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X-RAY PULSES FROM ACCRETION COLUMNS: CONTRIBUTIONS TO THE ENERGY DEPENDENCE OF THE PULSE SHAPE

机译:堆积柱的X射线脉冲:对脉冲形状能量依赖性的贡献

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摘要

We study the pulse profiles of medium-luminosity binary X-ray pulsars in the framework of a column model. The model includes relativistic effects in a Schwarzschild spacetime and the dipolar shape of the accretion funnel. It takes into account mechanisms that are expected to be of major importance for the energy dependence of the pulse shape: energy-dependent local beaming of radiation leaving the column, the luminous halo formed by illumination of the neutron star surface, and magnetic scattering in the upper accretion stream. Beam patterns and pulse profiles are calculated for different values of mass and radius of the neutron star and different local beaming functions. The results illustrate that the energy dependence of the pulse profiles is to a large degree determined by the energy-dependent relative importance of the halo and column contributions to the observed flux.
机译:我们在圆柱模型的框架内研究中等发光度的二元X射线脉冲星的脉冲轮廓。该模型包括Schwarzschild时空中的相对论效应和吸积漏斗的偶极形状。它考虑了预期对脉冲形状的能量依赖性至关重要的机理:离开柱子的辐射的能量依赖性局部束,由中子星表面照射形成的光晕以及辐射中的磁散射。上吸积流。针对中子星的质量和半径的不同值以及不同的局部波束功能,计算了波束图和脉冲轮廓。结果表明,脉冲轮廓的能量依赖性在很大程度上取决于光晕和色谱柱对观测通量的能量依赖性相对重要性。

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