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arXiv 0907.2628astro-ph.HEastro-ph.GA
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X射线毫秒谱的偏振特性

Polarization properties of X-ray millisecond pulsars

Juri Poutanen

摘要:

低质量X射线双星中弱磁化中子星的X射线爆发辐射和吸积激波辐射是在电子散射主导的平面平行大气中产生的。我们首先讨论了单次(非磁性)康普顿散射产生的极化,特别是高电子温度的去极化效应,然后讨论了平板中多电子散射产生的极化。我们进一步预测了核动力和吸积动力毫秒双星的X射线脉冲轮廓和偏振特性。我们引入了一个相对论性的旋转矢量模型,该模型考虑了由于热斑的快速运动而引起的偏振面的旋转以及光的弯曲。未来对X射线偏振的观测将为检验类星体发射区的几何结构及其物理特性提供有价值的工具。

英文摘要:

Radiation of X-ray bursts and of accretion shocks in weakly magnetized neutron stars in low-mass X-ray binaries is produced in plane-parallel atmospheres dominated by electron scattering. We first discuss polarization produced by single (non-magnetic) Compton scattering, in particular the depolarizing effect of high electron temperature, and then the polarization due to multiply electron scattering in a slab. We further predict the X-ray pulse profiles and polarization properties of nuclear- and accretion-powered millisecond pulsars. We introduce a relativistic rotation vector model, which includes the effect of rotation of polarization plane due to the rapid motion of the hot spot as well as the light bending. Future observations of the X-ray polarization will provide a valuable tool to test the geometry of the emission region in pulsars and its physical characteristics.

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