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Line emission from an accretion disk around black hole: effects of the disk structure

机译:黑洞周围吸积盘的线发射:盘结构的影响

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摘要

The observed iron K-alpha fluorescence lines in Seyfert galaxies provide strong evidence for an accretion disk near a supermassive black hole as a source of the line emission. Previous studies of line emission have considered only geometrically thin disks, where the gas moves along geodesics in the equatorial plane of a black hole. Here we extend this work to include effects on line profiles from finite disk thickness, radial accretion flow and turbulence. We adopt the Novikov-Thorne solution, and find that within this framework, turbulent broadening is the most significant effect. The most prominent changes in the skewed, double-horned line profiles is a substantial reduction in the maximum flux at both red and blue peaks. We show that at the present level of signal-to-noise in X-ray spectra, proper treatment of the actual structure of the accretion disk can change estimates of the inclination angle of the disk. Thus these effects will be important for future detailed modeling of high quality observational data.
机译:在塞弗特星系中观察到的铁K-alpha荧光线为超大质量黑洞附近的吸积盘提供了有力证据,作为线发射的来源。以前关于线发射的研究只考虑了几何形状薄的圆盘,其中气体沿黑洞的赤道面中的测地线移动。在这里,我们将这项工作扩展到包括有限圆盘厚度,径向吸积流和湍流对线轮廓的影响。我们采用Novikov-Thorne解,发现在此框架内,湍流展宽是最显着的效果。偏斜,双角线轮廓中最显着的变化是红色和蓝色峰值处的最大通量都大大降低。我们表明,在当前X射线光谱中的信噪比水平下,对吸积盘实际结构的正确处理可以改变盘倾角的估计值。因此,这些影响对于将来对高质量观测数据进行详细建模非常重要。

著录项

  • 作者

    Pariev, V I; Bromley, B C;

  • 作者单位
  • 年度 1998
  • 总页数
  • 原文格式 PDF
  • 正文语种 eng
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