Open AccessThe possible role of r‐modes in post‐glitch relaxation of the Crab pulsar
Author(s) -
Rezania Vahid,
JahanMiri M.
Publication year - 2000
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.2000.03358.x
Subject(s) - physics , glitch , crab pulsar , pulsar , astrophysics , vela , neutron star , amplitude , binary pulsar , millisecond pulsar , astronomy , optics , detector
The loss of angular momentum through gravitational radiation, driven by the excitation of r‐modes, is considered for neutron stars that have rotation frequencies lower than the associated critical frequency. We find that for reasonable values of the initial amplitudes of such pulsation modes of the star, being excited at the event of a glitch in a pulsar, the total post‐glitch losses correspond to a negligible fraction of the initial rise of the spin frequency in the case of Vela and older pulsars. However, for the Crab pulsar the same effect would result, within a few months, in a decrease in its spin frequency by an amount larger than its glitch‐induced frequency increase. This could provide an explanation for the peculiar behaviour observed in the post‐glitch relaxations of the Crab pulsar.