On the Heating of Cluster Cooling Flows by Sound Waves
On the Heating of Cluster Cooling Flows by Sound Waves
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DOI：
10.1086/491649
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发表时间：
2005-08
期刊：
影响因子：
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通讯作者：
Y. Fujita;T. Suzuki
中科院分区：
文献类型：
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作者：
Y. Fujita;T. Suzuki
我们研究了由中心活动星系核激发的声波的耗散对星系团冷核的加热。利用弱激波理论，我们证明单靠这种加热机制无法再现观测到的星团温度和密度分布，因为波的耗散长度远小于核心的大小，因此波能不会分布到整个核心。然而，我们发现，如果结合来自星团热外层的热传导，波加热可以再现观测结果。
We investigate heating of the cool core of a galaxy cluster through the dissipation of sound waves excited by the activity of the central active galactic nucleus. Using a weak-shock theory, we show that this heating mechanism alone cannot reproduce the observed temperature and density profiles of a cluster, because the dissipation length of the waves is much smaller than the size of the core, and thus the wave energy is not distributed to the whole core. However, we find that if it is combined with thermal conduction from the hot outer layer of the cluster, wave heating can reproduce the observational results.