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Dynamical friction in modified Newtonian dynamics

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arxiv 0802.1122 v2 pith:2D76RZZZ submitted 2008-02-08 astro-ph

Dynamical friction in modified Newtonian dynamics

C. Nipoti (1) , L. Ciotti (1) , J. Binney (2) , P. Londrillo (3) ((1) Bologna University , (2) Oxford University , (3) INAF-Bologna Astronomical Observatory) This is my paper
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keywords monddynamicalfrictionnewtoniansimulationssystemstimescaledynamics
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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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