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Temporal evolution of the Vela pulsar's pulse profile
journal contribution
posted on 2023-05-18, 16:45 authored by Jim PalfreymanJim Palfreyman, John DickeyJohn Dickey, Simon EllingsenSimon Ellingsen, Imogen Jones, Hotan, AWThe 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.
History
Publication title
The Astrophysical JournalVolume
820Article number
64Number
64Pagination
1-5ISSN
0004-637XDepartment/School
School of Natural SciencesPublisher
Univ Chicago PressPlace of publication
1427 E 60Th St, Chicago, USA, Il, 60637-2954Rights statement
Copyright 2016 The American Astronomical SocietyRepository Status
- Open