COMA星系团的研究3.维里质量和运动学分析

Studies on the COMA Cluster 3. Virial Mass and Kinematics

本文利用Kent和Gunn提供的COMA团天区414个星系的视向速度资料,以及关于团成员的统计判别结果,确定了COMA团的维里质量并就若干运动学问题进行了讨论,分析表明COMA团是一个经历了一定时间的动力学演化,然而尚未达到充分弛豫阶段的星系团。就现有观测资料来看,COMA团星系的质量分层效应并不显著。由大概率成员星系确定的COMA团维里质量为产μ_V=2.63×10^(15)μ_⊙,总光度L=1.45×10^(13)L_⊙,质光比μ_r/L=182,光度质量μ_L=3.43×10^(14)μ_⊙。

Using the list of redshifts for 414 galaxies in the region of the COMA Cluster compiled by Kent and Gunn, and the results of the statistical determination of membership of individual galaxies in the list, the virial mass of the COMA Cluster has been determined and some kinematical problems have been discussed in this paper. After careful analyses, it is shown that the COMA Cluster has already undergone a period of dynamical evolution, but has not yet reached the state of full relaxation. From the Study of the available observational data we find the mass segregation of the COMA Cluster is not significant. Calculations based on the data of member galaxies with high membership probabilities in the COMA Cluster show that its virial mass μr = 2.63× 1015μ. total luminosity L = 1.45 ×1013L, mass-luminosity ratio μr/L = 182μ/L , and luminosity mass μL -= 3.43 × 1014 .