Abstract
Ringlike structures (in H α, CO and radio continuum) in central galactic regions have been observed in a number of objects. They seem to be a basic feature of galactic structure (for references see Dickman et al., 1988). These observations can be summarized as follows:
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The typical mass of these rings is 108 – 109 M ⊙.
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The gas distribution is smoothly decreasing from the ring into the innermost galactic regions.
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The rings appear always at the turnover radius where the galactic rotation turns from rigid to differential rotation.
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Lesch, H., Biermann, P.L., Reuter, H.P., Wielebinski, R. (1990). Ring Formation in Viscous Differentially Rotating Galactic Disks. In: Wielen, R. (eds) Dynamics and Interactions of Galaxies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-75273-5_83
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DOI: https://doi.org/10.1007/978-3-642-75273-5_83
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