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

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Baykal A., Alpar M., Boynton P., Deeter J.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol.306, no.1, pp.207-212, 1999 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 306 Issue: 1
  • Publication Date: 1999
  • Doi Number: 10.1046/j.1365-8711.1999.02505.x
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.207-212


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.