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arXiv 2204.07296astro-ph.HEastro-ph.GA
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薄吸积盘线力驱动的大尺度风动力学

Large-scale Dynamics of Winds Driven by Line Force from a Thin Accretion Disk

Yi Zhu, De-Fu Bu, Xiao-Hong Yang, Feng Yuan, Wen-Bin Lin

摘要:

风在活动星系核反馈过程中起着重要的作用。以前的模拟研究风只集中在一个小的动态范围。因此,我们不知道风能吹多远,也不知道如果风能吹到很大的半径,风的性质会是什么。我们进行模拟,研究大尺度动力学的风驱动的线力。我们发现,风的属性取决于黑洞质量($M_{BH}$)和吸积盘光度。当吸积盘光度为$0.6L_{edd}$($L_{edd}$为爱丁顿光度),与$M_{BH}$无关时,风的动能通量超过$1\% L_{edd}$,可以从黑洞势逃逸。当吸积盘光度为0.3 $L_{edd}$时,风的强度随$M_{BH}$的减小而减小。如果$M_{BH}$从$10^9$减小到$10^6$太阳质量($M_\odot$),风动能通量从$\sim 0.01 L_{edd}$减小到$ \sim 10^{-6} L_{edd}$。在$M_{BH}\geq 10^7 M_\odot$的情况下,风可以从黑洞势能中逃逸。在$M_{BH}=10^6 M_\odot$的情况下,风无法逃脱。我们发现,对于硬X射线波段观测到的超快风(\citealt{Gofford et al. 2015}),线力驱动风模型可以很好地模拟出质量通量和动能通量对吸积盘光度的依赖关系.我们还发现,在软X射线波段观测到的超快风的性质可以用线力驱动风模型来解释。

英文摘要:

Winds play a significant role in active galactic nuclei feedback process. Previous simulations studying winds only focus on a small dynamical range. Therefore, it is unknown how far the winds can go and what the properties of the winds will be if they can move to large radii. We perform simulations to study the large scale dynamics of winds driven by line force. We find that the properties of the winds depend on both black hole mass ($M_{BH}$) and accretion disk luminosity. When the accretion disk luminosity is $0.6L_{edd}$ ($L_{edd}$ being Eddington luminosity), independent of $M_{BH}$, the winds have kinetic energy flux exceeding $1\% L_{edd}$ and can escape from the black hole potential. For the case with the accretion disk luminosity equaling 0.3$L_{edd}$, the strength of the winds decreases with the decrease of $M_{BH}$. If $M_{BH}$ decreases from $10^9$ to $10^6$ solar mass ($M_\odot$), the winds kinetic energy flux decreases from $\sim 0.01 L_{edd}$ to $ \sim 10^{-6} L_{edd}$. In case of $M_{BH}\geq 10^7 M_\odot$, winds can escape from black hole potential. In the case of $M_{BH}=10^6 M_\odot$, the winds can not escape. We find that for the ultra-fast winds observed in hard X-ray bands (\citealt{Gofford et al. 2015}), the observed dependence of the mass flux and the kinetic energy flux on accretion disk luminosity can be well produced by line force driven winds model. We also find that the properties of the ultra-fast winds observed in soft X-ray bands can be explained by the line force driven winds model.

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