Abstract
We report the detection of a glitch event in the Vela pulsar, which occurred on 12 December 2016, based on the timing data obtained from observations between January 2016 and February 2018 at frequency centered at 2256 MHz using the Kunming 40-m radio telescope. The timing solutions for the pre- and post-glitch are presented. By fitting the glitch model to the timing data, we found that the post-glitch recovery exhibits two terms with exponential decay with the time scales of 1 d and 6 d, respectively. The glitch parameters are determined with \(\Delta \nu _{\mathrm{g}}/\nu =1.431(2)\times 10^{-6}\) and \(\Delta \dot{\nu }_{\mathrm{g}}/\dot{\nu }=73.354\times 10^{-3}\). The value of the coupling parameter is calculated to be ∼0.08, implying that the core superfluid is probably not involved in this event. For the glitches with two or more terms with exponential decay in the Vela pulsar, we show that the exponential decays usually exhibit longer time scales with higher degree of glitch recovery. The post-glitch behavior in the slow-down rate \(|\dot{\nu }|\) is dominated by a linear decrease process. From detection of the variations in the slopes of the spin-down rates after the exponential recoveries of the 2013 and 2016 glitches, we conclude that no persistent shift was involved in the 2016 glitches.
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Acknowledgements
This work was supported by Strategic Priority Research Programme of Chinese Academy of Sciences (XDB23010200), the National Natural Science Foundation of China (U1531243, U1631237, 11573059, 11873080), the National Key R&D Program of China (No. 2017YFA0402602), and Open Fund of Guizhou Provincial Key Laboratory of Radio Astronomy and Data Processing. The Kunming 40-m Telescope is jointly operated and administrated by Yunnan Astronomical Observatory and Center for Astronomical Mega-Science, Chinese Academy of Sciences. The Parkes Test-Bed Facility is part of the Australia Telescope, which is funded by the Commonwealth of Australia for operation as a National Facility managed by the Commonwealth Scientific and Industrial Research Organisation (CSIRO).
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Xu, Y.H., Yuan, J.P., Lee, K.J. et al. The 2016 glitch in the Vela pulsar. Astrophys Space Sci 364, 11 (2019). https://doi.org/10.1007/s10509-019-3499-y
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DOI: https://doi.org/10.1007/s10509-019-3499-y