17 papers
Maximum Energy of Particles Accelerated in Gamma-Ray Burst Afterglow Shocks
Zhao-Feng Wu, SofÃa Guevara-Montoya, Paz Beniamini +3
Particle acceleration in relativistic collisionless shocks remains an open problem in high-energy astrophysics. Particle-in-cell (PIC) simulations predict that electron acceleratio…
The role of three-dimensional effects on ion injection and acceleration in perpendicular shocks
Luca Orusa, Damiano Caprioli, Lorenzo Sironi +1
Understanding the conditions that enable particle acceleration at non-relativistic collisionless shocks is essential to unveil the origin of cosmic rays. We employ 2D and 3D hybrid…
Compression-Driven Kinetic Instabilities in Magnetically Arrested Disks
Vedant Dhruv, Lorenzo Sironi, Jordy Davelaar +1
Event horizon-scale observations of low-luminosity black hole accretion flows favor magnetically arrested disks, characterized by dynamically important magnetic fields ($β\lesssim1…
Neutrino and pair creation in reconnection-powered coronae of accreting black holes
D. Karavola, M. Petropoulou, D. F. G. Fiorillo +2
A ubiquitous feature of accreting black hole systems is their hard X-ray emission which is thought to be produced through Comptonization of soft photons by electrons and positrons…
The effect of inverse Compton losses on particle acceleration in three-dimensional relativistic reconnection
Ian Bowyer, Dimitrios Giannios, Lorenzo Sironi
Relativistic magnetic reconnection is a key mechanism for dissipating magnetic energy and accelerating particles in astrophysics. In the absence of radiative cooling, recent partic…
Reconnection-driven Flares in M87*: Proton-Synchrotron-powered GeV Emission
Hayk Hakobyan, Amir Levinson, Lorenzo Sironi +2
Magnetic reconnection in current layers that form intermittently in radiatively inefficient accretion flows onto black holes is a promising mechanism for particle acceleration and…