PROSPECTS OF HIGH-RESOLUTION X-RAY SPECTROSCOPY FOR ACTIVE GALACTIC NUCLEUS FEEDBACK IN GALAXY CLUSTERS
PROSPECTS OF HIGH-RESOLUTION X-RAY SPECTROSCOPY FOR ACTIVE GALACTIC NUCLEUS FEEDBACK IN GALAXY CLUSTERS
复制标题
高分辨率 X 射线光谱研究星系团活动星系核反馈的前景
DOI：
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
B. Morsony
中科院分区：
文献类型：
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作者：
S. Heinz;M. Brüggen;B. Morsony
钱德拉时代的遗产之一是发现活动星系核（AGN）膨胀的X射线腔几乎在所有冷核星系团中，其机械光度与星系团冷却速率相当或大于星系团冷却速率，这表明活动星系核可能是加热星系团的原因。这一发现提出了一系列新的问题，这些问题不能单独通过X射线成像或建模来解决：活动星系核是否真的负责停止冷却流？活动星系核的能量是如何转化为热能的？观察到的加热和冷却之间的平衡有多紧？目前提出的一个关键的未回答的问题是这些空腔的实际膨胀速度，这不能单独从成像中测量。这种不确定性传播到所需的充气腔的喷射功率的计算，并影响反馈功率的所有参数。使用数值模拟的射流驱动腔在完全动态演化的集群和一个新的虚拟X射线天文台工具，我们证明，高分辨率，高通量的X射线光谱将能够回答这个问题，国际X射线天文台将有必要的能力，提供必要的测量。我们还讨论了星系团的湍流速度分布的演化，以响应射电星系的行动，以及它如何可能被用来作为研究反馈的探针。
One of the legacies of the Chandra era is the discovery of active galactic nucleus (AGN) inflated X-ray cavities in virtually all cool-core clusters, with mechanical luminosities comparable to or larger than the cluster cooling rate, suggesting that AGN might be responsible for heating clusters. This discovery poses a new set of questions that cannot be addressed by X-ray imaging or modeling alone: are AGNs actually responsible for halting cooling flows? How is the AGN energy transferred to heat? How tight is the observed balance between heating and cooling? One of the critical unanswered questions currently posed is the actual expansion velocity of these cavities, which cannot be measured from imaging alone. This uncertainty propagates into the calculation of the jet power required to inflate the cavities and affects all arguments of feedback power. Using numerical simulations of jet-driven cavities in fully dynamically evolved clusters and a new virtual X-ray observatory tool, we demonstrate that high-resolution, high-throughput X-ray spectroscopy will be able to answer this question and that the International X-ray Observatory will have the necessary capabilities to deliver the necessary measurements. We also discuss the evolution of the turbulent velocity distribution of the cluster in response to the action of radio galaxies and how it might be used as a probe in studying feedback.
DOI：
10.1086/591228
发表时间：
2008-06
期刊：
The Astrophysical Journal
影响因子：
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作者：
E. Scannapieco;M. Brüggen
通讯作者：
E. Scannapieco;M. Brüggen