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Author Eya, I. O. ♦ Urama, J. O. ♦ Chukwude, A. E.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ANGULAR MOMENTUM TRANSFER ♦ COMPUTERIZED SIMULATION ♦ CORRELATIONS ♦ DISTRIBUTION ♦ MOMENT OF INERTIA ♦ NEUTRON STARS ♦ PULSARS ♦ SPIN
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.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2017-05-01
Publisher Place United States
Journal Astrophysical Journal
Volume Number 840
Issue Number 1


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