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Two Double Galaxy Systems

Published online by Cambridge University Press:  25 April 2016

B. M. Lewis
B. M. Lewis*
Affiliation:
Mount Stromlo and Siding Spring Observatories, Australian National University, Canberra
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Extract

It is generally assumed from an inspection of prints of non-magellanic spiral galaxies that all constituents, including the HI, are distributed with a large-scale circular symmetry in the plane of the galaxy. This assumption is supported by the expectation that any primordial asymmetry in the mass distribution would have disintegrated by the present epoch under the shearing effects of differential rotation into an approximately circularly symmetric ring. It is therefore surprising to find that the recent high-resolution studies of M 31, M 101, NGC 300 and our own galaxy all show that the HI centroid is significantly displaced from the nucleus. This is a sign that the HI distribution is markedly asymmetric.

Type
Contributions
Information
Publications of the Astronomical Society of Australia , Volume 1 , Issue 6 , September 1969 , pp. 288 - 289
Copyright
Copyright © Astronomical Society of Australia 1969

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References

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