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arXiv 0801.2589astro-ph
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PSR J0437-4715的精确计时:精确的脉冲星距离、高脉冲星质量和牛顿引力常量变化的极限

Precision timing of PSR J0437-4715: an accurate pulsar distance, a high pulsar mass and a limit on the variation of Newton's gravitational constant

J. P. W. Verbiest, M. Bailes, W. van Straten, G. B. Hobbs, R. T. Edwards, R. N. Manchester, N. D. R. Bhat, J. M. Sarkissian, B. A. Jacoby, S. R. Kulkarni

摘要:

对毫秒脉冲星PSR J 0437 -4715十年来的高精度计时数据的分析得出了一个独立于模型的运动学距离,该距离基于表观轨道周期导数Pbdot,以1.5%的精度水平(Dk = 157.0 +/- 2.4 pc)确定,使其成为迄今为止公布的最准确的恒星距离估计之一。这一测量结果与先前公布的视差距离估计值之间的差异归因于DE 200太阳系星历中的误差。对Pbdot的精确测量允许限制牛顿引力常量的变化,|Gdot/G| < 23 x 10^{-12}升/年。我们还限制了沿脉冲星视线的任何异常加速度,|a(星期日)/c| < 1.5 x 10^{-18} 1/s,置信度为95%,并得出脉冲星质量,m(psr)= 1.76 +/- 0.20 M,这是迄今为止获得的最高估计值之一。

英文摘要:

Analysis of ten years of high-precision timing data on the millisecond pulsar PSR J0437-4715 has resulted in a model-independent kinematic distance based on an apparent orbital period derivative, Pbdot, determined at the 1.5% level of precision (Dk = 157.0 +/- 2.4 pc), making it one of the most accurate stellar distance estimates published to date. The discrepancy between this measurement and a previously published parallax distance estimate is attributed to errors in the DE200 Solar System ephemerides. The precise measurement of Pbdot allows a limit on the variation of Newton's gravitational constant, |Gdot/G| < 23 x 10^{-12} 1/yr. We also constrain any anomalous acceleration along the line of sight to the pulsar to |a(Sun)/c| < 1.5 x 10^{-18} 1/s at 95% confidence, and derive a pulsar mass, m(psr) = 1.76 +/- 0.20 M, one of the highest estimates so far obtained.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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