TEMPORAL EVOLUTION of the VELA PULSAR'S PULSE PROFILE

J. L. Palfreyman; J. M. Dickey; S. P. Ellingsen; I. R. Jones; A. W. Hotan

doi:10.3847/0004-637X/820/1/64

TEMPORAL EVOLUTION of the VELA PULSAR'S PULSE PROFILE

J. L. Palfreyman, J. M. Dickey, S. P. Ellingsen, I. R. Jones, A. W. Hotan

International Centre for Radio Astronomy Research (ICRAR)

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

Abstract

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.

Original language	English
Article number	64
Journal	Astrophysical Journal
Volume	820
Issue number	1
DOIs	https://doi.org/10.3847/0004-637X/820/1/64
Publication status	Published - 20 Mar 2016

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T1 - TEMPORAL EVOLUTION of the VELA PULSAR'S PULSE PROFILE

AU - Palfreyman, J. L.

AU - Dickey, J. M.

AU - Ellingsen, S. P.

AU - Jones, I. R.

AU - Hotan, A. W.

PY - 2016/3/20

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AB - 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.

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TEMPORAL EVOLUTION of the VELA PULSAR'S PULSE PROFILE

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