题 目：在宇宙学模拟中探测射电喷流反馈的全局影响

主讲人：邱宇 博士

时 间：2025年9月18日15:30-16:30

地 点：雁山校区物理与电子信息学院会议室（雁山校区07424）

主办单位：申博sunbet官网

欢迎广大师生前往参加！

报告简介：

相对论性喷流是超大质量黑洞（SMBH）吸积进程中向其宿主星系释放反馈能量的重要渠道。观测上，由活动星系核（AGN）喷流形成的射电瓣可以延伸到百万秒差距尺度，远远超出宿主星系的维里半径，并与邻近星系发生相互作用。从理论上讲，射电瓣中的磁场可以影响星系的形成和动力学演化，尤其是在来自多个不同源头的喷流反馈共同作用的高密度环境中尤为显著。因此，我们利用包含磁场的宇宙磁流体动力学模拟，研究射电喷流反馈在高密度区域中的影响。通过在宇宙正午时期围绕吸积中的SMBH注入磁场驱动的喷流反馈，我们发现，随后的演化过程中，质量低于10^12倍太阳质量的暗物质晕中的重子比例显著降低。此外，喷流反馈本身就能够将微高斯量级的磁场注入到星系团际环境中，为星际间磁场的起源提供了一个除原初起源之外的全新途径。

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Probing the Global Impact of Radio Jet Feedback in Cosmological Simulations

Dr. Yu Qiu

Center for Cosmology and Computational Astrophysics, Institute for Advanced Study in Physics, Zhejiang Univeristy

Relativistic jets are an essential channel accreting SMBHs release feedback energy to the host galaxies. Observationally, the radio lobes inflated by AGN jets extend to megaparsec scales, far beyond the virial radii of the hosts to interact with nearby galaxies. Theoretically, the magnetic field within the radio lobes can impact the growth and the dynamical evolution of galaxies, especially in more overdense environments where multiple generations of jet feedback join efforts synergistically. We therefore use magneto-hydrodynamic cosmological simulations to explore the impact of radio jet feedback in overdense regions. By injecting magnetic jet feedback at cosmic noon around accreting SMBHs, we find that the baryon fraction is significantly reduced for halos <1e12 solar masses in their subsequent evolution. Additionally, jet feedback alone is capable of populating the intracluster environment with micro-Gauss level magnetic fields, providing an alternative channel, in addition to primordial origins, to generate intergalactic magnetic fields.