Zobrazeno 1 - 10
of 116
pro vyhledávání: '"Comisso, Luca"'
Ultra-High-Energy Cosmic Rays (UHECRs), particles characterized by energies exceeding $10^{18}$ eV, are generally believed to be accelerated electromagnetically in high-energy astrophysical sources. One promising mechanism of UHECR acceleration is ma
Externí odkaz:
http://arxiv.org/abs/2410.05546
Publikováno v:
Astrophys. J. 974, 75 (2024)
The cores of active galactic nuclei (AGN) are potential accelerators of 10-100 TeV cosmic rays, in turn producing high-energy neutrinos. This picture was confirmed by the compelling evidence of a TeV neutrino signal from the nearby active galaxy NGC
Externí odkaz:
http://arxiv.org/abs/2407.01678
Autor:
Comisso, Luca
Publikováno v:
Astrophys. J. 972, 9 (2024)
Particle acceleration and pitch-angle anisotropy resulting from magnetic reconnection are investigated in highly magnetized ion-electron plasmas. By means of fully kinetic particle-in-cell simulations, we demonstrate that magnetic reconnection genera
Externí odkaz:
http://arxiv.org/abs/2405.18227
Publikováno v:
Zachary Davis et al 2024 ApJ 964 14
Kinetic simulations of relativistic turbulence have significantly advanced our understanding of turbulent particle acceleration. Recent progress has highlighted the need for an updated acceleration theory that can account for acceleration within the
Externí odkaz:
http://arxiv.org/abs/2311.08627
Publikováno v:
The Astrophysical Journal Letters, Volume 961, Number 1, January 2024
The recent discovery of astrophysical neutrinos from the Seyfert galaxy NGC 1068 suggests the presence of non-thermal protons within a compact "coronal" region close to the central black hole. The acceleration mechanism of these non-thermal protons r
Externí odkaz:
http://arxiv.org/abs/2310.18254
Autor:
Comisso, Luca, Jiang, Brian
Publikováno v:
Astrophys. J. 959, 137 (2023)
Radiation emitted by nonthermal particles accelerated during relativistic magnetic reconnection is critical for understanding the nonthermal emission in a variety of astrophysical systems, including blazar jets, black hole coronae, pulsars, and magne
Externí odkaz:
http://arxiv.org/abs/2310.17560
Gamma-ray flares from Active Galactic Nuclei (AGN) show substantial variability on ultrafast timescales (i.e. shorter than the light crossing time of the AGN's supermassive black hole). We propose that ultrafast variability is a byproduct of the turb
Externí odkaz:
http://arxiv.org/abs/2303.15854
Autor:
Dong, Chuanfei, Wang, Liang, Huang, Yi-Min, Comisso, Luca, Sandstrom, Timothy A., Bhattacharjee, Amitava
Publikováno v:
Science Advances 8, eabn7627 (2022)
Magnetohydrodynamic turbulence regulates the transfer of energy from large to small scales in many astrophysical systems, including the solar atmosphere. We perform three-dimensional magnetohydrodynamic simulations with unprecedentedly large magnetic
Externí odkaz:
http://arxiv.org/abs/2210.10736
Autor:
Comisso, Luca, Sironi, Lorenzo
Publikováno v:
Astrophys. J. Lett. 936, L27 (2022)
Turbulence is often invoked to explain the origin of nonthermal particles in space and astrophysical plasmas. By means of 3D fully kinetic particle-in-cell simulations, we demonstrate that turbulence in low-$\beta$ plasmas ($\beta$ is the ratio of pl
Externí odkaz:
http://arxiv.org/abs/2209.04475
Autor:
Bresci, Virginia, Lemoine, Martin, Gremillet, Laurent, Comisso, Luca, Sironi, Lorenzo, Demidem, Camilia
Collisionless, magnetized turbulence offers a promising framework for the generation of non-thermal high-energy particles in various astrophysical sites. Yet, the detailed mechanism that governs particle acceleration has remained subject to debate. B
Externí odkaz:
http://arxiv.org/abs/2206.08380