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arXiv 2407.05729astro-ph.HE
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外流在黑洞X射线双星中的作用

The role of outflows in black-hole X-ray binaries

N. Kylafis, P. Reig

AI总结:

本研究提出一种基于外流冕区康普顿化的模型,仅用两个参数即可定量重现黑洞X射线双星中五个观测相关性,并解释了X射线偏振现象。

摘要:

黑洞X射线双星中的热内流并非仅仅是围绕黑洞旋转的静态冕区,而必然有部分物质向外流出。我们建立了一个模型,其中康普顿化过程发生在这个外流冕区中。我们能够定量地重现五个观测相关性:a) 时间延迟作为傅里叶频率的函数,b) 时间延迟作为光子能量的函数,c) 时间延迟作为 $Γ$ 的函数,d) 时间延迟作为光谱中截断能量的函数,以及 e) 长期存在的射电-X射线相关性。所有这些相关性仅需两个参数(外流的光学深度和宽度),且这些参数在所有相关性中均在相同范围内变化。我们的模型不需要一个致密、狭窄的相对论性喷流,尽管它的存在也不会影响结果。我们模型的关键要素是康普顿化冕区的抛物面形状。外流速度也起着次要作用。此外,在硬态下,外流的底部对于来自盘的入射软光子来说看起来像一个“板”,这可以解释观测到的X射线偏振,其方向沿着外流方向。

英文摘要:

The hot inner flow in black-hole X-ray binaries is not just a static corona rotating around the black hole, but it must be partially outflowing. We have developed a model, in which Comptonization takes place in this outflowing corona. We are able to reproduce quantitatively five observed correlations: a) the time lag as a function of Fourier frequency, b) the time lag as a function of photon energy, c) the time lag as a function of $Γ$, d) the time lag as a function of the cut-off energy in the spectrum, and e) the long-standing radio - X-ray correlation. All of them with only two parameters (optical depth and width of the outflow), which vary in the same ranges for all the correlations. Our model does not require a compact, narrow relativistic jet, although its presence does not affect the results. The essential ingredient of our model is the parabolic shape of the Comptonizing corona. The outflow speed also plays a minor role. Furthermore, the bottom of the outflow, in the hard state, looks like a ``slab'' to the incoming soft photons from the disk, and this can explain the observed X-ray polarization, which is along the outflow.

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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