Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-12-16
Astron.J.131:1336-1346,2006
Astronomy and Astrophysics
Astrophysics
Accepted to AJ, 11 PS/EPS figures (5 figures were added in color)
Scientific paper
10.1086/499945
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.
Moiseev Aleksei V.
Sil'chenko Olga K.
No associations
LandOfFree
Nature of nuclear rings in unbarred galaxies: NGC 7742 and NGC 7217 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Nature of nuclear rings in unbarred galaxies: NGC 7742 and NGC 7217, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Nature of nuclear rings in unbarred galaxies: NGC 7742 and NGC 7217 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-111606