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arXiv 1004.3749astro-ph.CO
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探索星系团郊区的天体物理学

Probing the Astrophysics of Cluster Outskirts

A. Lapi, R. Fusco-Femiano, A. Cavaliere

摘要:

在星系团中,团内等离子体的熵分布调节了后者在暗物质引力阱中的平衡,正如我们的超级模型所呈现的那样。我们认为,在边界激波的熵产生减少或终止的吸积率DM和星系间气体逐渐消失,这种行为是由在郊区的发展在后期的放缓,当暗能量主导宇宙学,而初始扰动的外翼驱动的增长。在这样的条件下,我们预测的ICP温度分布陡峭到集群的郊区。从我们简单的形式主义的详细的期望同意与X射线数据有关的五个集群的温度分布最近已被测量出维里半径。我们预测陡峭的温度下降,普遍存在于集群在低红移,回火只有丰富的环境,包括邻近的沉积结构。

英文摘要:

In galaxy clusters the entropy distribution of the IntraCluster Plasma modulates the latter's equilibrium within the Dark Matter gravitational wells, as rendered by our Supermodel. We argue the entropy production at the boundary shocks to be reduced or terminated as the accretion rates of DM and intergalactic gas peter out; this behavior is enforced by the slowdown in the outskirt development at late times, when the Dark Energy dominates the cosmology while the outer wings of the initial perturbation drive the growth. In such conditions, we predict the ICP temperature profiles to steepen into the cluster outskirts. The detailed expectations from our simple formalism agree with the X-ray data concerning five clusters whose temperature profiles have been recently measured out to the virial radius. We predict steep temperature declines to prevail in clusters at low redshift, tempered only by rich environs including adjacent filamentary structures.

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