On the radiation-loud and radiation-quiet anti-glitches in magnetar 1E 2259+586

TL;DR

This paper analyzes different types of anti-glitches in magnetar 1E 2259+586, highlighting their characteristics, possible correlations with luminosity and activity, and providing a general understanding of magnetar anti-glitches.

Contribution

It introduces parameters to quantitatively characterize anti-glitch behavior and offers a comprehensive picture of anti-glitches in magnetars, including radiation-loud and quiet types.

Findings

High X-ray luminosity magnetars are more prone to anti-glitches.

Anti-glitchers and radio-emitters occupy opposite regions in luminosity vs. energy loss diagram.

The 2019 radiation-quiet anti-glitch is less constraining due to smaller amplitude.

Abstract

The radiation-loud and radiation-quiet anti-glitches in magnetar 1E 2259+586 are discussed together. It is shown that the 2019 radiation-quiet anti-glitch in 1E 2259+586 is not constraining, because its amplitude is 2.5 smaller than the previous radiation-loud anti-glitch. We note that magnetars with high X-ray luminosity and low rotational energy loss rate are more likely to show anti-glitches. Anti-glitchers and radio-emitters of magnetars occupy opposite corner on the luminosity vs. rotational energy loss rate diagram. By introducing the X-ray luminosity parameter and the activity parameter, we try to characterize this trend quantitatively. A general picture of magnetar anti-glitch is given.