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Title: TEMPORAL EVOLUTION OF THE VELA PULSAR’S PULSE PROFILE

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 undertaken an intensive observing campaign of Vela and collected over 6000 hr 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.
Authors:
; ; ;  [1] ;  [2]
  1. Department of Physical Sciences, University of Tasmania, Private Bag 37, Hobart, Tasmania 7001 (Australia)
  2. CSIRO Astronomy and Space Science, 26 Dick Perry Avenue, Technology Park, Kensington WA 6151 (Australia)
Publication Date:
OSTI Identifier:
22518568
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 820; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABUNDANCE; EMISSION; JETS; PERIODICITY; PRECESSION; PULSARS; PULSES; ROTATION; STAR EVOLUTION; X RADIATION