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The mechanisms of emission and changes in rotation frequency ("glitching") of the Vela pulsar (J0835-4510) are not well understood. Further insight into these mechanisms can be achieved by long-term studies of integrated pulse width, timing residuals, and bright pulse rates. We have under- taken an intensive observing campaign of Vela and collected over 6000 hours of single pulse data. The data shows that the pulse width changes with time, including marked jumps in width after micro- glitches (frequency changes). The abundance of bright pulses also changes after some micro-glitches, but not all. The secular changes in pulse width have three possible cyclic periods, that match with X-ray periodicities of a helical jet that are interpreted as free precession.

Item Type:	Refereed Article
Keywords:	Vela pulsar (J0835-4510), neutron stars, non-thermal radiation mechanisms
Research Division:	Physical Sciences
Research Group:	Astronomical sciences
Research Field:	High energy astrophysics and galactic cosmic rays
Objective Division:	Expanding Knowledge
Objective Group:	Expanding knowledge
Objective Field:	Expanding knowledge in the physical sciences
UTAS Author:	Palfreyman, JL (Dr Jim Palfreyman)
UTAS Author:	Dickey, JM (Professor John Dickey)
UTAS Author:	Ellingsen, SP (Professor Simon Ellingsen)
UTAS Author:	Jones, IR (Ms Imogen Jones)
ID Code:	106434
Year Published:	2016
Web of Science® Times Cited:	16
Deposited By:	Mathematics and Physics
Deposited On:	2016-02-10
Last Modified:	2017-11-03
Downloads:	222 View Download Statistics