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Title: Angular Momentum Transfer and Fractional Moment of Inertia in Pulsar Glitches

Abstract

We use the Jodrell Bank Observatory glitch database containing 472 glitches from 165 pulsars to investigate the angular momentum transfer during rotational glitches in pulsars. Our emphasis is on pulsars with at least five glitches, of which there are 26 that exhibit 261 glitches in total. This paper identifies four pulsars in which the angular momentum transfer, after many glitches, is almost linear with time. The Lilliefore test on the cumulative distribution of glitch spin-up sizes in these glitching pulsars shows that glitch sizes in 12 pulsars are normally distributed, suggesting that their glitches originate from the same momentum reservoir. In addition, the distribution of the fractional moment of inertia (i.e., the ratio of the moment of inertia of neutron star components that are involved in the glitch process) have a single mode, unlike the distribution of fractional glitch size (Δ ν / ν ), which is usually bimodal. The mean fractional moment of inertia in the glitching pulsars we sampled has a very weak correlation with the pulsar spin properties, thereby supporting a neutron star interior mechanism for the glitch phenomenon.

Authors:
; ;  [1]
  1. Department of Physics and Astronomy, University of Nigeria, Nsukka, Enugu State (Nigeria)
Publication Date:
OSTI Identifier:
22663641
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 840; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ANGULAR MOMENTUM TRANSFER; COMPUTERIZED SIMULATION; CORRELATIONS; DISTRIBUTION; MOMENT OF INERTIA; NEUTRON STARS; PULSARS; SPIN

Citation Formats

Eya, I. O., Urama, J. O., and Chukwude, A. E., E-mail: innocent.eya@unn.edu.ng, E-mail: innocent.eya@gmail.com. Angular Momentum Transfer and Fractional Moment of Inertia in Pulsar Glitches. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA6B55.
Eya, I. O., Urama, J. O., & Chukwude, A. E., E-mail: innocent.eya@unn.edu.ng, E-mail: innocent.eya@gmail.com. Angular Momentum Transfer and Fractional Moment of Inertia in Pulsar Glitches. United States. doi:10.3847/1538-4357/AA6B55.
Eya, I. O., Urama, J. O., and Chukwude, A. E., E-mail: innocent.eya@unn.edu.ng, E-mail: innocent.eya@gmail.com. Mon . "Angular Momentum Transfer and Fractional Moment of Inertia in Pulsar Glitches". United States. doi:10.3847/1538-4357/AA6B55.
@article{osti_22663641,
title = {Angular Momentum Transfer and Fractional Moment of Inertia in Pulsar Glitches},
author = {Eya, I. O. and Urama, J. O. and Chukwude, A. E., E-mail: innocent.eya@unn.edu.ng, E-mail: innocent.eya@gmail.com},
abstractNote = {We use the Jodrell Bank Observatory glitch database containing 472 glitches from 165 pulsars to investigate the angular momentum transfer during rotational glitches in pulsars. Our emphasis is on pulsars with at least five glitches, of which there are 26 that exhibit 261 glitches in total. This paper identifies four pulsars in which the angular momentum transfer, after many glitches, is almost linear with time. The Lilliefore test on the cumulative distribution of glitch spin-up sizes in these glitching pulsars shows that glitch sizes in 12 pulsars are normally distributed, suggesting that their glitches originate from the same momentum reservoir. In addition, the distribution of the fractional moment of inertia (i.e., the ratio of the moment of inertia of neutron star components that are involved in the glitch process) have a single mode, unlike the distribution of fractional glitch size (Δ ν / ν ), which is usually bimodal. The mean fractional moment of inertia in the glitching pulsars we sampled has a very weak correlation with the pulsar spin properties, thereby supporting a neutron star interior mechanism for the glitch phenomenon.},
doi = {10.3847/1538-4357/AA6B55},
journal = {Astrophysical Journal},
number = 1,
volume = 840,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}