Journal Article

Forming galaxies with MOND

R. H. Sanders

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 3, pages 1588-1596
Published in print May 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13140.x
Forming galaxies with MOND

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Beginning with a simple model for the growth of structure, I consider the dissipationless evolution of a MOND-dominated region in an expanding universe by means of a spherically symmetric N-body code. I demonstrate that the final virialized objects resemble elliptical galaxies with well-defined relationships between the mass, radius and velocity dispersion. These calculations suggest that, in the context of MOND, massive elliptical galaxies may be formed early (z ≥ 10) as a result of monolithic dissipationless collapse. Then I reconsider the classic argument that a galaxy of stars results from cooling and fragmentation of a gas cloud on a time-scale shorter than that of dynamical collapse. Qualitatively, the results are similar to that of the traditional picture; moreover, the existence, in MOND, of a density–temperature relation for virialized, near isothermal objects as well as a mass–temperature relation implies that there is a definite limit to the mass of a gas cloud where this condition can be met – an upper limit corresponding to that of presently observed massive galaxies.

Keywords: gravitation; galaxies: formation; galaxies: fundamental parameters; dark matter

Journal Article.  7005 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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