Statistical Study of Neutron Star Glitches
International Journal of Astrophysics and Space Science
Volume 2, Issue 2, April 2014, Pages: 16-21
Received: Apr. 11, 2014; Accepted: May 4, 2014; Published: May 20, 2014
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Authors
Eya, Innocent Okwudili, Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria
Urama, Johnson O., Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State, Nigeria
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Abstract
Neutron star glitches; spanning a period of 42 years of pulsar timing were studied. These glitches are from Radio, X-ray, Anomalous X-ray and Milliseconds Pulsars. Radio Pulsars dominates the glitch events, contributing 87% of the glitches. Pulsars of characteristic age bracket 103 to 105 yrs dominated the glitch events, at a rate of 5.2 glitches per year per pulsar. Pulsar of the above age bracket exhibits large size glitches compared to others. A large frequency spin-up (△v) is generally associated with large frequency derivative jump (△v ̇). The distribution of the glitch magnitude (△v/v) is bimodal reaffirming dual glitch mechanism, but that of spin-up (△v) is tending towards multi-modal. Moreover, glitches in Vela pulsar and PSR J0537-6910 showed strong elasticity of the objects, suggesting that the interiors of these objects are in thermal equilibrium. Glitches from PSR J1740-3015 and PSR J1341-6220 appeared to occur in groups, suggesting that their interior fluid is switching between two phases. We discussed the glitch activity of young pulsars in terms of vortex creep model.
Keywords
Star, Neutron, Pulsar, Glitch, General
To cite this article
Eya, Innocent Okwudili, Urama, Johnson O., Statistical Study of Neutron Star Glitches, International Journal of Astrophysics and Space Science. Vol. 2, No. 2, 2014, pp. 16-21. doi: 10.11648/j.ijass.20140202.11
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