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arXiv 0909.1574astro-ph.CO
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AGN反馈对星系团观测量的影响

The Influence of AGN Feedback on Galaxy Cluster Observables

H. -Y. Yang, P. M. Ricker, P. M. Sutter

摘要:

星系团是有价值的宇宙学探测器。然而,星系团质量的估计依赖于可观测到的数量,这些数量受到星系团内介质(ICM)中复杂重子物理的影响,包括来自活动星系核(AGN)的反馈。宇宙学模拟已经开始包括AGN反馈使用次网格模型。为了做出稳健的预测,需要理解不同实现和参数化的系统性。我们在FLASH中建立了一个活动星系核亚网格模型,它支持几种不同的黑洞吸积模型和反馈模型。我们用这个模型来研究活动星系核对X射线星系团观测值的影响及其对模型变化的依赖性。

英文摘要:

Galaxy clusters are valuable cosmological probes. However, cluster mass estimates rely on observable quantities that are affected by complicated baryonic physics in the intracluster medium (ICM), including feedback from active galactic nuclei (AGN). Cosmological simulations have started to include AGN feedback using subgrid models. In order to make robust predictions, the systematics of different implementations and parametrizations need to be understood. We have developed an AGN subgrid model in FLASH that supports a few different black hole accretion models and feedback models. We use this model to study the effect of AGN on X-ray cluster observables and its dependence on model variations.

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