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arXiv 1806.06221astro-ph.IM
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基于1995- 2010年Parkes观测的脉冲星时标

A Pulsar Time Scale Based on Parkes Observations in 1995--2010

Alexander Rodin, Viktoriya Fedorova

摘要:

高度稳定的毫秒天文台的计时提供了独立验证地球时间尺度的可能性,间隔超过一年。根据1995- 2010年澳大利亚64米帕克斯望远镜获得的脉冲星计时数据,构建了一个脉冲星时间尺度。最佳维纳滤波器被应用于提高集合时间尺度的精度。在整个研究的时间间隔内,时间尺度差异PT $_{ens}$ $-$ TT(BIPM 2011)的运行不超过$0.8 {\pm} 0.4$ $μs$。在15年内,$_{ens}$ $-$ TT(BIPM 2011)的分数不稳定性是${σ_z} = (0.6\pm 1.6){\cdot}10^{-15}$,它对应于引力波背景${Ω_g}h^2 {\sim} 10^{-10}$的能量密度的上限和在频率$2{\cdot}10^{-9}$下引力势${\sim} 10^{-15}$ Hz的变化。

英文摘要:

Timing of highly stable millisecond pulsars provides the possibility of independently verifying terrestrial time scales on intervals longer than a year. An ensemble pulsar time scale is constructed based on pulsar timing data obtained on the 64-m Parkes telescope (Australia) in 1995--2010. Optimal Wiener filters were applied to enhance the accuracy of the ensemble time scale. The run of the time--scale difference PT$_{ens}$ $-$ TT(BIPM2011) does not exceed $0.8 {\pm} 0.4$ $μs$ over the entire studied time interval. The fractional instability of the difference $_{ens}$ $-$ TT(BIPM2011) over 15 years is ${σ_z} = (0.6\pm 1.6){\cdot}10^{-15}$, which corresponds to an upper limit for the energy density of the gravitational--wave background ${Ω_g}h^2 {\sim} 10^{-10}$ and variations in the gravitational potential ${\sim} 10^{-15}$ Hz at the frequency $2{\cdot}10^{-9}$.

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