Radio emission of magnetars driven by the quasi-linear diffusion

TL;DR

This paper explores how quasi-linear diffusion in magnetar magnetospheres can generate radio emissions by affecting particle distributions and inducing synchrotron radiation, potentially explaining observed radio signals.

Contribution

It demonstrates that QLD can feasibly produce radio photons in magnetar magnetospheres, providing a new mechanism for magnetar radio emission.

Findings

QLD can generate unstable cyclotron modes in magnetar magnetospheres.

Particle pitch angles are influenced by QLD, enabling synchrotron radiation.

The mechanism is plausible for three known radio magnetars.

Abstract

In this, paper we study the possibility of generation of electromagnetic waves in the magnetospheres of radio magnetars by means of the quasi-linear diffusion (QLD). Considering the magnetosphere composed of the so-called beam and the plasma components respectively, we argue that the frozen-in condition will inevitably lead to the generation of the unstable cyclotron modes. These modes, via the QLD, will in turn influence the particle distribution function, leading to certain values of the pitch angles, thus to an efficient synchrotron mechanism, producing radio photons. We show that for three known radio magnetars the QLD might be a realistic mechanism for producing photons in the radio band.