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arXiv 2602.06128astro-ph.GA
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活动星系核驱动的风对集团星际介质的影响:高红移类星体周围Lyα星云的案例

The imprint of AGN-driven outflows on the CGM: the case of Lyα nebulae around high-z quasars

European Southern Observatory(欧洲南方天文台);Max-Planck-Institut für extraterrestrische Physik(马克斯·普朗克地外物理研究所);Centre for Astrophysics Research, University of Hertfordshire(赫特福德大学天体物理学研究中心);Max-Planck-Institut für Astrophysik(马克斯·普朗克天体物理研究所);Newcastle University(纽卡斯尔大学);International Gemini Observatory/NSF NOIRLab(国际双子座天文台/美国国家光学红外天文实验室);INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学观测站)

Silvia C. Rueda-Vargas, Vincenzo Mainieri, Giulia Tozzi, Darshan Kakkad, Fabrizio Arrigoni-Battaia, Tiago Costa, Emanuele Paolo Farina, Chris M. Harrison

AI总结:

本文通过观测六颗高红移类星体的出流和Lyα星云物理特性,验证了AGN驱动的风在星际介质尺度上为Lyα光子提供低光学深度通道的理论预测。

摘要:

一些宇宙学水动力学模拟预测,活动星系核(AGN)驱动的风在 powering 高红移类星体周围的Lyα星云中起关键作用。在这些模拟中,AGN反馈作为强大风导致扩展且明亮的星云,其形态和表面亮度剖面准确重现观测结果,而抑制AGN反馈则导致紧凑且暗淡的星云。这种联系可能源于风打开了一条Lyα光子从银河核到星群星际介质(CGM)的通道。本文的主要目的是通过比较出流和Lyα星云的物理特性来测试这一理论预测。我们分析了通过VLT/ERIS和GEMINI/GNIRS获得的积分场单元数据,利用[O III]发射线追踪六颗高红移类星体的星际介质中的电离气体。我们发现所有样本中的类星体都有强大的风,速度>1500 km/s,动能>2×10^43 erg/s。四颗类星体在空间上可分辨,并显示出扩展的[O III]发射到距离中心超大质量黑洞>2 kpc处的迹象。排除一个异常值后,我们发现风功率与Lyα星云大小(ρ=0.89,p=0.03)和亮度(ρ=0.6,p=0.28)之间存在正单调相关性。此外,我们发现电离锥与Lyα星云的内侧和最亮区域之间存在空间对齐证据。我们的结果提供了对理论预测的初步支持,即AGN驱动的风在星际介质尺度上为中央Lyα光子提供低光学深度通道,使其到达CGM并形成扩展的星云。

英文摘要:

Some cosmological hydrodynamical simulations predict that outflows driven by active galactic nuclei (AGN) play a key role in powering the Ly$α$ nebulae observed around high-redshift quasars. In such simulations, AGN feedback seeded as powerful outflows leads to extended and luminous nebulae whose morphology and surface-brightness profiles accurately reproduce the observations, while suppressing AGN feedback leads to compact and faint nebulae. This link might arise from outflows opening up a channel for Ly$α$ photons to escape from the galactic nucleus to the circumgalactic medium (CGM). The main aim of this paper is to test this theoretical prediction using observations, by comparing the physical properties of outflows and Ly$α$ nebulae. We analyze integral-field unit data obtained with VLT/ERIS and GEMINI/GNIRS to trace the ionized gas in the interstellar medium (ISM) of a sample of six quasars at $z\sim2-3$, using the [O III] emission line. We detect powerful outflows in all the quasars of our sample, with velocities $>1500~\mathrm{km~s^{-1}}$ and kinetic energies $ \gtrsim 2\times10^{43}~\mathrm{erg~s^{-1}}$. Four of our quasars are spatially resolved and show signs of extended [O III] emission out to distances $>2$ kpc from the central supermassive black hole. When excluding one outlier, we find a positive monotonic correlation between the outflow power and the Ly$α$ nebulae size ($ρ=0.89$, $p=0.03$) and luminosity ($ρ=0.6$, $p=0.28$). Additionally, we find evidence of spatial alignment between the ionization cone and the inner and brightest regions of the Ly$α$ nebula. Our results provide tentative evidence in support of the theoretical prediction that AGN-driven outflows at ISM scales open a low-optical-depth path for central Ly$α$ photons to reach the CGM and create extended nebulae.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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