Glitch or anti-glitch: a Bayesian view

Hu, Y., Pitkin, M. , Heng, I. S. and Hendry, M. (2014) Glitch or anti-glitch: a Bayesian view. Astrophysical Journal Letters, 784(2), L41. (doi: 10.1088/2041-8205/784/2/L41)

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The sudden spin-down in the rotation of magnetar 1E 2259+586 observed by Archibald et al. (2013) was a rare event. However this particular event, referred to as an anti-glitch, was followed by another event which Archibald et al. (2013) suggested could either be a conventional glitch or another anti-glitch. Although there is no accompanied radiation activity or pulse profile change, there is decisive evidence for the existence of the second timing event, judging from the timing data. We apply Bayesian Model Selection to quantitatively determine which of these possibilities better explains the observed data. We show that the observed data strongly supports 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 X 10<sup>8</sup> Hz. We discuss the implications of these results for possible physical mechanisms behind this anti-glitch.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Heng, Professor Ik Siong and Hu, Mr Yiming and Hendry, Professor Martin and Pitkin, Dr Matthew
Authors: Hu, Y., Pitkin, M., Heng, I. S., and Hendry, M.
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Centre:College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
Journal Name:Astrophysical Journal Letters
Publisher:Institute of Physics
ISSN (Online):2041-8213
Copyright Holders:Copyright © 2014 Institute of Physics
First Published:First published in Astrophysical Journal Letters 784(2):L41
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher.

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