Dynamical friction in modified Newtonian dynamics
Abstract
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.
Keywords
Cite
@article{arxiv.0802.1122,
title = {Dynamical friction in modified Newtonian dynamics},
author = {C. Nipoti and L. Ciotti and J. Binney and P. Londrillo},
journal= {arXiv preprint arXiv:0802.1122},
year = {2009}
}
Comments
Accepted for publication in MNRAS. 6 pages, 3 figures. Corrected typo in eq. (8), added panel to Fig. 1, added references and discussion. Results unchanged