标题： 超空洞的结构--I: 北部局部超空洞中的空洞层次结构 显示英文标题

标题： The Structure of Supervoids -- I: Void Hierarchy in the Northern Local Supervoid

摘要： 超空洞是局部宇宙中不包含丰富星系团的区域。我们研究了最近的例子，即位于本星系、后发座和武仙座超星系团之间的北本空洞。我们发现这个超空洞并不是空的，而是包含小型星系系统和贫瘠的星系团。我们通过分析贫瘠星系团、椭圆星系及其他星系在两个投影中的分布来研究这一空洞的宇宙学。我们列出了一份由不同形态类型和光度星系定义的空洞目录，并分析了不同环境中空洞的平均直径。空洞的大小和空洞壁的性质有关。由贫瘠星系团和明亮椭圆星系定义的空洞平均直径可达40 h^-1 Mpc。微弱的晚型星系将这些空洞分割成更小的空洞。我们所能研究的最微弱的星系正描绘出平均直径约为8 h^-1 Mpc的空洞。位于高密度环境中的空洞比低密度区域中的空洞要小。这一分析表明空洞形成一个分层系统。 显示英文摘要

摘要： Supervoids are regions in the local Universe which do not contain rich clusters of galaxies. We have studied the closest example, the Northern Local Void, situated between the Local, Coma, and the Hercules superclusters. We find that this supervoid is not empty, but it contains small galaxy systems and poor clusters of galaxies. We study the cosmography of this void by analyzing the distribution of poor clusters of galaxies, elliptical and other galaxies in two projections. We present a catalogue of voids, defined by galaxies of different morphological type and luminosity, and analyze mean diameters of voids in different environments. The sizes of voids and the properties of void walls are related. Voids defined by poor clusters of galaxies and by bright elliptical galaxies have a mean diameter of up to 40 h-1 Mpc. Faint late-type galaxies divide these voids into smaller voids. The faintest galaxies we can study are outlining voids with mean diameters of about 8 h-1 Mpc. Voids located in a high-density environment are smaller than voids in low-density regions. This analysis shows that voids form a hierarchical system.