GLITCH OR ANTI-GLITCH: A BAYESIAN VIEW
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{sup –8} Hz. We discuss the implications of these results for possible physical mechanisms behind this anti-glitch.
- OSTI ID:
- 22365921
- Journal Information:
- Astrophysical Journal Letters, Vol. 784, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
Similar Records
The anti-glitch of magnetar 1E 2259+586 in the wind braking scenario
ANTI-GLITCHES WITHIN THE STANDARD SCENARIO OF PULSAR GLITCHES