On the angular anisotropy of the distribution function of radiating particles in relativistic jets

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Abstract

The observed power-law spectra of relativistic jets from active galactic nuclei clearly indicate the synchrotron mechanism of radiation by particles that also have a power-law energy spectrum. However, the issue of their angular anisotropy has not received sufficient attention until recently, although the example of the solar wind (where a strongly magnetized wind is also realized) shows the importance of taking this circumstance into account. In this paper, the evolution of the initially isotropic power-law spectrum of radiating particles as they propagate along expanding relativistic jets is investigated. It is shown that for relativistic flows in which the electric field plays a decisive role, the conservation of the first adiabatic invariant does not lead to a decrease in the pitch angles of the radiating particles as they enter the region of weak magnetic fields. This is due to the drift nature of the particle motion.

About the authors

T. I. Khalilov

Moscow Institute of Physics and Technology (National Research University); Theoretical Department of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Email: beskin@lpi.ru
Dolgoprudny, Moscow region, Russia; Moscow, Russia

V. S. Beskin

Theoretical Department of P. N. Lebedev Physical Institute of the Russian Academy of Sciences; Moscow Institute of Physics and Technology (National Research University)

Email: beskin@lpi.ru
Moscow, Russia; Dolgoprudny, Moscow region, Russia

V. I. Pariev

Theoretical Department of P. N. Lebedev Physical Institute of the Russian Academy of Sciences

Author for correspondence.
Email: beskin@lpi.ru
Moscow, Russia

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