Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-04-03
Astronomy and Astrophysics
Astrophysics
Accepted for publication in MNRAS. 8 pages, 8 figures
Scientific paper
10.1046/j.1365-8711.1998.01616.x
We present circumstantial evidence that the central region of the edge-on S0 galaxy NGC 4570, which harbors a 150 pc scale nuclear disc in addition to its main outer disc, has been shaped under the influence of a small (approx. 500pc) bar. This is based on the finding of two edge-on rings, whose locations are consistent with the Inner Lindblad and Ultra Harmonic Resonances of a rapidly tumbling triaxial potential. Observed features in the photometry and rotation curve nicely correspond with the positions of the main resonances, strengthening the case for a tumbling bar potential. The relative blue colour of the ILR ring, and the complete absence of any detected ISM, indicates that the nuclear ring is made of relatively young (< 2 Gyr) stars. We discuss a possible secular-evolution scenario for this complex multi-component galaxy, which may also apply to many other S0-galaxies with observed rings and/or multiple disc-components.
Emsellem Eric
van den Bosch Frank C.
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