_j) >> 1 at th…
Measuring Black Hole Spin via the X-ray Continuum Fitting Method: Beyond the Thermal Dominant State
James F. Steiner, Jeffrey E. McClintock, Ronald A. Remillard +2
All prior work on measuring the spins of stellar-mass black holes via the X-ray continuum-fitting method has relied on the use of weakly-Comptonized spectra obtained in the thermal…
The Event Horizon of Sagittarius A*
Avery E. Broderick, Abraham Loeb, Ramesh Narayan
Black hole event horizons, causally separating the external universe from compact regions of spacetime, are one of the most exotic predictions of General Relativity (GR). Until rec…
Stability of Relativistic Force-Free Jets
Ramesh Narayan, Jason Li, Alexander Tchekhovskoy
We consider a two-parameter family of cylindrical force-free equilibria, modeled to match numerical simulations of relativistic force-free jets. We study the linear stability of th…
Efficiency of Magnetic to Kinetic Energy Conversion in a Monopole Magnetosphere
Alexander Tchekhovskoy, Jonathan C. McKinney, Ramesh Narayan
Unconfined relativistic outflows from rotating, magnetized compact objects are often well-modeled by assuming the field geometry is approximately a split-monopole at large radii. E…