论文标题
银河流出的能力是什么：核星爆或AGN？
What powers galactic outflows: nuclear starbursts or AGN?
论文作者
论文摘要
银河流出可以由核星爆（SB）或活性银河核（AGN）供电。有人认为，极端的星球爆炸可以为极端流出供电，而无需调用AGN反馈。但是，不能排除过去和/或隐藏的AGN活动的贡献。在这里，我们限制了中央黑洞在驱动Starburst星系中强大流出的潜在作用（没有持续的AGN活动迹象）。我们检查了银河流出是否可以通过Agn“辐射性尘土反馈”场景的框架中的AGN光度演变来解释。我们表明，局部宇宙中星爆星系的流出能量可以由幂律和指数发光度衰减定量再现，并加上辐射诱捕。同样，浓密的晦涩和轻度光度衰减的结合可能解释了早期宇宙中尘土飞扬的星系中观察到的银河流出的能量。我们讨论有关SB与AGN流出驾驶的不同物理论点，并得出结论，后者可以对星系的演变产生重大影响。
Galactic outflows can be powered either by nuclear starbursts (SB) or active galactic nuclei (AGN). It has been argued that extreme starbursts can power extreme outflows, without the need to invoke AGN feedback. However, contributions from past and/or hidden AGN activity cannot be ruled out. Here, we constrain the potential role of the central black hole in driving powerful outflows in starburst galaxies (with no sign of ongoing AGN activity). We examine whether the galactic outflows can be explained by AGN luminosity evolution in the framework of our AGN `radiative dusty feedback' scenario. We show that the outflow energetics of starburst galaxies in the local Universe can be quantitatively reproduced by power-law and exponential luminosity decays, coupled with radiation trapping. Likewise, a combination of heavy obscuration and mild luminosity decay may account for the energetics of galactic outflows observed in dusty star-forming galaxies in the early Universe. We discuss different physical arguments for SB vs. AGN outflow-driving, and conclude that the latter can have a major impact on the evolution of galaxies.
