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arXiv 0901.0462astro-ph.HE
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船帆座脉冲星X射线-射电相关的解释

Toward explanation of the X-ray - radio correlation in the Vela pulsar

S. A. Petrova

摘要:

最近对船帆座脉冲星的观测揭示了它在软X射线和射电范围内的发射的特殊联系。提出了Vela脉冲星射电脉冲形成的模型,发展了射电光子再加工到高能的理论,并在此基础上解释了观测到的X射线-射电联系。研究了螺旋粒子对无线电波的自发散射和诱导散射过程及其观测结果。粒子被假定为获得相对论回转能量,由于共振吸收的无线电发射的外磁层的脉冲星。分析了自发散射功率的谱分布和角分布,并与粒子同步辐射的特性进行了比较。研究了感应散射过程中射束强度向背景强度传递的后果。它表明,诱导散射可以解释船帆座的无线电剖面和脉冲到脉冲的波动的基本特征。特别是,它可以解释一个更大的作用,领先的组成部分和它的更早到达更强的脉冲。在船帆座脉冲星上应用射电光子再处理到高能的研究表明,散射和同步辐射谱的峰值分别在0.8和0.2 keV,相应的光度分别为10 ^{29} erg s ^{-1}和10 ^{31} erg s ^{-1}。在我们的模型的框架内,所观察到的X射线无线电连接解释的感应和自发散射的无线电脉冲的过程之间的相互作用。

英文摘要:

Recent observations of the Vela pulsar have revealed a peculiar connection of its emission in the soft X-ray and radio ranges. We suggest the model of the radio pulse formation in the Vela pulsar, develop the theory of the radio photon reprocessing to high energies and on this basis interpret the observed X-ray - radio connection. The processes of spontaneous and induced scattering of radio waves off the spiraling particles and their observational consequences are examined. The particles are assumed to acquire relativistic gyration energies due to resonant absorption of the radio emission in the outer magnetosphere of a pulsar. The spectral and angular distributions of the spontaneously scattered power are analyzed and compared with the characteristics of the particle synchrotron emission. The consequences of intensity transfer from the radio beam to the background in the course of induced scattering are studied as well. It is demonstrated that the induced scattering can account for the basic features of the Vela's radio profile and its pulse-to-pulse fluctuations. In particular, it can explain a greater role of the leading component and its earlier arrival in stronger pulses. The studies of the radio photon reprocessing to high energies in application to the Vela pulsar shows that the scattered and synchrotron spectra peak at 0.8 and 0.2 keV, respectively, with the corresponding luminosities of 10^{29} erg s^{-1} and 10^{31} erg s^{-1}. Within the framework of our model, the observed X-ray - radio connection is explained in terms of the interplay between the processes of induced and spontaneous scattering of the radio pulse.

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