【摘要】 本文对Ｖｉｒｇｏ星系团中央６°天区内的成员星系作了光度函数和质量函数的研究。成员星系是以视向速度作为判据并合理地考虑了密度分布因素后确定的。研究表明，该天区全部成员星系的光度函数为Ｓｃｈｅｃｈｔｅｒ型，而各类Ｓ星系的光度函数则为Ｇａｕｓｓ型，且峰值位置按Ｓａ→Ｓｄ序列向暗端移动，宽度亦逐渐变宽；Ｖｉｒｇｏ团质量函数与恒星质量函数一样可以用指数形式来描述，文中还利用光度函数和质量函数对该团的形态和质量分层进行了讨论，并计算了该天区团的总光度。更多还原

【Abstract】 Studies of the luminosity function and mass function in the central 6 degree region of the Virgo cluster are presented. We take radial velocities of galaxies as a criterion, reasonably consider their space distribution, and determine members of the cluster. It is shown that the luminosity function in this region is of Schechter type for all members, Gaussian for the S-type galaxies, where the positions of the peaks seem to move to the faint end and the widths increase along the sequence Sa→Sd. The mass function of the cluster can be well described using a power law just the same as that of stars. Mass and morphology segregation are discussed on the basis of luminosity function and mass function.The total luminosity in this region of the cluster is also presented.更多还原