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Constraints on the Engines of Fast Radio Bursts
Ben Margalit, Brian D. Metzger, Lorenzo Sironi
We model the sample of fast radio bursts (FRB), including the newly discovered CHIME repeaters, using the synchrotron blast wave model of Metzger, Margalit & Sironi (2019). This mo…
The interplay of magnetically-dominated turbulence and magnetic reconnection in producing nonthermal particles
Luca Comisso, Lorenzo Sironi
Magnetized turbulence and magnetic reconnection are often invoked to explain the nonthermal emission observed from a wide variety of astrophysical sources. By means of fully-kineti…
Two years of non-thermal emission from the binary neutron star merger GW170817: rapid fading of the jet afterglow and first constraints on the kilonova fastest ejecta
A. Hajela, R. Margutti, K. D. Alexander +27
We present Chandra and VLA observations of GW170817 at ~521-743 days post merger, and a homogeneous analysis of the entire Chandra data set. We find that the late-time non-thermal…
The Optical Afterglow of GW170817: An Off-axis Structured Jet and Deep Constraints on a Globular Cluster Origin
Wen-fai Fong, P. K. Blanchard, K. D. Alexander +25
We present a revised and complete optical afterglow light curve of the binary neutron star merger GW170817, enabled by deep Hubble Space Telescope (HST) F606W observations at $\app…
The Mechanism of Electron Injection and Acceleration in Trans-Relativistic Reconnection
David Ball, Lorenzo Sironi, Feryal Özel
Electron acceleration during magnetic reconnection is thought to play a key role in time-variable high-energy emission from astrophysical systems. By means of particle-in-cell simu…
Kinetic Simulations of Radiative Magnetic Reconnection in the Coronae of Accreting Black Holes
Lorenzo Sironi, Andrei M. Beloborodov
We perform two- and three-dimensional particle-in-cell simulations of reconnection in magnetically-dominated pair plasmas subject to strong Compton cooling. Reconnection under such…