Dynamical friction in modified Newtonian dynamics

Details Dynamical friction in modified Newtonian dynamics Dynamical friction in modified Newtonian dynamics

2008-02-08

arxiv.org/abs/0802.1122v2

Astronomy and Astrophysics

Astrophysics

Accepted for publication in MNRAS. 6 pages, 3 figures. Corrected typo in eq. (8), added panel to Fig. 1, added references and

Scientific paper

10.1111/j.1365-2966.2008.13192.x

We have tested a previous analytical estimate of the dynamical friction timescale in Modified Newtonian Dynamics (MOND) with fully non-linear N-body simulations. The simulations confirm that the dynamical friction timescale is significantly shorter in MOND than in equivalent Newtonian systems, i.e. systems with the same phase-space distribution of baryons and additional dark matter. An apparent conflict between this result and the long timescales determined for bars to slow and mergers to be completed in previous N-body simulations of MOND systems is explained. The confirmation of the short dynamical-friction timescale in MOND underlines the challenge that the Fornax dwarf spheroidal poses to the viability of MOND.

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