Thermal and non-thermal traces of AGN feedback: results from cosmological AMR simulations

Thermal and non-thermal traces of AGN feedback: results from cosmological AMR simulations
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AGN 反馈的热迹和非热迹:宇宙学 AMR 模拟的结果

DOI:
10.1093/mnras/sts213
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发表时间:
2013
影响因子:
4.8
通讯作者:
Gheller
Gheller
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Brüggen;Gheller

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研究了活动星系核反馈对团内介质非热成分的影响。我们已经模拟了反馈活动星系核的宇宙学模拟与自适应网格细化codeenzo,调查三种类型的反馈,有时被称为类星体,喷流和无线电模式。利用一小组高分辨率模拟的星系团,我们模拟了宇宙射线的注入和演化,以及它们对热等离子体的影响。通过比较ACCEPT样品的热气体分布与观测分布,以及次级γ射线辐射与费米实验的上限,讨论了这两个观测量的联合分析如何约束团簇中反馈模型的能量学和机制.活动星系核反馈的那些模式与X射线观测结果有很好的匹配,产生的次级宇宙射线产生的γ射线亮度比费米给出的上限低10倍。此外,我们研究了湍流运动从活动星系核注入ICM,并通过分析Fexxiii线的增宽,这些运动的可探测性。在不久的将来,更深入的观测/上限的非热辐射星系团将产生严格的约束的能量和模式的活动星系核反馈,即使在早期宇宙时代。
We investigate the observable effects of feedback from active galactic nuclei (AGN) on non-thermal components of the intracluster medium (ICM). We have modelled feedback from AGN in cosmological simulations with the adaptive mesh refinement codeenzo, investigating three types of feedback that are sometimes called quasar, jet and radio mode. Using a small set of galaxy clusters simulated at high resolution, we model the injection and evolution of cosmic rays, as well as their effects on the thermal plasma. By comparing both the profiles of thermal gas to observed profiles from the ACCEPT sample and the secondary γ-ray emission to the available upper limits fromFermi, we discuss how the combined analysis of these two observables can constrain the energetics and mechanisms of feedback models in clusters. Those modes of AGN feedback that provide a good match to X-ray observations yield a γ-ray luminosity resulting from secondary cosmic rays that is about 10 times below the available upper limits fromFermi. Moreover, we investigate the injection of turbulent motions into the ICM from AGN, and the detectability of these motions via the analysis of line broadening of the Fexxiiiline. In the near future, deeper observations/upper limits of non-thermal emissions from galaxy clusters will yield stringent constraints on the energetics and modes of AGN feedback, even at early cosmic epochs.
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