外流、气泡和射电喷流的作用：z~2处AGN反馈的直接证据
Outflows, Bubbles, and the Role of the Radio Jet: Direct Evidence for AGN Feedback at z~2
摘要：
为了适应看似“反层次”的性质，在我们的层次范式的质量函数的上端附近的星系，目前的星系演化模型假设在高红移，有效地终止恒星形成淬火供应的冷气体的阶段，有力的活动星系核反馈。利用VLT上的SINFONI IFU，我们在z~2-3射电星系中发现了kpc大小的电离气体外流，这些外流具有预期的特征，是具有终止大质量宿主星系中恒星形成潜力的强大活动星系核驱动风。双极流出物中含有几个x 10^10 M_sun的电离气体，其速度接近大质量星系的逃逸速度。动能相当于超大质量黑洞静止质量的0.2%。我们讨论了这项正在进行的研究的结果和所观察到的外流的全球影响。
英文摘要：
To accommodate the seemingly "anti-hierarchical" properties of galaxies near the upper end of the mass function within our hierarchical paradigm, current models of galaxy evolution postulate a phase of vigorous AGN feedback at high redshift, which effectively terminates star formation by quenching the supply of cold gas. Using the SINFONI IFU on the VLT, we identified kpc-sized outflows of ionized gas in z~2-3 radio galaxies, which have the expected signatures of being powerful AGN-driven winds with the potential of terminating star formation in the massive host galaxies. The bipolar outflows contain up to few x 10^10 M_sun in ionized gas with velocities near the escape velocity of a massive galaxy. Kinetic energies are equivalent to ~0.2% of the rest mass of the supermassive black hole. We discuss the results of this on-going study and the global impact of the observed outflows.
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