Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980rspta.296..313g&link_type=abstract
(Royal Society, Discussion on the Origin and Early Evolution of the Galaxies, London, England, Feb. 14, 15, 1979.) Royal Society
Astronomy and Astrophysics
Astrophysics
12
Astronomical Models, Big Bang Cosmology, Galactic Evolution, Interstellar Matter, Missing Mass (Astrophysics), Elliptical Galaxies, Halos, Milky Way Galaxy, Spiral Galaxies
Scientific paper
Since optical tracers and neutral hydrogen do not extend to very large radii, the total masses of galaxies cannot be ascertained but are in any case considerably larger than was commonly supposed a few years ago. Evidence that a great deal of invisible mass is associated with galaxies comes of course from considering binary galaxies and groups of galaxies. The paper reviews the observational situation about the existence of dark matter in the outer part of galaxies. Both observation and simple theory suggest that the dark matter is probably bound to galaxies, and that it is present around both spirals and ellipticals. Recent evidence on the rotation curve of the Galaxy reveals that the halo-stuff distribution is roughly spherical on the basis of existing dynamical data on the nature of the halo material.
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