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Title:
Postglitch relaxation of the VELA pulsar after its first eight large glitches - A reevaluation with the vortex creep model
Authors:
Alpar, M. A.; Chau, H. F.; Cheng, K. S.; Pines, David
Affiliation:
AA(Middle East Technical Univ., Ankara, Turkey), AB(University of Hong Kong, Hong Kong), AC(University of Hong Kong, Hong Kong), AD(Illinois Univ., Urbana)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 409, no. 1, p. 345-359. (ApJ Homepage)
Publication Date:
05/1993
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Equations Of State, Neutron Stars, Pulsars, Relaxation Time, Vortices, Angular Momentum, Magnetic Signatures, Stellar Models
DOI:
10.1086/172668
Bibliographic Code:
1993ApJ...409..345A

Abstract

In the present reinterpretation of eight of the nine glitches observed from the Vela pulsar, all glitch data sets may be described in terms of the distinct components of short and intermediate time scale exponential relaxation, followed by long-term recovery. The two former components' exponential relaxation is now interpreted as the linear response of vortex creep in those regions of the pinned superfluid in the neutron star crust through which no sudden motion occurred at the time of the glitch. The tendency of glitches to leave permanent spin-up remnants is seen as the result of a discrete internal torque which couples part of the crustal superfluid to the observed crust in glitches.

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