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arXiv 1805.04578astro-ph.HE
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小麦哲伦云脉冲星SXP 1323的X射线光度与脉冲分数的反相关

Anti-correlation between X-ray luminosity and pulsed fraction in the Small Magellanic Cloud pulsar SXP 1323

Jun Yang, Andreas Zezas, Malcolm J. Coe, Jeremy J. Drake, JaeSub Hong, Silas G. T. Laycock, Daniel R. Wik

摘要:

我们报告的证据之间的反相关的脉冲分数(PF)和亮度的X射线脉冲星SXP 1323,发现第一次在光度范围$10^{35}$ -$10^{37}$尔格s $^{-1}$从观测跨越15年。在我们对小麦哲伦云(SMC)中其它X射线谱线的管道分析中,观测到了当源通量增加时,X射线谱线强度减小的现象。由于螺旋桨效应,当PF减小时,在一定值以下的光度会减小。在螺旋桨区域上方,PF和通量之间的反相关可能由于总发射的非脉冲分量的增加或脉冲分量的减少而发生。另外的吸积模式也是可能的,例如球形吸积和发射几何形状的变化。在更高的质量吸积速率下,吸积盘也可以延伸到更接近中子星(NS)表面的地方,在那里,减小的内半径导致更热的内盘发射。这些模式的等离子体吸积可能会影响到扇形束占主导地位的发射的光束配置的变化。

英文摘要:

We report the evidence for the anti-correlation between pulsed fraction (PF) and luminosity of the X-ray pulsar SXP 1323, found for the first time in a luminosity range $10^{35}$--$10^{37}$ erg s$^{-1}$ from observations spanning 15 years. The phenomenon of a decrease in X-ray PF when the source flux increases has been observed in our pipeline analysis of other X-ray pulsars in the Small Magellanic Cloud (SMC). It is expected that the luminosity under a certain value decreases as the PF decreases due to the propeller effect. Above the propeller region, an anti-correlation between the PF and flux might occur either as a result of an increase in the un-pulsed component of the total emission or a decrease of the pulsed component. Additional modes of accretion may also be possible, such as spherical accretion and a change in emission geometry. At higher mass accretion rates, the accretion disk could also extend closer to the neutron star (NS) surface, where a reduced inner radius leads to hotter inner disk emission. These modes of plasma accretion may affect the change in the beam configuration to fan-beam dominant emission.

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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