论文标题
从黑洞围绕对流为主的积聚流的最内向区域的稳定喷射弹射
Steady jet ejections from the innermost region of advection-dominated accretion flow around a black hole
论文作者
论文摘要
我们研究了两种稳定喷气机的弹出机制：一种从低/硬状态下的黑洞二进制物观察到，另一种是从SS433中观察到的。喷射气体的特定能量必须使喷气机到达无穷大，而在吸积流的最外界边界上，积聚气体的特定能量被天真地认为是负的。为了调和特定能量的相反迹象，我们提出了一种情况，即吸积流中存在两个层，一个层从另一层中获得能量足以使特定能量为正。对于低/硬状态下的稳定喷射，积聚流的最外端的吸积环被认为产生两层流量，其中几何厚的ADAF夹层一个几何薄的吸积盘，并且薄磁盘应该转向内侧的另一个ADAF。预计能量传递将通过两层之间的湍流混合而发生，并讨论上层的上层，以使正比能量足够大，以使终端速度为$ \ sim $ 0.1 $ c $。对于来自SS433的稳定射流，由于在以对流为主的情况下垂直于赤道平面的方向沿垂直于赤道平面的方向的光子扩散，因此有人认为纤细的磁盘分为两个分层层。在这种情况下，上层的特定能量预计为正，因此终端速度超过0.2 $ c $。两层案例通常研究了黑洞附近的喷射弹射过程，并预测喷气开口角变为2 $^{\ circ} $。
We study ejection mechanisms for two kinds of steady jets: one observed from black hole binaries in the low/hard state and the other from SS433. The specific energy of the ejected gas is required to be positive for the jets to get to infinity, while that of the accreted gas is naively considered to be negative at the outermost boundary of the accretion flow. To reconcile the opposite sign of the specific energies, we propose a situation where two layers exist in the accretion flow and one layer receives energy from the other sufficiently for the specific energy to be positive. For the steady jets in the low/hard state, the accretion ring at the outermost end of the accretion flow is considered to yield two-layer flow in which a geometrically thick ADAF sandwiches a geometrically thin accretion disk and the thin disk is supposed to turn to another ADAF on the inner side. The energy transfer is expected to occur through turbulent mixing between the two layers and the upper layer is discussed to have the positive specific energy large enough for the terminal velocity to be $\sim$ 0.1 $c$. For the steady jets from SS433, a slim disk is argued to separate into two stratified layers due to the photon diffusion in the direction perpendicular to the equatorial plane under the advection dominated situation. In this case, the specific energy of the upper layer is expected to be positive such that the terminal velocity exceeds 0.2 $c$. The jet ejection process near the black hole is investigated commonly to both the two-layer cases and predicts the jet opening angle becomes as small as 2$^{\circ}$.
