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arXiv 1206.6067astro-ph.CO
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Abell 1835维里半径的Chandra X射线观测

Chandra X-ray observations of Abell 1835 to the virial radius

M. Bonamente, D. Landry, B. Maughan, P. Giles, M. Joy, J. Nevalainen

摘要:

我们报告的第一个钱德拉检测到的发射的维里半径在集群阿贝尔1835在z=0.253。我们的软X射线表面亮度的分析表明,目前的放射出的径向距离为10弧分或2.4兆秒差距,和温度分布有一个因素的10下降,从峰值温度为10千电子伏的值在维里半径。我们的模型的钱德拉数据从核心维里半径和陡峭的温度分布是不兼容的流体静力平衡的热气体,气体对流不稳定的郊区。钱德拉数据的一个可能的解释是,在星系团的维里半径附近存在着第二相的温热气体,它与星系团的势能不处于流体静力平衡。观测结果也与另一种情况相一致,即气体在大半径处明显聚集。

英文摘要:

We report the first Chandra detection of emission out to the virial radius in the cluster Abell 1835 at z=0.253. Our analysis of the soft X-ray surface brightness shows that emission is present out to a radial distance of 10 arcmin or 2.4 Mpc, and the temperature profile has a factor of ten drop from the peak temperature of 10 keV to the value at the virial radius. We model the Chandra data from the core to the virial radius and show that the steep temperature profile is not compatible with hydrostatic equilibrium of the hot gas, and that the gas is convectively unstable at the outskirts. A possible interpretation of the Chandra data is the presence of a second phase of warm-hot gas near the cluster's virial radius that is not in hydrostatic equilibrium with the cluster's potential. The observations are also consistent with an alternative scenario in which the gas is significantly clumped at large radii.

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