重建室女星系团的内禀三轴形状
Reconstructing the Intrinsic Triaxial Shape of the Virgo Cluster
摘要：
要用星系团作为宇宙学的探测器，解释它们的三轴性是很重要的。假设星系团的三轴形状是由潮汐与周围物质的相互作用引起的，Lee和Kang最近开发了一种用于测量三轴星系团轴比的重建算法。我们检查这个重建算法的有效性，通过执行一个观测测试，它与室女星系团作为目标。我们首先修改了LK06算法，加入了二维投影效应。然后，我们分析了室女星系团星表中的1275个成员星系，通过测量成员星系在二维投影平面上的空间分布的各向异性，找到了室女星系团长轴的投影方向。将改进的重建算法应用于分析数据，我们发现三轴室女星系团的轴比为（1：0.54：0.73）。这一结果与最近室女星系团巡天的观测报告一致，证明了重建算法的鲁棒性。它也被发现，在内径的形状往往是更像扁长形。我们讨论了室女星系团的三轴性对质量估计的可能影响。
英文摘要：
To use galaxy clusters as a cosmological probe, it is important to account for their triaxiality. Assuming that the triaxial shapes of galaxy clusters are induced by the tidal interaction with the surrounding matter, Lee and Kang recently developed a reconstruction algorithm for the measurement of the axial ratio of a triaxial cluster. We examine the validity of this reconstruction algorithm by performing an observational test of it with the Virgo cluster as a target. We first modify the LK06 algorithm by incorporating the two dimensional projection effect. Then, we analyze the 1275 member galaxies from the Virgo Cluster Catalogue and find the projected direction of the Virgo cluster major axis by measuring the anisotropy in the spatial distribution of the member galaxies in the two dimensional projected plane. Applying the modified reconstruction algorithm to the analyzed data, we find that the axial ratio of the triaxial Virgo cluster is (1: 0.54 : 0.73). This result is consistent with the recent observational report from the Virgo Cluster Survey, proving the robustness of the reconstruction algorithm. It is also found that at the inner radii the shape tends to be more like prolate. We discuss the possible effect of the Virgo cluster triaxiality on the mass estimation.
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