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arXiv 0804.1592astro-ph
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各向异性超相对论电子的回旋谱:X射线脉冲星谱的解释

The cyclotron spectrum of anisotropic ultrarelativistic electrons: interpretation of X-ray pulsar spectra

A. N. Baushev

摘要:

本文计算了具有强各向异性速度分布的电子产生的回旋辐射谱。假设电子沿磁场的运动是超相对论的,而在磁场的另一端是非相对论的。所得到的频谱的一个特征是各阶谐波的间隔不相等。本文分析了四种高次回旋谐波X射线谱的物理性质和观测谱。所有四颗双星光谱中的回旋特征只能解释为发射谱线。此外,观察到的谐波是不等距的,并显示出某些其他特性的发射特征的强各向异性超相对论电子。此外,也有间接的理论论据,即在X射线谱中产生回旋特征的电子是超相对论的,并且具有强各向异性分布的特征。因此,对X射线辐射源的磁场(通常由回旋加速器线的能量得出)和某些其他物理参数的估计需要进行重大修订。

英文摘要:

The spectrum of cyclotron radiation produced by electrons with a strongly anisotropic velocity distribution is calculated taking into account higher harmonics. The motion of the electrons is assumed to be ultrarelativistic along the magnetic field and nonrelativistic across the field. One characteristic feature of the resulting spectrum is that harmonics of various orders are not equally spaced. The physical properties and observed spectra of four X-ray pulsars displaying higher cyclotron harmonics are analyzed. The cyclotron features in the spectra of all four pulsars can be interpreted only as emission lines. Moreover, the observed harmonics are not equidistant, and display certain other properties characteristic of emission by strongly anisotropic ultrarelativistic electrons. In addition, there are indirect theoretical arguments that the electrons giving rise to cyclotron features in the spectra of X-ray pulsars are ultrarelativistic and characterized by strongly anisotropic distributions. As a result, estimates of the magnetic fields of X-ray pulsars (which are usually derived from the energies of cyclotron lines) and certain other physical parameters require substantial revision.

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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