# The radio shut-off, glitch, and X-ray burst in 1E 1547.0-5408 interpreted through magnetic reconfiguration

## TL;DR

This paper models a magnetar event where magnetic reconfiguration caused radio shut-off, a glitch, and an X-ray burst, linking magnetic geometry changes to observable phenomena.

## Contribution

It introduces a quasi-static magnetic reconfiguration model explaining the sequence of radio shut-off, glitch, and X-ray burst in a magnetar, integrating crustal and magnetospheric dynamics.

## Key findings

- Magnetic perturbation near polar caps can shut off radio pulsations.
- Magnetospheric pollution can suppress pulsar mechanisms without increasing X-ray flux.
- Magnetic energy redistribution can trigger X-ray bursts and star glitches.

## Abstract

A short X-ray burst was observed from the radio-loud magnetar 1E 1547.0-5408 in 2022 April. Unusually however, the source stopped showing radio pulsations $\gtrsim 3\,$weeks prior to the burst. After recovery, radio timing revealed that the object had also undergone a modest glitch. A model for the overall event is constructed where an initially mild perturbation adjusts the magnetic geometry near the polar caps, leading to shallow fractures. Crustal ejecta or particles leaking from a pair-plasma fireball pollute the magnetospheric gaps, shutting off the pulsar mechanism, but the energy release is not yet large enough to noticeably enhance the X-ray flux. This perturbation gradually ramps, eventuating in a large-scale energy redistribution which fuels the burst. The star's mass quadrupole moment changes in tandem, issuing a glitch. Some quantitative estimates for the magnetic reconfiguration under this interpretation are provided, based on a quasi-static model where the fluid evolves through a sequence of hydromagnetic equilibria.