Nature of Nuclear Rings in Unbarred Galaxies: NGC 7742 and NGC 7217статья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have studied the unbarred Sb galaxy with a nuclear star-forming
ring, NGC 7742, by means of 2D spectroscopy, long-slit spectroscopy,
and imaging, and have compared the results with the properties of another
galaxy of this type, NGC 7217, which is studied by us earlier. Both galaxies
have many peculiar features in common: each has two global exponential
stellar disks with different scalelengths, each possesses a circumnuclear
inclined gaseous disk with a radius of 300 pc, and each has a global
counterrotating subsystem, gaseous one in NGC 7742 and stellar one in NGC 7217.
We suggest that past minor merger is the probable cause of all these
peculiarities, including appearance of the nuclear star-forming rings without
global bars; the rings might be produced as resonance features by tidally
induced oval distortions of the global stellar disks.