两种极端合并情形下的标度关系
Scaling Rrelation in two situations of extreme mergers
摘要：
星系团是已知的动力学活跃系统，但X射线研究的低红移人口表现出严格的标度律。在这项工作中，我们扩展了以前的研究，这一明显的悖论使用数值模拟的两个极端的合并情况下，一个是高马赫数（2.5以上）的卫星合并类似的“子弹团”和其他合并的几乎相等的质量的祖先。创建X射线图像密集采样的时间，我们构建TX，Mgas和YX的措施在R500和比较Kravtsov等人的校准。（2006）。我们发现，这些极端的合并情况下尊重的尺度关系，为内在的措施和措施，来自适当掩盖，合成钱德拉X射线图像。掩蔽过程在X射线温度计算中起着关键作用，而在X射线气体质量推导中则无关紧要。高达100 kpc的对中误差不会影响结果。观测确定的半径R500可能有助于Mgas和Yx的系统偏移，这增加了总质量散射。
英文摘要：
Clusters of galaxies are known to be dynamically active systems, yet X-ray studies of the low redshift population exhibit tight scaling laws. In this work, we extend previous studies of this apparent paradox using numerical simulations of two extreme merger cases, one is a high Mach number (above 2.5) satellite merger similar to the "bullet cluster" and the other a merger of nearly equal mass progenitors. Creating X-ray images densely sampled in time, we construct TX, Mgas, and YX measures within R500 and compare to the calibrations of Kravtsov et al. (2006). We find that these extreme merger cases respect the scaling relations, for both intrinsic measures and for measures derived from appropriately masked, synthetic Chandra X-ray images. The masking procedure plays a critical role in the X-ray temperature calculation while it is irrelevant in the X-ray gas mass derivation. Mis-centering up to 100 kpc does not influence the result. The observationally determined radius R500 might conduce to systematic shifts in Mgas, and YX which increase the total mass scatter.
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