标题： 星系尺度活动星系核反馈 - 理论 显示英文标题

标题： Galaxy-scale AGN Feedback - Theory

摘要： 射电星系中的强大相对论性喷流能够驱动强烈的外流，同时通过压力触发致密云的坍缩来引发恒星形成。 我们回顾了关于活动星系核负反馈和正反馈的理论研究，讨论了最近关于喷流驱动反馈在星系尺度上的流体动力学模拟所得出的见解，这些见解适用于紧凑的射电源。 模拟显示，反馈的效率以及负反馈和正反馈的相对重要性强烈依赖于星际介质的性质，尤其是云的柱密度和空间分布。 如果云呈球形分布且单个云的柱密度较小，负反馈最有效；而如果云主要呈盘状配置，正反馈最有效。 显示英文摘要

摘要： Powerful relativistic jets in radio galaxies are capable of driving strong outflows but also inducing star-formation by pressure-triggering collapse of dense clouds. We review theoretical work on negative and positive active galactic nuclei feedback, discussing insights gained from recent hydrodynamical simulations of jet-driven feedback on galaxy scales that are applicable to compact radio sources. The simulations show that the efficiency of feedback and the relative importance of negative and positive feedback depends strongly on interstellar medium properties, especially the column depth and spatial distribution of clouds. Negative feedback is most effective if clouds are distributed spherically and individual clouds have small column depths, while positive feedback is most effective if clouds are predominantly in a disc-like configuration.