Stellar Nuclear Rings in Barred Galaxies: Fossils of Past Circumnuclear Starbursts?
We have found four barred S0 galaxies---NGC 936, NGC 3945, NGC 4340, and NGC 4371---which contain smooth, luminous, purely stellar nuclear rings within their bars. These rings have little or no dust, no evidence for recent star formation, and are approximately the same color as the surrounding bar and bulge. Thus, they are probably the aged
Erwin, Peter et al.
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2001