Klein-Nishina effects in the spectra of non-thermal sources immersed in external radiation fields [PDF]
Monthly Notices of the Royal Astronomical Society, 2005 We study Klein-Nishina (KN) effects in the spectrum produced by a steady state, non-thermal source where rapidly accelerated electrons cool by emitting synchrotron radiation and Compton upscattering ambient photons produced outside the source. We focus on the case where the radiation density inside the source exceeds that of the magnetic field. We show
Moderski, R. +3 more
openaire +5 more sources
Particle Injection and Nonthermal Particle Acceleration in Relativistic Magnetic Reconnection
The Astrophysical Journal, 2023 Magnetic reconnection in the relativistic regime has been proposed as an important process for the efficient production of nonthermal particles and high-energy emission. Using fully kinetic particle-in-cell simulations, we investigate how the guide-field
Omar French +3 more
doaj +1 more source
Non-thermal processes in bowshocks of runaway stars. Application to Zeta Oph [PDF]
, 2012 Runaway massive stars are O- and B-type stars with high spatial velocities with respect to the interstellar medium. These stars can produce bowshocks in the surrounding gas.
del Valle, María Victoria +1 more
core +2 more sources
The Ultraviolet C ii Lines as a Diagnostic of κ-distributed Electrons in Planetary Nebulae
The Astrophysical Journal, 2022 Non-Maxwellian κ electron energy distributions (EEDs) have been proposed in recent years to resolve the so-called “electron temperature and abundance discrepancy problem” in the study of planetary nebulae (PNs).
Zheng-Wei Yao, Yong Zhang
doaj +1 more source
The Astrophysical Journal, 2023 Blazar emission is dominated by nonthermal radiation processes that are highly variable across the entire electromagnetic spectrum. Turbulence, which can be a major source of nonthermal particle acceleration, can widely exist in the blazar emission ...
Haocheng Zhang +5 more
doaj +1 more source
Nonthermal Emission from the Arches Cluster (G0.121+0.017) and the Origin of $\gamma$-ray Emission from 3EG J1746-2851 [PDF]
, 2003 High resolution VLA observations of the Arches cluster near the Galactic center show evidence of continuum emission at $\lambda$3.6, 6, 20 and 90cm. The continuum emission at $\lambda$90cm is particularly striking because thermal sources generally become
Anantharamaiah K. R. +9 more
core +2 more sources
Runaway massive stars as variable gamma-ray sources [PDF]
, 2014 Runaway stars are ejected from their formation sites well within molecular cores in giant dark clouds. Eventually, these stars can travel through the molecular clouds, which are highly inhomogeneous.
del Valle, Maria V., Romero, Gustavo E.
core +3 more sources
Evolution of non-thermal emission from shell associated with AGN jets [PDF]
, 2011 We explore the evolution of the emissions by accelerated electrons in shocked shells driven by jets in active galactic nuclei (AGNs). Focusing on powerful sources which host luminous quasars, we evaluated the broadband emission spectra by properly taking
Ito, H. +3 more
core +1 more source
Nuclear Physics Meets the Sources of the Ultra-High Energy Cosmic Rays [PDF]
, 2016 The determination of the injection composition of cosmic ray nuclei within astrophysical sources requires sufficiently accurate descriptions of the source physics and the propagation - apart from controlling astrophysical uncertainties.
Boncioli, Denise +2 more
core +1 more source
A Geometric Model to Interpret the γ-Ray Quasiperiodic Oscillation of PG 1553+113
The Astrophysical Journal, 2023 We propose a jet helical motion model to explain the γ -ray quasiperiodic oscillation of PG 1553+113. In this model, we hypothesize that a relativistic jet with constant angular velocity rotates around the axis, causing the Doppler factor of the jet to ...
Quan-Gui Gao +6 more
doaj +1 more source