On the mechanism of the pulsed high energy emission from the pulsar PSR B1509-58

TL;DR

This paper explores the mechanism behind the pulsed high-energy emission from pulsar PSR B1509-58, linking it to radio emission and cyclotron instability, and explains the simultaneous emission and absence of a radio counter pulse.

Contribution

It proposes a model where cyclotron instability and quasi-linear diffusion produce high-energy pulses coinciding with radio pulses in the pulsar magnetosphere.

Findings

High-energy and radio emissions originate simultaneously in the magnetosphere.

Cyclotron instability excites low-frequency waves that influence particle distributions.

The absence of a radio counter pulse is explained by the emission mechanism.

Abstract

We investigate the high-energy (HE) ($<1$GeV) emission from the pulsar PSR B1509-58 and its relation to the radio emission in the 1.4GHz frequency band. The role of the quasi-linear diffusion in producing the pulsed HE radiation is investigated. We show that by means of the cyclotron instability the relatively low frequency waves excite, which due to the diffusion process influence the particle distribution function and switch on the synchrotron emission mechanism. We argue that the coincidence of HE main peak and the radio pulse is a direct consequence of the fact that the high and low frequency radiation is produced simultaneously in a local area of the pulsar magnetosphere. In the paper we also consider the absence of the radio counter pulse and explain this fact.