A connection between radio state changing and glitch activity in PSR J0742-2822

TL;DR

This study investigates the link between emission state switching and glitch activity in PSR J0742-2822, revealing a correlation post-glitch that suggests magnetospheric and interior interactions influence pulsar behavior.

Contribution

It provides detailed polarisation profiles and demonstrates a temporal correlation between emission states and glitches, highlighting a potential magnetosphere-internal neutron star connection.

Findings

No correlation observed before the glitch

Strong correlation observed after the glitch

Emission state switching may be driven by magnetosphere-interior interactions

Abstract

PSR J0742-2822 exhibits two distinct emission states that are identified by discrete changes in the observed pulse profile. These changes have previously been shown to correlate with changes in the derivative of the pulse frequency. In this paper, we use observations with the Parkes radio telescope at a centre frequency of 1369 and 3100 MHz to produce high phase resolution polarisation profiles for the two modes and perform a detailed study of the correlation between observed pulse shape and spin-down rate. We find no correlation for at least 200 days prior to a glitch in the pulsar at MJD 55022, following which the correlation becomes strong. This suggests a link between the emission state switching phenomenon and glitch events. We discuss the possibility that emission state switching is driven by the interaction between the magnetosphere and the interior of the neutron star.