NGC 5353/4组矮星系的中年危机
Midlife Crises in Dwarf Galaxies in the NGC 5353/4 Group
摘要：
这是关于本超星系团中矮星系群的系列论文的第三篇，涉及中等质量（2.1 x 10^13太阳）的NGC 5353/4星系群，其核心主要是S 0系统，外围主要是螺旋系统。矮星系强烈地向核心集中。在太阳单位中的质光比M/L_R=105比系列中前面研究的两组低3倍。该星系群的性质表明，它的动态演化比这两组早期类型星系要少得多。相比之下，NGC 5353/4星系群缺乏超亮系统，但有很大一部分中等光度星系;或者说，光度函数有一个更平坦的暗端斜率。NGC 5353/4星系群的光度函数应该随着中间光度星系的合并而变陡。早期形态类型的小星系中异常大的恒星形成活动事件提供了该集团正在进行的坍缩的证据。活动星系的分布模式暗示着一系列的坠落事件。进入群的矮星中的残余气体在溅射事件中耗尽。中年危机的解决之道是精疲力竭。
英文摘要：
This third paper in a series about the dwarf galaxy populations in groups within the Local Supercluster concerns the intermediate mass (2.1 x 10^13 solar) NGC 5353/4 Group with a core dominated by S0 systems and a periphery of mostly spiral systems. Dwarf galaxies are strongly concentrated toward the core. The mass to light ratio M/L_R=105 in solar units is a factor 3 lower than for the two groups studied earlier in the series. The properties of the group suggest it is much less dynamically evolved than those two groups of early type galaxies. By comparison, the NGC 5353/4 Group lacks superluminous systems but has a large fraction of intermediate luminosity galaxies; or equivalently, a luminosity function with a flatter faint end slope. The luminosity function for the NGC 5353/4 Group should steepen as the intermediate luminosity galaxies merge. Evidence for the ongoing collapse of the group is provided by the unusually large incidence of star formation activity in small galaxies with early morphological types. The pattern in the distribution of galaxies with activity suggests a succession of infall events. Residual gas in dwarfs that enter the group is used up in sputtering events. The resolution of midlife crises is exhaustion.
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