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arXiv 2006.01196astro-ph.GAastro-ph.HE
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建立强大的AGN对其宿主星系的影响

Establishing the impact of powerful AGN on their host galaxies

C. M. Harrison, S. J. Molyneux, J. Scholtz, M. E. Jarvis

摘要:

确定活动星系核在星系形成过程中的作用仍然是星系形成理论的最大挑战之一。为了解决这个问题,我们总结了我们最近的工作调查:(1)电离外流的物理驱动器和(2)观测签名的影响喷流/外流对恒星形成和分子气体含量在活动星系核宿主星系。我们确认无线电发射和极端电离气体运动学活动星系核主机之间的连接。发射线选择活动星系核显着更有可能表现出电离流出(跟踪的[O III]发射线),如果投影的线性范围内的无线电发射被限制在光谱孔径。后续的高分辨率射电观测和积分场光谱的10个发光的2型活动星系核揭示中等功率,年轻(或挫折)喷流与星际介质的相互作用。我们发现,这些来源生活在高度恒星形成和气体丰富的星系。此外,通过对8个z~ 2X射线活动星系核主星系的ALMA尘埃图和积分场谱的结合,我们发现H-α辐射是一种不可靠的恒星形成示踪剂。对于五个有电离流出的目标,我们没有发现恒星形成的戏剧性原位关闭。在这两项研究中,我们发现,如果这些活动星系核确实对其宿主星系产生了负面影响,那么它必须发生在小的(未解决的)空间尺度上,并且/或者尚未发生可观察到的星系范围内的影响。

英文摘要:

Establishing the role of active galactic nuclei (AGN) during the formation of galaxies remains one of the greatest challenges of galaxy formation theory. Towards addressing this, we summarise our recent work investigating: (1) the physical drivers of ionised outflows and (2) observational signatures of the impact by jets/outflows on star formation and molecular gas content in AGN host galaxies. We confirm a connection between radio emission and extreme ionised gas kinematics in AGN hosts. Emission-line selected AGN are significantly more likely to exhibit ionised outflows (as traced by the [O III] emission line) if the projected linear extent of the radio emission is confined within the spectroscopic aperture. Follow-up high resolution radio observations and integral field spectroscopy of 10 luminous Type 2 AGN reveal moderate power, young (or frustrated) jets interacting with the interstellar medium. We find that these sources live in highly star forming and gas rich galaxies. Additionally, by combining ALMA-derived dust maps with integral field spectroscopy for eight host galaxies of z~2 X-ray AGN, we show that H-alpha emission is an unreliable tracer of star formation. For the five targets with ionised outflows we find no dramatic in-situ shut down of the star formation. Across both of these studies we find that if these AGN do have a negative impact upon their host galaxies, it must be happening on small (unresolved) spatial scales and/or an observable galaxy-wide impact has yet to occur.

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