Zobrazeno 1 - 10
of 61
pro vyhledávání: '"Luca Comisso"'
Publikováno v:
The Astrophysical Journal Letters, Vol 977, Iss 1, p L18 (2024)
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 magne
Externí odkaz:
https://doaj.org/article/1f1b36e7f4924595b3eefeb10bbe9e61
Publikováno v:
The Astrophysical Journal Letters, Vol 961, Iss 1, p L14 (2024)
The recent discovery of astrophysical neutrinos from the Seyfert galaxy NGC 1068 suggests the presence of nonthermal protons within a compact “coronal” region close to the central black hole. The acceleration mechanism of these nonthermal protons
Externí odkaz:
https://doaj.org/article/1f2bd23d4eea4b4c991d01e62457298d
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 75 (2024)
The cores of active galactic nuclei 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 1068
Externí odkaz:
https://doaj.org/article/5ad128f2c43c471696a0ea2b1f04d328
Autor:
Luca Comisso
Publikováno v:
The Astrophysical Journal, Vol 972, Iss 1, p 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:
https://doaj.org/article/1e5d3714fc3648919ddca77241af39e5
Publikováno v:
The Astrophysical Journal, Vol 964, Iss 1, p 14 (2024)
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 particle acceleration wi
Externí odkaz:
https://doaj.org/article/ce81dd3d9ade4b4196080a5aaa26249f
Publikováno v:
The Astrophysical Journal Letters, Vol 946, Iss 2, p L51 (2023)
Gamma-ray flares from active galactic nuclei (AGNs) 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 by-product of the
Externí odkaz:
https://doaj.org/article/22ab17558ba24774bcc787c2e78a2b24
Autor:
Luca Comisso, Brian Jiang
Publikováno v:
The Astrophysical Journal, Vol 959, Iss 2, p 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:
https://doaj.org/article/40d9c5adb9f443659563e6e3bf183dec
Autor:
Chuanfei Dong, Liang Wang, Yi-Min Huang, Luca Comisso, Timothy A. Sandstrom, Amitava Bhattacharjee
Publikováno v:
Science Advances. 8
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:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a8cf8de131ea736949ca207d2f6aa90
https://doi.org/10.1126/sciadv.abn7627
https://doi.org/10.1126/sciadv.abn7627
The plasmoid formation in collisionless plasmas, where magnetic reconnection within turbulence may take place driven by the electron inertia, is analyzed. We find a complex situation in which, due to the presence of strong velocity shears, the typica
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e27143f3078b1246aee46e52c5b9b3fc
http://hdl.handle.net/11583/2963661
http://hdl.handle.net/11583/2963661
Autor:
Virginia Bresci, Luca Comisso, Camilia Demidem, Martin Lemoine, Lorenzo Sironi, Laurent Gremillet
Publikováno v:
Phys.Rev.D
Phys.Rev.D, 2022, 106 (2), pp.023028. ⟨10.1103/PhysRevD.106.023028⟩
Phys.Rev.D, 2022, 106 (2), pp.023028. ⟨10.1103/PhysRevD.106.023028⟩
International audience; Collisionless, magnetized turbulence offers a promising framework for the generation of nonthermal high-energy particles in various astrophysical sites. Yet, the detailed mechanism that governs particle acceleration has remain
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::03ef2459d7fe95d9998b67a96316922c