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Revista mexicana de astronomía y astrofísica

Print version ISSN 0185-1101


EYA, I. O.; URAMA, J. O.  and  CHUKWUDE, A. E.. Entrainment factor of individual glitch fractional moment of inertia. Rev. mex. astron. astrofis [online]. 2019, vol.55, n.1, pp.3-9. ISSN 0185-1101.

The superfluid in the inner crust of a neutron star is assumed to be the reservoir of momentum released in a pulsar glitch. Recently, due to crustal entrainment, it appears debatable whether the magnitude of the inner crust is sufficient to contain the superfluid responsible for large glitches. This paper calculates the fractional moment of inertia (FMI)(i.e. the ratio of the inner crust superfluid moment of inertia to that of the coupled components) associated with individual glitches. It is shown that the effective moment of inertia associated with the transferred momentum is that of the entrained neutrons. The FMI for glitches in three pulsars, which exhibit the signature of exhausting their momentum reservoir, were calculated and scaled with the entrainment factor. Some of the glitches require an inner crust superfluid with moment of inertia larger than the current suggested values of 7-10% of the stellar moment of inertia.

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