| A Statistical Analysis of Radio Pulsar Timing Noise |
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| 作者姓名： | A. E. Chukwude |
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| 作者单位： | Department of Physics ＆ Astronomy, University of Nigeria, Nsukka Hartebeesthoek Radio Astronomy Observatory （HartRAO）, P.O. Box 443, Krugersdorp 1740, South Africa |
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| 基金项目： | This work was done, in part, while the author was on a short postdoctoral visit to the Hartebeesthoek Radio Astronomy Observatory (HartRAO) and was completed during his visit to the Abdus Salam ICTP, Trieste, Italy as a Junior Associate. |
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| 摘 要： | We present an analysis of the timing observations on 27 radio pulsars, collected at Hartebeesthoek Radio Astronomy Observatory (HartRAO), with time spans ranging between ～ 9 and 14yr. Our results show that the measured pulsar frequency second derivatives are non-stationary. Both the magnitude and the sign of the ■ values depend upon the choice of epoch and data span. A simple statistical analysis of the observed second time derivative of the pulse frequency (■obs) of a large sample of 391 (25 HartRAO and 366 Jodrell Bank Observatory) pulsars reveals that ■ is only marginally correlated with both the pulsar spin-d own rate ( ■) and the characteristic age (τc). We find correlation coefficients of ～ 0.20a nd-0.30 between the measured braking indices and, respectively, ■ and τc. This result reaffirms earlier conclusions that the braking indices of most radio pulsars, obtained through the standard timing technique, are strongly dominated by sustained random fluctuations in the observed pulse phase.
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| 关 键 词： | methods: statistical — neutron — pulsars: general |
| 修稿时间： | 2006-03-10 |
A Statistical Analysis of Radio Pulsar Timing Noise |
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| A. E. Chukwude.A Statistical Analysis of Radio Pulsar Timing Noise[J].Chinese Journal of Astronomy and Astrophysics,2007,7(4):521-530. |
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| Authors: | A E Chukwude |
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| Abstract: | |
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| Keywords: | methods: statistical - neutron pulsars: general |
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