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Modeling the evolution and distribution of the frequency’s second derivative and the braking index of pulsar spin
Xie Yi1; Zhang Shuangnan1; Liao Jinyuan2
2015
Source PublicationResearch in Astronomy and Astrophysics
ISSN1674-4527
Volume15Issue:7Pages:963
AbstractWe model the evolution of the spin frequency’s second derivative v and the braking index n of radio pulsars with simulations within the phenomenologicalmodel of their surface magnetic field evolution, which contains a long-term power-law decay modulated by short-term oscillations. For the pulsar PSR B0329+54, a model with three oscillation components can reproduce its v variation. We show that the “averaged” n is different from the instantaneous n, and its oscillation magnitude decreases abruptly as the time span increases, due to the “averaging” effect. The simulated timing residuals agree with the main features of the reported data. Our model predicts that the averaged v of PSR B0329+54 will start to decrease rapidly with newer data beyond those used in Hobbs et al.We further performMonte Carlo simulations for the distribution of the reported data in |v| and |n| versus characteristic age τc diagrams. It is found that the magnetic field oscillation model with decay index α= 0 can reproduce the distributions quite well. Compared with magnetic field decay due to the ambipolar diffusion (α = 0.5) and the Hall cascade (α = 1.0), the model with no long term decay (α = 0) is clearly preferred for old pulsars by the p-values of the two-dimensional Kolmogorov-Smirnov test.
Language英语
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/39583
Collection中国科学院国家天文台
Affiliation1.中国科学院国家天文台
2.中国科学院大学
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Xie Yi,Zhang Shuangnan,Liao Jinyuan. Modeling the evolution and distribution of the frequency’s second derivative and the braking index of pulsar spin[J]. Research in Astronomy and Astrophysics,2015,15(7):963.
APA Xie Yi,Zhang Shuangnan,&Liao Jinyuan.(2015).Modeling the evolution and distribution of the frequency’s second derivative and the braking index of pulsar spin.Research in Astronomy and Astrophysics,15(7),963.
MLA Xie Yi,et al."Modeling the evolution and distribution of the frequency’s second derivative and the braking index of pulsar spin".Research in Astronomy and Astrophysics 15.7(2015):963.
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