Zobrazeno 1 - 10
of 142
pro vyhledávání: '"Lorenzo Sironi"'
Publikováno v:
Physical Review Research, Vol 6, Iss 4, p 043213 (2024)
We study the propagation of electromagnetic waves in tenuous plasmas, where the wave frequency ω_{0} is much larger than the plasma frequency ω_{P}. We show that in pair plasmas, nonlinear effects are weak for a_{0}≪ω_{0}/ω_{P}, where a_{0} is
Externí odkaz:
https://doaj.org/article/da3989f38fe74d3d944c7e97f280846d
Publikováno v:
The Astrophysical Journal Letters, Vol 963, Iss 2, p L44 (2024)
We study a relativistic collisionless electron–positron shock propagating into an unmagnetized ambient medium using 2D particle-in-cell simulations of unprecedented duration and size. The shock generates intermittent magnetic structures of increasi
Externí odkaz:
https://doaj.org/article/63676f6eaa534c0d8f9386a391a117b4
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
Publikováno v:
The Astrophysical Journal, Vol 974, Iss 1, p 37 (2024)
Collisionless low-Mach-number shocks are abundant in astrophysical and space plasma environments, exhibiting complex wave activity and wave–particle interactions. In this paper, we present 2D Particle-in-Cell (PIC) simulations of quasi-perpendicula
Externí odkaz:
https://doaj.org/article/cf8ed45b90f84ad79dbbd8adbeb6d929
Autor:
Lorenzo Sironi, Aaron Tran
Publikováno v:
The Astrophysical Journal, Vol 968, Iss 2, p 102 (2024)
General relativistic magnetohydrodynamic (GRMHD) simulations of black hole tilted disks—where the angular momentum of the accretion flow at large distances is misaligned with respect to the black hole spin—commonly display standing shocks within
Externí odkaz:
https://doaj.org/article/7785f648f37243cb9ee2b97aaeec8791
Autor:
Aaron Tran, Lorenzo Sironi
Publikováno v:
The Astrophysical Journal, Vol 965, Iss 1, p 37 (2024)
We measure the thermal electron energization in 1D and 2D particle-in-cell simulations of quasi-perpendicular, low-beta ( β _p = 0.25) collisionless ion–electron shocks with mass ratio m _i / m _e = 200, fast Mach number ${{ \mathcal M }}_{\mathrm
Externí odkaz:
https://doaj.org/article/295b135b6e97470bb35fa47a88b2fc9e
Publikováno v:
The Astrophysical Journal Letters, Vol 956, Iss 2, p L36 (2023)
Magnetic reconnection is often invoked as a source of high-energy particles, and in relativistic astrophysical systems it is regarded as a prime candidate for powering fast and bright flares. We present a novel analytical model—supported and benchm
Externí odkaz:
https://doaj.org/article/5e43d8dbe27842f583b4963dc6913111
Publikováno v:
The Astrophysical Journal Letters, Vol 951, Iss 2, p L23 (2023)
We study the linear stability of a planar interface separating two fluids in relative motion, focusing on conditions appropriate for the boundaries of relativistic jets. The jet is magnetically dominated, whereas the ambient wind is gas-pressure-domi
Externí odkaz:
https://doaj.org/article/f4f146655b824ad3bfb2866c82fb97bf
Publikováno v:
The Astrophysical Journal Letters, Vol 943, Iss 2, p L21 (2023)
Nonlinear effects are crucial for the propagation of fast radio bursts (FRBs) near the source. We study the filamentation of FRBs in the relativistic winds of magnetars, which are commonly invoked as the most natural FRB progenitors. As a result of f
Externí odkaz:
https://doaj.org/article/664e41bb921a41a59dc6d513d3248fc5