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Astron. Astrophys. 330, 412-418 (1998)

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5. Conclusions

Two-dimensional velocity fields of stars and ionized gas in central parts of polar-ring galaxies NGC 2685 and IC 1689 are investigated with the Multi-Pupil Field Spectrograph of the 6m telescope. Rotation axes of stars and ionized gas have appeared to be roughly orthogonal in both cases. But if NGC 2685 seems to be surely an edge-on disk galaxy with the polar gaseous disk penetrating into the center, the other polar-ring galaxy, IC 1689, demonstrates a set of velocity-field properties which allow to suspect a presence of tumbling triaxial structure. In both galaxies chemically decoupled stellar nuclei are found; in IC 1689 the decoupled nucleus may also be much younger than the innermost bulge. This finding confirms the hypothesis of an origin of decoupled nuclei in secondary star formation bursts provoked by accretion of a significant gas mass.

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© European Southern Observatory (ESO) 1998

Online publication: January 16, 1998