论文标题
围绕孤立的宿主星系的卫星分布不平衡
Lopsided Satellite Distributions around Isolated Host Galaxies
论文作者
论文摘要
我们研究了明亮的，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，红色宿主的卫星优先靠近其宿主的主要轴，而蓝色宿主的卫星则是各向同性的。我们计算卫星的成对聚类，并发现将卫星对位于宿主的同一侧的强烈趋势，从而导致分布不平衡。该信号对于蓝色宿主的卫星最为明显，其中宿主的同一侧的对数超过其在其相对侧的对数1.8 +/- 0.1。对于红色宿主的卫星，其宿主同一侧的对数超过了宿主相对侧的对数1.08 +/- 0.03。远离其主机（R_P> 300 kpc）的卫星表现出强烈的偏爱，即位于主机的同一侧；接近其主机的卫星（R_P <100 kpc）表明，偏爱位于宿主的相对侧。虽然先前已经为明亮的星系对卫星找到了偏斜的分布，但我们的研究是第一个为孤立明亮星系的卫星找到偏斜分布的研究。
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 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 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.
