论文标题
准球形超级克鲁斯特人
Quasi-spherical superclusters
论文作者
论文摘要
通常，超级克鲁斯特人的动态状态鲜为人知。我们研究超级散布器的特性，并选择一个准球形超级分类器的样本，可以使用$λ$的意义图研究其动力学。我们从Sloan数字天空调查数据7（SDSS DR7）数据中使用自适应局部阈值密度方法提取了超集群样品，并使用成员星系和组的动力质量估算了它们的质量。我们使用了基于Minkowski功能的拓扑分析以及超级群体中星系和星系组的位置。最后，我们强调了使用$λ$“意义”图在本研究中发现的几种非凡类型的超级集体类型的动态状态。我们的最终样本包含130至450 MPC的距离范围内的65个超级集体。超集群质量介于$ 1.1 \ times 10^{15} m _ {\ sun} $和$ 1.4 \ times 10^{16} m _ {\ sun} $和25 MPC和87 MPC之间我们发现，薄煎饼超级推动者形成了超级流行器的低亮度，小，贫穷和低质量端。我们发现四个不寻常类型的超级散布器，表现出异常的球形形状。这些所谓的准球形系统包含一个被相对球形密度和星系分布所包围的高密度核心。这些准球形的质量比比其他超级流行器的质量比高，表明暗物质相对较高。使用$λ$的意义图，用于扁平和扁平的球体，我们发现三个准球形超级clus子在当前时期在重力上是重力结合的。准球形超级推动器是迄今为止发现的最大的重力系统之一，并形成了一类特殊的巨型系统，这些系统动态地在大型重力无结合的超级clus子和平衡构型的星系群之间。
Generally the dynamical state of superclusters is poorly known. We study properties of superclusters and select a sample of quasi-spherical superclusters, the dynamics of which can be studied using the $Λ$ significance diagram. We extracted our supercluster sample with an adaptive local threshold density method from the Sloan Digital Sky Survey Data Release 7 (SDSS DR7) data and estimated their masses using the dynamical masses for member galaxies and groups. We used topological analysis based on Minkowski functionals and the positions of galaxies and galaxy groups in superclusters. Finally, we highlight the dynamical state of a few exceptional types of superclusters found in this study using the $Λ$ significance diagram. Our final sample contains 65 superclusters in the distance range of 130 to 450 Mpc. Supercluster masses range between $1.1 \times 10^{15} M_{\sun}$ and $1.4 \times 10^{16} M_{\sun}$ and sizes between 25 Mpc and 87 Mpc. We find that pancake-type superclusters form the low-luminosity, small, poor and low-mass end of superclusters. We find four superclusters of unusual types, exhibiting exceptionally spherical shapes. These so-called quasi-spherical systems contain a high-density core surrounded by a relatively spherical density and galaxy distribution.The mass-to-light ratio of these quasi-sphericals is higher than those of the other superclusters, suggesting a relatively high dark matter content. Using the $Λ$ significance diagram for oblate and prolate spheroids, we find that three quasi-spherical superclusters are gravitationally bound at the present epoch. Quasi-spherical superclusters are among the largest gravitationally bound systems found to date, and form a special class of giant systems that, dynamically, are in between large gravitationally unbound superclusters and clusters of galaxies in an equilibrium configuration.
