Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983mnras.202..437d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 202, Feb. 1983, p. 437-451.
Astronomy and Astrophysics
Astronomy
35
Braking, Crab Nebula, Electromagnetic Pulses, Pulsars, Pulse Rate, Stellar Rotation, Frequency Shift, Neutron Stars, Random Walk, Spin Dynamics, Stellar Magnetic Fields, Stellar Models
Scientific paper
The available pulse arrival-time data of the Crab pulsar (10.4 yr) is analyzed and it is found that the large glitch of 1975 February has had quite unusual consequences. Previous reports that it was accompanied by a persistent shift in the time derivative of the rotation frequency are confirmed. As a consequence of this change, the pulsar now rotates much slower than it would if the glitch had not occurred. This can be explained by a sudden increase in the external braking torque, which would require changes in the structure and/or contents of the corotating magnetosphere. It is found that the second frequency derivative was also changed at the same time. The post-glitch relaxation of the rotation frequency is also studied, and it is concluded that a significant fraction (Q ranging from 0.59 to 0.77) of the initial frequency-jump decayed with a time constant of about 10 days.
Demiański Marek
Proszynski M.
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