The non-uniformity of galaxy cluster metallicity profiles
The non-uniformity of galaxy cluster metallicity profiles
复制标题
星系团金属丰度分布的不均匀性
DOI：
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发表时间：
2018
影响因子：
4.8
通讯作者：
T. Reiprich
中科院分区：
文献类型：
--
作者：
L. Lovisari;T. Reiprich
我们研究了用XMM-牛顿观测到的207个邻近星系群和星系团的样本。此样本的关键方面包括大容量、高数据质量和集群动态状态的巨大多样性。我们测定了0.3R值范围内的总金属丰度和金属的径向分布。平均而言，我们发现核心金属丰度与系统的平均温度有轻微的依赖关系，这与以前的结果一致。然而，我们确定这种轻微依赖的原因仅仅是由于松弛的系统；平均而言，受干扰的系统不会表现出这种趋势。在这个关系中观察到的大散射与系统的动力学状态密切相关：松弛系统的核心平均具有比扰动物体更高的金属度。弛豫系统的径向分布呈中心尖峰，并随半径的增大而急剧减小，在0.3-0.4R$_(500)$范围内变平。扰动系统的金属丰度在中心也较高，但远低于观察到的松弛物体的金属丰度。这一发现与星系团合并通过引发大尺度运动来混合丰度分布的图景是一致的。径向分布的散射量很大，但对于松弛系统，它几乎单调地随着半径的变化而减小，而对于扰动系统，它在大半径时表现出显著的促进作用。具有中央射电源的系统具有更平坦的轮廓，这表明中央活动星系核是一种有效的机制来抬升和重新分配ICM中的金属。
We study a sample of 207 nearby galaxy groups and clusters observed with XMM-Newton. Key aspects of this sample include the large size, the high data quality, and the large diversity of cluster dynamical states. We determine the overall metallicity within 0.3R$_{500}$ and the radial distribution of the metals. On average, we find a mild dependence of the core metallicity with the average temperature of the system in agreement with previous results. However, we identify the cause of this mild dependence to be due to relaxed systems only; disturbed systems do not show this trend, on average. The large scatter observed in this relation is strongly associated with the dynamical state of the systems: relaxed systems have on average a higher metallicity in the core than disturbed objects. The radial profiles of relaxed systems are centrally peaked and show a steep decrease with radius, flattening beyond 0.3-0.4R$_{500}$. The metallicity of disturbed systems is also higher in the center but at much lower values than what is observed for relaxed objects. This finding is consistent with the picture that cluster mergers mix the abundance distribution by inducing large scale motions. The scatter of the radial profiles is quite large, but while for relaxed systems it decreases almost monotonically as function of the radius, for disturbed systems it shows a significant boost at large radii. Systems with a central radio source have a flatter profile indicating that central AGNs are an efficient mechanism to uplift and redistribute the metals in the ICM.
影响因子：
6.5
作者：
F. Mernier;J. Plaa;J. Kaastra;Yu-ying Zhang;H. Akamatsu;L. Gu;P. Kosec;J. Mao;C. Pinto;T. Reiprich;J. Sanders;A. Simionescu;N. Werner
通讯作者：
F. Mernier;J. Plaa;J. Kaastra;Yu-ying Zhang;H. Akamatsu;L. Gu;P. Kosec;J. Mao;C. Pinto;T. Reiprich;J. Sanders;A. Simionescu;N. Werner
影响因子：
6.5
作者：
Sophia Thölken;L. Lovisari;L. Lovisari;T. Reiprich;J. Hasenbusch
通讯作者：
Sophia Thölken;L. Lovisari;L. Lovisari;T. Reiprich;J. Hasenbusch
影响因子：
6.5
作者：
A. Simionescu;N. Werner;H. Böhringer;J. Kaastra;A. Finoguenov;M. Brüggen;P. Nulsen
通讯作者：
A. Simionescu;N. Werner;H. Böhringer;J. Kaastra;A. Finoguenov;M. Brüggen;P. Nulsen