Abstract
Rotation curves of our Galaxy, M31 and M81 have a deep minimum atR=1–4 kpc. It is demonstrated that this minimum can be dynamically explained if the stellar disks of these galaxies have no representatives in the central region. Such a ring-like distribution of matter in stellar disks is suggested by the similarity observed in the distribution of extreme Population I objects if we assume that a stellar disk was formed from a gaseous disk which always had a ring-like structure.
The presence of central holes in disks of spiral galaxies suggests that during the initial collapse phase almost all protogalactic gas with a low angular momentum has been consumed to form the spheroidal component. No low-momentum gas was left over to form central parts of stellar disks.
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Einasto, J., Tenjes, P., Barabanov, A.V. et al. Central holes in disks of spiral galaxies. Astrophys Space Sci 67, 31–43 (1980). https://doi.org/10.1007/BF00651866
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DOI: https://doi.org/10.1007/BF00651866