Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-07
Astrophys.J.512:L17,1999
Astronomy and Astrophysics
Astrophysics
Latex, five pages, final version to be published in Astrophys. J. Lett
Scientific paper
10.1086/311871
We have recently discovered that the modified dynamics (MOND) implies some universal upper bound on the acceleration that can be contributed by a `dark halo'--assumed in a Newtonian analysis to account for the effects of MOND. Not surprisingly, the limit is of the order of the acceleration constant of the theory. This can be contrasted directly with the results of structure-formation simulations. The new limit is substantial and different from earlier MOND acceleration limits (discussed in connection with the MOND explanation of the Freeman law for galaxy disks, and the Fish law for ellipticals): It pertains to the `halo', and not to the observed galaxy; it is absolute, and independent of further physical assumptions on the nature of the galactic system; and it applies at all radii, whereas the other limits apply only to the mean acceleration in the system.
Brada Rafael
Milgrom Mordehai
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