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

Date

1999-06-11

Author

Baykal, Altan
Alpar, MA
Boynton, PE
Deeter, JE

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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.

Subject Keywords

Stars : neutron, Pulsars : general, Pulsars : individual : PSR 0823+26, Pulsars : individual : PSR 1706-16, Pulsars : individual : PSR 1749-28, Pulsars : individual : PSR 2021+51

URI

https://hdl.handle.net/11511/47237

Collections

Department of Physics, Article