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Formation of Molecular Gas Rings in Galaxies: without Density Waves, Merging or Nuclear Activity

Published online by Cambridge University Press:  03 August 2017

H. Lesch ,
P.L. Biermann ,
H.P. Reuter  and
R Wielebinski
H. Lesch
Affiliation:
Landessternwarte Königstuhl 6900 Heidelberg, FRG
P.L. Biermann
Affiliation:
Max-Planck Institut für Radioastronomie Auf dem Hügel 69 5300 Bonn, FRG
H.P. Reuter
Affiliation:
Max-Planck Institut für Radioastronomie Auf dem Hügel 69 5300 Bonn, FRG
R Wielebinski
Affiliation:
Max-Planck Institut für Radioastronomie Auf dem Hügel 69 5300 Bonn, FRG

Extract

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Ringlike structures (in Hα, 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:

The typical mass of these rings is 108 − 109M⊙.

The gas distribution is smoothly decreasing from the ring into the innermost galactic regions. The rings appear always at the turnover radius where the galactic rotation turns from rigid to differential rotation.

Type
VIII- Bars, Rings and Starbursts
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 269 - 271
Copyright
Copyright © Kluwer 1991 

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