论文标题
AGN酷反馈和与X射线二进制的类比：从辐射压力到宇宙射线驱动的流出
AGN cool feedback and analogy with X-ray binaries: from radiation pressure to cosmic ray driven outflows
论文作者
论文摘要
现在在星系中通常观察到凉爽的流出，但是它们的物理起源和驾驶机制尚不清楚。主动银河核（AGN）反馈可以通过宇宙射线（CR）和灰尘上的辐射压力加速凉爽的银河流出。在这里，我们研究了CR和辐射反馈在AGN中的相对重要性，并分析了流出启动的物理条件，这是黑洞积聚流量模式的函数。我们假设来自AGN Jet Origin的CR，并考虑与银河X射线二进制文件的类比，从而以低吸积率（硬状态）突出射流，并以高积聚速率（软状态）淬灭。我们表明，CR驱动的流出可以以低积聚速率和较大的半径为动力，而辐射压力驱动的流出以高积聚速率和小半径为主导。因此，两种AGN反馈机制 - CRS和灰尘上的辐射压力 - 可能在驱动银河尺度上的凉爽流出方面起着互补的作用。从较高的吸积率以较高的吸积速率流出到较低吸积率的CR驱动流出的过渡可能对应于基础吸积流模式的转变（从辐射有效的积聚盘到辐射效率低下的射流降低的射流流量，在宇宙时间内）。
Cool outflows are now commonly observed in galaxies, but their physical origin and driving mechanism remain unclear. Active galactic nucleus (AGN) feedback can potentially accelerate cool galactic outflows via cosmic rays (CR) and radiation pressure on dust. Here we investigate the relative importance of CR and radiation feedback in AGNs, and we analyse the physical conditions for outflow launching as a function of the black hole accretion flow mode. We assume CRs from AGN jet origin and consider the analogy with Galactic X-ray binaries, whereby the jet is prominent at low accretion rates (hard state) and quenched at high accretion rates (soft state). We show that CR-driven outflows can be powered at low accretion rates and at large radii, whereas radiation pressure-driven outflows dominate at high accretion rates and small radii. Thus the two AGN feedback mechanisms -- CRs and radiation pressure on dust -- may play complementary roles in driving cool outflows on galactic scales. The transition from radiation pressure-driven outflows at higher accretion rates to CR-driven outflows at lower accretion rates likely corresponds to a transition in the underlying accretion flow modes (from a radiatively efficient accretion disc to a radiatively inefficient jet-dominated flow) over cosmic time.
