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arXiv 0910.5091astro-ph.COastro-ph.HE
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校准群集中的AGN反馈

Calibrating AGN Feedback in Clusters

M. W. Wise

摘要:

无论是由活动星系核喷流、冲击还是合并引起的,星系团核心加热的最明确证据来自X射线光谱学。不幸的是,这种光谱基本上仅限于研究整个星系团的发射光谱。然而,由于相同的底层发射测量分布产生所观察到的CCD和RGS光谱,X射线成像仍然可以提供关于加热过程的空间信息。使用钱德拉档案数据的样本9集群,我们演示了如何成像数据可以用来约束偏离一个典型的,等压冷却流模型作为一个函数的位置在一个给定的集群。这一分析的结果也显示了英仙座星系团的深层档案曝光。这种加热图可以提供对簇的核心中加热的位置和幅度的约束。当与低频无线电观测的探测和光谱指数图相结合时,这些图可用于区分这些物体的不同加热模型。

英文摘要:

Whether caused by AGN jets, shocks, or mergers, the most definitive evidence for heating in cluster cores comes from X-ray spectroscopy. Unfortunately such spectra are essentially limited to studying the emission spectrum from the cluster as a whole. However since the same underlying emission measure distribution produces both the observed CCD and RGS spectra, X-ray imaging can still provide spatial information on the heating process. Using Chandra archival data for a sample of 9 clusters, we demonstrate how imaging data can be used to constrain departures from a canonical, isobaric cooling flow model as a function of position in a given cluster. The results of this analysis are also shown for the deep archival exposure of the Perseus cluster. Such heating maps can provide constraints on both the location and magnitude of the heating in the cores of clusters. When combined with detections and spectral index maps from low-frequency radio observations, these maps can be used to distinguish between different models for heating in these objects.

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