Lopsided Satellite Distributions around Isolated Host Galaxies
Lopsided Satellite Distributions around Isolated Host Galaxies
复制标题
孤立主星系周围不平衡的卫星分布
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Adam Samuels
中科院分区：
文献类型：
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作者：
T. Brainerd;Adam Samuels
我们调查明亮的，孤立的宿主星系的卫星的空间分布。与以前的研究一致，我们发现，平均而言，红色主机的卫星被发现优先接近其主机的主轴，而蓝色主机的卫星是各向同性分布。我们计算卫星的成对聚类，并发现一个强烈的趋势，卫星对位于其主机的同一侧，导致不平衡的空间分布。这种信号在蓝色宿主的卫星上最为明显，在其宿主的同一侧上的对的数量超过其宿主的相对两侧上的对的数量1.8 ± 0.1倍。对于红色宿主的卫星，其宿主同一侧的对数量超过其宿主相对两侧的对数量，其系数为1.08 ± 0.03。远离宿主的卫星（r p = 300 kpc）对位于宿主的同一侧表现出强烈的偏好;靠近宿主的卫星（r p = 100 kpc）对位于宿主的相对两侧表现出微弱的偏好。虽然不平衡的分布已经发现以前的卫星明亮的星系对，我们的研究是第一次发现不平衡的分布孤立的明亮星系的卫星。
We investigate the spatial distribution of the satellites of bright, isolated host galaxies. In agreement with previous studies, we find that, on average, the satellites of red hosts are found preferentially close to their hosts’ major axes, while the satellites of blue hosts are distributed isotropically. We compute the pairwise clustering of the satellites and find a strong tendency for pairs of satellites to be located on the same side of their host, resulting in lopsided spatial distributions. The signal is most pronounced for the satellites of blue hosts, where the number of pairs on the same side of their host exceeds the number of pairs on opposite sides of their host by a factor of 1.8 ± 0.1. For the satellites of red hosts, the number of pairs on the same side of their host exceeds the number of pairs on opposite sides of their host by a factor of 1.08 ± 0.03. Satellites that are far from their hosts (r p ≳ 300 kpc) show a strong preference for being located on the same side of their hosts; satellites that are near to their hosts (r p ≲ 100 kpc) show a weak preference for being located on opposite sides of their hosts. While lopsided distributions have been found previously for the satellites of bright pairs of galaxies, ours is the first study to find lopsided distributions for the satellites of isolated bright galaxies.