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arXiv 1402.5809astro-ph.HE
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X射线双星射电-X射线相关异常轨道的盘冕模型模拟

Modelling the `outliers' track of the radio--X-ray correlation in X-ray binaries based on disc-corona model

Chang-Yin Huang, Qingwen Wu, Ding-Xiong Wang

摘要:

本文对一个低硬态的黑洞X射线双星(BHB)样品发现了普适的射电-X射线关联(F_R \propto F_X^{b},b~0.5-0.7),它可以用喷流和辐射无效平流主导吸积流的耦合模型来粗略地解释。然而,在过去几年中发现了越来越多的“异常值”,这些异常值明显偏离了普遍的射电-X射线相关性,通常显示出更陡峭的相关性,指数约为1.4。基于简单的物理假设,辐射有效吸积流被推测存在于这些“离群点”。在这项工作中,我们测试这个问题的基础上建立模型的辐射效率盘电晕模型和混合射流模型的“离群值”的轨道。我们发现,我们的模型预测一个陡峭的无线电-X射线相关的斜率>~1.2的典型粘度参数α~0.05-0.2。特别是在α = 0.1的情况下,斜率为1.4,与H1743-322的观测结果吻合得很好。我们的研究结果表明,“离群值”的轨道可能是由光盘电晕模型。

英文摘要:

The universal radio--X-ray correlation (F_R \propto F_X^{b}, b~0.5-0.7) has been found for a sample of black-hole X-ray binaries (BHBs) in their low/hard states, which can roughly be explained by the coupled model of jet and radiatively inefficient advection dominated accretion flow. However, more and more `outliers' were found in last few years, which evidently deviate from the universal radio-X-ray correlation and usually show a much steeper correlation with an index of ~1.4. Based on simple physical assumptions, the radiatively efficient accretion flows are speculated to exist in these `outliers'. In this work, we test this issue by modelling the `outliers' track based on the radiatively efficient disc-corona model and the hybrid jet model. We find that our model predicts a steeper radio--X-ray correlation with slopes >~1.2 for the typical viscosity parameter of α~0.05-0.2. In particular, the slope is ~1.4 for the case of α~0.1, which is consistent with the observational results of H1743-322 very well. Our results suggest that the `outliers' track may be regulated by the disc-corona model.

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