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Дата последнего поиска статьи во внешних источниках: 20 мая 2014 г.
Аннотация:Lenticular galaxies are a morphological class of disc galaxies that in general lacks current star formation and extended gaseous discs. However recent UV surveys have revealed XUV (eXtended UV) discs and rings even among these `red and dead' galaxies, and their origin is now still unclear. Perhaps, their appearance may be related to the morphological shaping of S0 galaxies as a result of minor merging. We have studied the nature of the outer starforming, UV-detected rings in four unbarred S0 galaxies by undertaking their long-slit spectroscopy with the focal reducer SCORPIO of the Russian 6m telescope. Gaseous discs in NGC 252 and in NGC 4513 have decoupled kinematics, and the ionized gas of their rings is certainly excited by young stars. Just these two galaxies belong to galaxy groups. Two other, quite isolated S0 galaxies with the UV-rings, IC 522 and NGC 446, demonstrate the ring emission-line gas excitation dominated by shock waves, so their rings may probably have impact origin. However, in all four galaxies the ionized gas reveals the oxygen abundance close to the solar one.