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arXiv 1610.01705astro-ph.HE
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射电脉冲星的X射线和转动光度关联及磁加热

X-ray and Rotational Luminosity Correlation and Magnetic Heating of the Radio Pulsars

S. Shibata, E. Watanabe, Y. Yatsu, T. Enoto, A. Bamba

摘要:

以往的工作提出了射电天体的X射线光度Lx与自转光度Lrot之间的相关性,但由于散射较大,所得到的回归线在统计上都是不可接受的。我们构建了一个具有内在Lx-Lrot关系的统计模型,并通过使用Monte Carlo模拟器再现了观察到的Lx分布,该模拟器考虑了掩盖内在关系的影响,即,辐射的各向异性、附加加热、距离的不确定性和仪器的检测极限。从ATNF脉冲星表中,我们收集到57颗有意义的普通射电天体和42颗有上限的射电天体,其中不包括高磁场天体(>10^{13} G),这些天体是单独分析的。我们得到一个统计上可接受的关系Lx(0.5 - 10 keV)= 10^{31.69}(Lrot / L_0)^{c_1},其中c_1 = 1.03 \pm 0.27,L_0 =10^{35.38}。模拟器很好地再现了所获得的Lx-Lrot关系的分布。具有异常高Lx的脉冲星可分为两类:一类是软γ射线脉冲星,另一类是与标准冷却曲线相比较的热亮脉冲星。另一方面,低Lx的恒星被发现有暗淡的脉冲星风星云。我们认为,有一个未知的机制,管理磁层发射和脉冲星风星云,它可能涉及到电子-正电子对的生产率。高场双星由于其过剩的光度而形成不同于普通双星的独特的星群。

英文摘要:

Previous works have suggested a correlation between the X-ray luminosity Lx and the rotational luminosity Lrot of the radio pulsars.However, none of the obtained regression lines are statistically acceptable due to large scatters. We construct a statistical model which has an intrinsic Lx-Lrot relation and reproduces the observed Lx distribution about it by using a Monte Carlo simulator, which takes into account the effects obscuring the intrinsic relation,i.e., the anisotropy of radiation, additional heating, uncertainty in distance and detection limit of the instruments. From the ATNF pulsar catalog we collect 57 `ordinary radio pulsars' with significant detection and 42 with upper limits.The sample does not include the high-magnetic field pulsars (>10^{13} G), which are separately analyzed. We obtain a statistically acceptable relation Lx (0.5 - 10 keV)= 10^{31.69} (Lrot / L_0)^{c_1} with c_1 = 1.03 \pm 0.27 and L_0 =10^{35.38}. The distribution about the obtained Lx-Lrot relation is reproduced well by the simulator. Pulsars with abnormally high Lx fall into two types: one is the soft gamma-ray pulsars, and the other is thermally bright pulsars in comparison with the standard cooling curve. On the other hand, pulsars showing low Lx are found to have dim pulsar wind nebulae. We argue that there is an unknown mechanism that governs both the magnetospheric emission and the pulsar wind nebulae, and it might involve the production rate of electron-positron pairs. The high-field pulsars form a distinctive population other than the ordinary pulsars due to their excess luminosities.

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