Dwarf satellite galaxies in the modified dynamics

Details Dwarf satellite galaxies in the modified dynamics Dwarf satellite galaxies in the modified dynamics

2000-05-09

arxiv.org/abs/astro-ph/0005194v2

Astronomy and Astrophysics

Astrophysics

15 pages with 5 embedded figures; Astrophysical J in press Corrected error in names of authors

Scientific paper

10.1086/309475

In the modified dynamics (MOND) the inner workings of dwarf satellites can be greatly affected by their mother galaxy-over and beyond its tidal effects. Because of MOND's nonlinearity a system's internal dynamics can be altered by an external field in which it is immersed (even when this field, by itself, is constant in space). As a result, the size and velocity dispersion of the satellite vary as the external field varies along its orbit. A notable outcome of this is a substantial increase in the dwarf's vulnerability to eventual tidal disruption-rather higher than Newtonian dynamics (with a dark-matter halo) would lead us to expect for a satellite with given observed parameters.

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