Knot in Cen A: Stochastic Magnetic Field for Diffusive Synchrotron Radiation?

Abstract

The emission of relativistic electrons moving in the random and small-scale magnetic field is presented by diffusive synchrotron radiation (DSR). In this Letter, we revisit the perturbative treatment of DSR. We propose that random and small-scale magnetic field might be generated by the turbulence. As an example, multi-band radiation of the knot in Cen A comes from the electrons with energy ${\gamma }_e\sim 10^3-10^4$ in the magnetic field of $10^{-3}G$. The multi-band spectrum of DSR is well determined by the feature of stochastic magnetic field. These results put strong constraint to the models of particle acceleration.

accepted by ApJL, comments are welcome

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• On Particle Transport and Radiation Production in Sub-Larmor-Scale Electromagnetic Turbulence
• Gamma Rays from Centaurus A
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• Jitter Self-Compton Process: GeV Emission of GRB 100728A
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