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7th of May 2019
Mode switching and oscillations in PSR B1828-11
(by Stairs et al.)
The young pulsar PSR B1828−11 was discovered with the 76-m Lovell Telescope at Jodrell Bank Observatory in the late 1980s. With a pulse period is 405 ms, a dispersion measure of ~160 pc/cm^3, and a characteristic age of 110 kyr, it appeared at first glance to be an unremarkable object among the pulsar population. However, routine and eventually more intensive follow-up with the Lovell Telescope showed that it displays roughly periodic variations in its spin-down rate, making it very unsual. In the image above, the black points with error bars show the pulse period derivative (or spin-down rate) for PSR B1828−11. Blue solid lines indicate the observing epochs for the Parkes and Green Bank Telescope data presented in a recent paper by Stairs et al. The red solid line is a fit to the black points incorporating two harmonically related sinusoids of decreasing period as well as a linear slope. The cyan solid line indicates the starting point of data included in the fit. Full results are published in the paper published in Monthly Notices of the Royal Astronomical Society.

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