Nonlinear interglitch dynamics, the braking index of the Vela pulsar and the time to the next glitch

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dc.contributor.author Akbal, O.
dc.contributor.author Buchner, S.
dc.contributor.author Pines, D.
dc.contributor.author Alpar, M.A.
dc.date.accessioned 2017-11-15T15:19:06Z
dc.date.available 2017-11-15T15:19:06Z
dc.date.issued 2017-08
dc.identifier.citation Akbal, O. et al. 2017. Nonlinear interglitch dynamics, the braking index of the Vela pulsar and the time to the next glitch. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 469(4), pp. 4183-4192. en_ZA
dc.identifier.issn 0035-8711 (Print)
dc.identifier.issn 1365-2966 (Online)
dc.identifier.uri http://hdl.handle.net/10539/23415
dc.description.abstract The interglitch timing of the Vela pulsar is characterized by a constant second derivative of the rotation rate. This takes over after the post-glitch exponential relaxation and is completed at about the time of the next glitch. The vortex creep model explains the second derivatives in terms of nonlinear response to the glitch. We present interglitch timing fits to the present sample covering 16 large glitches, taking into account the possibility that in some glitches part of the step in the spin-down ratemay involve a 'persistent shift', as observed in the Crab pulsar. Modifying the expression for the time between glitches with this hypothesis leads to better agreement with the observed interglitch time intervals. We extrapolate the interglitch model fits to obtain spin-down rates just prior to each glitch and use these to calculate the braking index n = 2.81 +/- 0.12. The next glitch should occur around 2017 December 22, +/- 197 d if no persistent shift is involved, but could occur as early as 2016 July 27, +/- 152 d if the 2013 glitch gave rise to a typical Vela persistent shift. Note added: Literally while we were submitting the first version of this paper on 2016 December 12, we saw ATel # 9847 announcing a Vela pulsar glitch which has arrived 138 d after our prediction with a persistent shift, within the 1 sigma uncertainty of 152 d. en_ZA
dc.language.iso en en_ZA
dc.publisher Oxford University Press (OUP) en_ZA
dc.rights This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. en_ZA
dc.subject Stars: neutron en_ZA
dc.subject Pulsars: general en_ZA
dc.subject Pulsars: individuals: Vela en_ZA
dc.subject Stars: rotation en_ZA
dc.subject Dense matter en_ZA
dc.subject VORTEX CREEP en_ZA
dc.subject INTERNAL TEMPERATURE en_ZA
dc.subject POSTGLITCH RELAXATION en_ZA
dc.subject TIMING PACKAGE en_ZA
dc.subject CRAB PULSAR en_ZA
dc.subject Pulsars: individuals: Vela en_ZA
dc.subject stars: interiors en_ZA
dc.subject Pulsars: general en_ZA
dc.title Nonlinear interglitch dynamics, the braking index of the Vela pulsar and the time to the next glitch en_ZA
dc.type Article en_ZA
dc.journal.volume 469 en_ZA
dc.journal.title MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY en_ZA
dc.description.librarian EM2017 en_ZA
dc.citation.doi 10.1093/mnras/stx1095 en_ZA
dc.citation.epage 4192 en_ZA
dc.citation.issue 4 en_ZA
dc.citation.spage 4183 en_ZA


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