Diffusive radiation in Langmuir turbulence produced by jet shocks

Abstract

Anisotropic distributions of charged particles including two-stream distributions give rise to generation of either stochastic electric fields (in the form of Langmuir waves, Buneman instability) or random quasi-static magnetic fields (Weibel and filamentation instabilities) or both. These two-stream instabilities are known to play a key role in collisionless shock formation, shock-shock interactions, and shock-induced electromagnetic emission. This paper applies the general non-perturbative stochastic theory of radiation to study electromagnetic emission produced by relativistic particles, which random walk in the stochastic electric fields of the Langmuir waves. This analysis takes into account the cumulative effect of uncorrelated Langmuir waves on the radiating particle trajectory giving rise to angular diffusion of the particle, which eventually modifies the corresponding radiation spectra. We demonstrate that the radiative process considered is probably relevant for emission produced in various kinds of astrophysical jets, in particular, prompt gamma-ray burst spectra, including X-ray excesses and prompt optical flashes.

9 pages, 5 figures, MNRAS, accepted

References in corpus (7)

• Particle Acceleration in Relativistic Jets due to Weibel Instability
• Characterization of the initial filamentation of a relativistic electron beam passing through a plasma
• Particle Acceleration and Magnetic Field Generation in Electron-Positron Relativistic Shocks
• New Chandra observations of the jet in 3C273. I. Softer X-ray than radio spectra and the X-ray emission mechanism
• Diffusive Synchrotron Radiation from Relativistic Shocks of Gamma-Ray Burst Sources
• Diffusive Synchrotron Radiation from Pulsar Wind Nebulae
• Diffusive synchrotron radiation from extragalactic jets

Cited by in corpus (8)

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• Electromagnetic turbulence driven by the mixed mode instability
• Radio Emission by Soliton Formation in Relativistically Hot Streaming Pulsar Pair Plasmas
• GRB spectral parameters within the fireball model
• Magnetic field amplification and electron acceleration to near-energy equipartition with ions by a mildly relativistic quasi-parallel plasma protoshock
• Electromagnetic radiation of charged particles in stochastic motion
• General properties of the radiation spectra from relativistic electrons moving in a Langmuir turbulence
• GRB spectral parameter modeling