星系团中AGN对cosmic ray反馈的模拟
Simulations of cosmic ray feedback by AGN in galaxy clusters
摘要：
我们研究了活动星系核反馈的一个数值模型，其中第一次在一个完整的宇宙学背景下，在活动星系核膨胀的气泡中的相对论粒子种群。在我们对星系团形成的高分辨率模拟中，我们假设BH吸积伴随着两种不同模式的能量反馈，这取决于吸积速率本身。与以前的工作不同，我们注入一个非热粒子人口的相对论质子到AGN气泡，而不是采取一个纯粹的热加热。然后，我们遵循随后的宇宙射线（CR）等离子体内部的气泡的演变，考虑其流体动力学相互作用和耗散过程相关的CR人口。由于相对论等离子体浮力的不同和相对较长的CR耗散时间尺度，我们发现由于CR反馈，团簇的演化发生了实质性的变化。特别是，非热人口可以提供显着的压力支持，在中心集群区域在低的热温度，提供了一个自然的解释，在冷核心集群中发现的温度下降的分布。与此同时，气泡和诱导的X射线空腔的形态显示出与观测结果惊人的相似性。活动星系核反馈与CR也证明有效地调节集群冷却流，使总重子分数的恒星成为有限的现实值的顺序为10%。我们发现，部分CR支持的团内气体也会影响预期的信号的热Sunyaev-Zel'dovich效应，典型的修改的维里半径内的顺序为10%的综合康普顿-y参数。[摘要]
英文摘要：
We investigate a numerical model for AGN feedback where for the first time a relativistic particle population in AGN-inflated bubbles is followed within a full cosmological context. In our high-resolution simulations of galaxy cluster formation, we assume that BH accretion is accompanied by energy feedback that occurs in two different modes, depending on the accretion rate itself. Unlike in previous work, we inject a non-thermal particle population of relativistic protons into the AGN bubbles, instead of adopting a purely thermal heating. We then follow the subsequent evolution of the cosmic ray (CR) plasma inside the bubbles, considering both its hydrodynamical interactions and dissipation processes relevant for the CR population. Due to the different buoyancy of relativistic plasma and the comparatively long CR dissipation timescale we find substantial changes in the evolution of clusters as a result of CR feedback. In particular, the non-thermal population can provide significant pressure support in central cluster regions at low thermal temperatures, providing a natural explanation for the decreasing temperature profiles found in cool core clusters. At the same time, the morphologies of the bubbles and of the induced X-ray cavities show a striking similarity to observational findings. AGN feedback with CRs also proves efficient in regulating cluster cooling flows so that the total baryon fraction in stars becomes limited to realistic values of the order of 10%. We find that the partial CR support of the intracluster gas also affects the expected signal of the thermal Sunyaev-Zel'dovich effect, with typical modifications of the integrated Compton-y parameter within the virial radius of the order of 10%. [Abridged]
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