Interpreting the radio/X-ray correlation of black hole X-ray binaries based on the accretion–jet model
Interpreting the radio/X-ray correlation of black hole X-ray binaries based on the accretion–jet model
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基于吸积射流模型解释黑洞 X 射线双星的射电/X 射线相关性
DOI：
10.1093/mnras/stv2956
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发表时间：
2015-09
影响因子：
4.8
通讯作者：
Feng Yuan
中科院分区：
文献类型：
--
作者：
Fu-Guo Xie;Feng Yuan
在黑洞X射线双星中发现了射电光度和X射线光度之间的两种关联($L_R$和$L_X$)。对于某些来源，它们遵循由单一的幂定律描述的“原始”类型的相关性。后来发现，其他一些来源遵循一种不同的相关性，由三个幂函数分支组成，每个分支具有不同的幂函数指数。在这项工作中，我们解释了在耦合吸积-喷流模型下的这两种关联。我们将这两种来源之间的差异归因于粘度参数$\α$的不同取值。一个可能的原因是来自伴星的吸积物质中磁场的配置不同。对于“单次幂定律”源，它们的α值较高，因此在整个X射线光度范围内，它们的吸积总是处于平流主导吸积流(ADAF)的模式。对于那些‘混合幂定律’源，α‘的值很小，因此随着吸积率的增加，它们的吸积模式从ADAF到发光的热吸积流，最终变成两相吸积。由于辐射效率对质量吸积率的依赖关系对于这三种吸积模式是不同的，因此在$L_R--L_X$关联式中应该有不同的幂指数。得到了射流中质量损失率与吸积流中质量吸积率之比的约束条件，这些约束条件可用辐射磁流体力学数值模拟来验证。
Two types of correlations between the radio and X-ray luminosities ($L_R$ and $L_X$) have been found in black hole X-ray binaries. For some sources, they follow the `original' type of correlation which is described by a single power-law. Later it was found that some other sources follow a different correlation consisting of three power-law branches, with each branch having different power-law indexes. In this work, we explain these two types of correlation under the coupled accretion--jet model. We attribute the difference between these two types of sources to the different value of viscosity parameter $\alpha$. One possible reason for different $\alpha$ is the different configuration of magnetic field in the accretion material coming from the companion stars. For the `single power-law' sources, their $\alpha$ is high; so their accretion is always in the mode of advection-dominated accretion flow (ADAF) for the whole range of X-ray luminosity. For those `hybrid power-law' sources, the value of $\alpha$ is small so their accretion mode changes from an ADAF to a luminous hot accretion flow, and eventually to two-phase accretion as the accretion rate increases. Because the dependence of radiative efficiency on the mass accretion rate is different for these three accretion modes, different power-law indexes in the $L_R--L_X$ correlation are expected. Constraints on the ratio of the mass loss rate into the jet and the mass accretion rate in the accretion flow are obtained, which can be tested in future by radiative magnetohydrodynamic numerical simulations of jet formation.
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DOI：
10.1086/527542
发表时间：
2007-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
J. Wrobel;Y. Terashima;L. Ho
通讯作者：
J. Wrobel;Y. Terashima;L. Ho
DOI：
10.1111/j.1365-2966.2012.22030.x
发表时间：
2012-07
影响因子：
4.8
作者：
Xie, Fu-Guo;Yuan, Feng
通讯作者：
Yuan, Feng
紫外发射的起源与低光度活动星系核吸积模型
影响因子：
4.9
作者：
Yu, Zhaolong;Yuan, Feng;Ho, Luis C.
通讯作者：
Ho, Luis C.
影响因子：
6.5
作者：
E. Meyer-Hofmeister;F. Meyer
通讯作者：
E. Meyer-Hofmeister;F. Meyer
DOI：
10.1086/522585
发表时间：
2007-05
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
M. Pessah;Chi-kwan Chan;D. Psaltis
通讯作者：
M. Pessah;Chi-kwan Chan;D. Psaltis