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This third paper in a series about the dwarf galaxy populations in groupswithin the Local Supercluster concerns the intermediate mass (2.1 x 10^13solar) NGC 5353/4 Group with a core dominated by S0 systems and a periphery ofmostly spiral systems. Dwarf galaxies are strongly concentrated toward thecore. The mass to light ratio M/L_R=105 in solar units is a factor 3 lower thanfor the two groups studied earlier in the series. The properties of the groupsuggest it is much less dynamically evolved than those two groups of early typegalaxies. By comparison, the NGC 5353/4 Group lacks superluminous systems buthas a large fraction of intermediate luminosity galaxies; or equivalently, aluminosity function with a flatter faint end slope. The luminosity function forthe NGC 5353/4 Group should steepen as the intermediate luminosity galaxiesmerge. Evidence for the ongoing collapse of the group is provided by theunusually large incidence of star formation activity in small galaxies withearly morphological types. The pattern in the distribution of galaxies withactivity suggests a succession of infall events. Residual gas in dwarfs thatenter the group is used up in sputtering events. The resolution of midlifecrises is exhaustion.

Midlife Crises in Dwarf Galaxies in the NGC 5353/4 Group