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arXiv 0909.2252astro-ph.GAastro-ph.CO
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富含金属气体沿水螅A射电喷流流出的直接证据

Direct Evidence for Outflow of Metal-enriched Gas Along the Radio Jets of Hydra A

C. C. Kirkpatrick, M. Gitti, K. W. Cavagnolo, B. R. McNamara, L. P. David, P. E. J. Nulsen, M. W. Wise

摘要:

使用深钱德拉观测的长蛇座A星系团,我们研究的金属丰度结构附近的中央星系和沿其强大的无线电源。我们发现,金属丰度的集群内介质的增强了高达0.2德克斯沿无线电射流和叶相比,金属丰度的未受干扰的气体。增强从中心星系20 kpc的半径延伸到~ 120 kpc的距离。我们估计,从中央星系中输送出来的总铁质量在2 x 10^7 M_sun和7 x 10^7 M_sun之间,占中央星系中铁质量的10% - 20%。提升这些气体所需的能量大约是活动星系核总能量输出的1%到5%。显然,九头蛇A强大的射电源能够重新分配富含金属的低熵气体,遍布星系团的核心。短的再富集时间尺度< 10^9年意味着从中央星系损失的金属将很快得到补充。

英文摘要:

Using deep Chandra observations of the Hydra A galaxy cluster, we examine the metallicity structure near the central galaxy and along its powerful radio source. We show that the metallicity of the intracluster medium is enhanced by up to 0.2 dex along the radio jets and lobes compared to the metallicity of the undisturbed gas. The enhancements extend from a radius of 20 kpc from the central galaxy to a distance of ~ 120 kpc. We estimate the total iron mass that has been transported out of the central galaxy to be between 2 x 10^7 M_sun and 7 x 10^7 M_sun which represents 10% - 20% of the iron mass within the central galaxy. The energy required to lift this gas is roughly 1% to 5% of the total energetic output of the AGN. Evidently, Hydra A's powerful radio source is able to redistribute metal-enriched, low entropy gas throughout the core of the galaxy cluster. The short re-enrichment time scale < 10^9 yr implies that the metals lost from the central galaxy will be quickly replenished.

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