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arXiv 0902.4323astro-ph.HE
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吸积毫秒脉冲星XTE J1807-294热点的吸积力矩和运动

Accretion torques and motion of the hot spot on the accreting millisecond pulsar XTE J1807-294

Alessandro Patruno, Jacob M. Hartman, R. Wijnands, Deepto Chakrabarty, Michiel van der Klis

摘要:

本文对2003年吸积毫秒脉冲星XTE J1807 - 294的爆发进行了相干定时分析。我们发现自旋频率导数的上限为5E-14 Hz/s。脉动的正弦分数振幅是在吸积毫秒双星中观察到的最高的,可以达到27%(2.5 - 30 keV)的值。脉冲到达时间残差的基本遵循线性反相关的分数振幅,表明热点运动的表面上的中子星在经度和纬度。残差和X射线通量之间的反相关性表明吸积率对脉冲相位的影响,并对使用标准计时技术测量中子星的自旋频率和扭矩产生怀疑。

英文摘要:

We present a coherent timing analysis of the 2003 outburst of the accreting millisecond pulsar XTE J1807-294. We find an upper limit for the spin frequency derivative of 5E-14 Hz/s. The sinusoidal fractional amplitudes of the pulsations are the highest observed among the accreting millisecond pulsars and can reach values of up to 27% (2.5-30 keV). The pulse arrival time residuals of the fundamental follow a linear anti-correlation with the fractional amplitudes that suggests hot spot motion over the surface of the neutron star both in longitude and latitude. An anti-correlation between residuals and X-ray flux suggests an influence of accretion rate on pulse phase, and casts doubts on the use of standard timing techniques to measure spin frequencies and torques on the neutron star.

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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