Glitch or Anti-glitch:A Bayesian View

Hu, Y.-M. and Pitkin, M. and Heng, Ik Siong and Hendry, M. A. (2014) Glitch or Anti-glitch:A Bayesian View. Astrophysical Journal Letters, 784 (2). ISSN 2041-8205

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Abstract

The sudden spin-down in the rotation of magnetar 1E 2259+586 observed by Archibald et al. was a rare event. However, that particular event, referred to as an anti-glitch, was followed by another event, which Archibald et al. suggested could either be a conventional glitch or another anti-glitch. Although there is no accompanying radiation activity or pulse profile change, there is decisive evidence of the existence of a second timing event, judging from the timing data. We apply a Bayesian Model Selection to quantitatively determine which of these possibilities better explains the observed data. We show that the observed data strongly support the presence of two successive anti-glitches with a Bayes factor, often called the odds ratio, greater than 40. Furthermore, we show that the second anti-glitch has an associated frequency change Δν of –8.2 × 10–8 Hz. We discuss the implications of these results for possible physical mechanisms behind this anti-glitch.

Item Type:
Journal Article
Journal or Publication Title:
Astrophysical Journal Letters
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3103
Subjects:
ID Code:
135718
Deposited By:
Deposited On:
23 Jul 2019 16:00
Refereed?:
Yes
Published?:
Published
Last Modified:
29 Sep 2020 05:07