arXiv 0804.36072008-04astro-ph

从XMM-牛顿资料看A548的动力学状态：X射线和射电联系

The dynamical state of A548 from XMM-Newton data: X-ray and radio connection

L. Solovyeva, S. Anokhin, L. Feretti, J. L. Sauvageot, R. Teyssier, G. Giovannini, F. Govoni, D. Neumann

备注：: A&A, accepted March 20, 2008, (better quality of figures you can look in A&A after publication)
DOI：: 10.1051/0004-6361:200809445

摘要：

本文利用XMM-牛顿观测数据，对星系团Abell 548 b（z=0.04）的X射线性质进行了详细的研究，并讨论了该星系团的热性质与其外围存在的两个扩展遗迹射电源之间的关系。我们希望分析集群的动力学状态，并确认一个主要的合并的存在。我们将讨论合并对扩展非热辐射的影响。从温度分布和表面亮度剖面的分析，我们发现在北部星团区域的一个冲击的证据，就在两个扩展的周边遗迹的位置之前。从光学分析中，我们发现团星系显示出大的$σ_V$，并且需要两个分量来拟合它们的速度分布。观测结果进行了比较与集群模拟。模拟得到的气体温度和密度分布图在星系团合并接近垂直于天平面的情况下和在最大核坍缩后的状态下与观测数据一致。我们的结论是，我们正在观察一个星系团在一个主要的合并阶段，就在最大的核心崩溃。质量比约为1：2，合并碰撞几乎垂直于天空平面。在星系团的北部区域存在一个激波，它很可能是电子再加速和磁场放大的原因，从而导致了星系团遗迹的形成。投影效应强烈地影响着激波和遗迹的相对位置。

英文摘要：

We present a detailed study of the X-ray properties of the galaxy cluster Abell 548b (z=0.04), using XMM-Newton data, and discuss the connection between the thermal properties and the presence of two extended relic radio sources located at the cluster periphery. We wish to analyze the dynamical state of the cluster and confirm the presence of a major merger. We will discuss the merger effects on the extended nonthermal emission. From the analysis of the temperature distribution and of the surface brightness profiles, we find evidence of a shock in the northern cluster region, just before the location of the two extended peripheral relics. From the optical analysis, we find that the cluster galaxies show a large $σ_V$, and two components are needed to fit their velocity distribution. Observational results were compared with a cluster simulation. The maps of gas temperature and density distribution from the simulation agree with the observational data in the case of a cluster merger nearly perpendicular to the plane of the sky and in the state after the maximum core collapse. We conclude that we are observing a galaxy cluster in a major merger phase, just after the maximum core collapse. The mass ratio is about 1:2, and the merger collision is nearly perpendicular to the plane of the sky. A shock is present in the northern cluster region, and it is very likely responsible for the electron reacceleration and the magnetic field amplification that will give cause the cluster relics. The relative position of the shock and the relics is strongly affected by projection effects.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

摘要：

英文摘要：

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