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Date and Time of the Query: 2019-04-24 T23:17:19 PDT
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For refcode 2008AJ....135.1488T:
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Copyright by American Astronomical Society. Reproduced by permission
2008AJ....135.1488T MIDLIFE CRISES IN DWARF GALAXIES IN THE NGC 5353/4 GROUP R. Brent Tully and Neil Trentham ABSTRACT. 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^ M sun) 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 M sun/L sun is a factor of 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. Key words: galaxies: clusters: individual: NGC 5353/4, galaxies: dwarf, galaxies: luminosity function, mass function, galaxies: photometry, galaxies: starburst
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