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arXiv 1807.07074astro-ph.GA
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z=2时典型大质量星系活动星系核驱动外流的分子和电离气相

The Molecular and Ionized Gas Phases of an AGN-driven Outflow in a Typical Massive Galaxy at z=2

R. Herrera-Camus, L. J. Tacconi, R. Genzel, N. M. Foerster Schreiber, D. Lutz, A. D. Bolatto, S. Wuyts, A. Renzini, S. J. Lilly, S. Belli, H. Uebler, T. Shimizu… 展开作者

R. Herrera-Camus, L. J. Tacconi, R. Genzel, N. M. Foerster Schreiber, D. Lutz, A. D. Bolatto, S. Wuyts, A. Renzini, S. J. Lilly, S. Belli, H. Uebler, T. Shimizu, R. Davies, E. Sturm, F. Combes, J. Freundlich, S. Garcia-Burillo, P. Cox, A. Burkert, T. Naab, L. Colina, A. Saintonge, M. Cooper, C. Feruglio, A. Weiss

摘要:

吸积的大质量黑洞驱动的核外流是在高z激发的主要反馈机制之一,以再现恒星形成的盘状星系和静止的球状系统之间的明显分离。然而,我们对高z反馈的了解仍然受到缺乏星系外流中多个气相观测的限制。在这项工作中,我们使用新的深,高空间分辨率的ALMA CO(3-2)和档案VLT/SINFONI H $α$观测研究的分子和电离成分的活动星系核驱动流出zC 400528-一个大质量,主序星星系在z=2.3的淬火过程中。我们检测到一个强大的分子外流,显示出正的速度梯度,并从核区域延伸至少~10千秒差距,约三倍的电离风的预计大小。外流中的分子气体没有达到足够高的速度来逃离星系,因此预计会重新吸积。考虑到分析中涉及的各种假设,我们发现流出的质量和能量由分子相决定。zC 400528中活动星系核驱动的外流足够强大,可以在至少比恒星形成所需的时间短两倍的时间内耗尽分子气体库。这表明,核外流是zC 400528中心恒星形成活动被抑制的主要猝灭引擎之一。

英文摘要:

Nuclear outflows driven by accreting massive black holes are one of the main feedback mechanisms invoked at high-z to reproduce the distinct separation between star-forming, disk galaxies and quiescent spheroidal systems. Yet, our knowledge of feedback at high-z remains limited by the lack of observations of the multiple gas phases in galaxy outflows. In this work we use new deep, high-spatial resolution ALMA CO(3-2) and archival VLT/SINFONI H$α$ observations to study the molecular and ionized components of the AGN-driven outflow in zC400528 ---a massive, main sequence galaxy at z=2.3 in the process of quenching. We detect a powerful molecular outflow that shows a positive velocity gradient and extends for at least ~10 kpc from the nuclear region, about three times the projected size of the ionized wind. The molecular gas in the outflow does not reach velocities high enough to escape the galaxy and is therefore expected to be reaccreted. Keeping in mind the various assumptions involved in the analysis, we find that the mass and energetics of the outflow are dominated by the molecular phase. The AGN-driven outflow in zC400528 is powerful enough to deplete the molecular gas reservoir on a timescale at least twice shorter than that needed to exhaust it by star formation. This suggests that the nuclear outflow is one of the main quenching engines at work in the observed suppression of the central star-formation activity in zC400528.

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