Characterization of the Crab Pulsar's Timing Noise

Abstract

We present a power spectral analysis of the Crab pulsar's timing noise, mainly using radio measurements from Jodrell Bank taken over the period 1982-1989. The power spectral analysis is complicated by nonuniform data sampling and the presence of a steep red power spectrum that can distort power spectra measurement by causing severe power ``leakage''. We develop a simple windowing method for computing red noise power spectra of uniformly sampled data sets and test it on Monte Carlo generated sample realizations of red power-law noise. We generalize time-domain methods of generating power-law red noise with even integer spectral indices to the case of noninteger spectral indices. The Jodrell Bank pulse phase residuals are dense and smooth enough that an interpolation onto a uniform time series is possible. A windowed power spectrum is computed revealing a periodic or nearly periodic component with a period of about 568 days and a 1/f^3 power-law noise component with a noise strength of 1.24 +/- 0.067 10^{-16} cycles^2/sec^2 over the analysis frequency range 0.003 - 0.1 cycles/day. This result deviates from past analyses which characterized the pulse phase timing residuals as either 1/f^4 power-law noise or a quasiperiodic process. The analysis was checked using the Deeter polynomial method of power spectrum estimation that was developed for the case of nonuniform sampling, but has lower spectral resolution. The timing noise is consistent with a torque noise spectrum rising with analysis frequency as f implying blue torque noise, a result not predicted by current models of pulsar timing noise. If the periodic or nearly periodic component is due to a binary companion, we find a companion mass > 3.2 Earth masses.

arXiv comment53 pages, 9 figures, submitted to MNRAS, abstract condensed

References in corpus (6)

• Observations of Accreting Pulsars
• Discovery of Spatial and Spectral Structure in the X-Ray Emission from the Crab Nebula
• On Young Neutron Stars as Propellers and Accretors with Conventional Magnetic Fields
• Magnetar-like X-ray Bursts from an Anomalous X-ray Pulsar
• An Optical Counterpart to the Anomalous X-ray Pulsar 4U 0142+61
• The detection of variability from the candidate IR counterpart to the Anomalous X-ray Pulsar 1E1048.1-5937

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