SCALING RELATION IN TWO SITUATIONS OF EXTREME MERGERS
SCALING RELATION IN TWO SITUATIONS OF EXTREME MERGERS
复制标题
两种极端合并情况下的规模关系
DOI：
10.1088/0004-637x/729/1/45
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Meneghetti
中科院分区：
文献类型：
--
作者：
E. Rasia;P. Mazzotta;A. Evrard;M. Markevitch;K. Dolag;M. Meneghetti
众所周知，星系团是动态活跃的系统，然而对低红移星系团的x射线研究显示出严格的标度定律。在这项工作中，我们使用两个极端合并案例的数值模拟扩展了先前对这一明显悖论的研究，一个是类似于“子弹星团”的高马赫数（高于2.5）卫星合并，另一个是几乎相等质量的祖星系合并。创建实时密集采样的x射线图像，我们在R500内构建TX， Mgas和YX测量，并与Kravtsov等人的校准进行比较。我们发现这些极端的合并情况尊重尺度关系，无论是固有的措施和措施得到适当掩盖，合成钱德拉x射线图像。遮蔽过程在x射线温度计算中起着至关重要的作用，而在x射线气体质量推导中则无关紧要。误差高达100kpc不会影响结果。观测确定的半径R500可能导致Mgas和YX的系统位移，这增加了总质量散射。
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 is 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. 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. Miscentering up to 100 kpc does not influence the result. The observationally determined radius R500 might conduce to systematic shifts in Mgas and YX, which increases the total mass scatter.
DOI：
10.1111/j.1365-2966.2009.15034.x
发表时间：
2008-08
影响因子：
4.8
作者：
K. Dolag;S. Borgani;S. Borgani;S. Borgani;G. Murante;V. Springel
通讯作者：
K. Dolag;S. Borgani;S. Borgani;S. Borgani;G. Murante;V. Springel