The timing noise of PSR 0823+26, 1706-16, 1749-28, 2021+51 and the anomalous braking indices

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1999-06-11
Baykal, Altan
Alpar, MA
Boynton, PE
Deeter, JE
We have investigated the stability of the pulse frequency second derivatives (ii) of PSR 0823+26, 1706-16, 1749-28 and 2021+51 that show significant quadratic trends in their pulse-frequency histories in order to determine whether the observed second derivatives are secular or if they arise as part: of noise processes. We have used time-of-arrival (TOA) data extending to more than three decades, which are the longest time-spans ever taken into account in pulse-timing analyses. We investigated the stability of the pulse-frequency second derivative in the framework of low-resolution noise power spectra estimated from the residuals of pulse frequency and TOA data. We have found that the v; terms of these sources arise from the red torque noise in the fluctuations of pulse-frequency derivatives, which may originate from the external torques from the magnetosphere of the pulsar.

Citation Formats
A. Baykal, M. Alpar, P. Boynton, and J. Deeter, “The timing noise of PSR 0823+26, 1706-16, 1749-28, 2021+51 and the anomalous braking indices,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol. 306, no. 1, pp. 207–212, 1999, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/47237.