Journal Article

Dynamical friction in modified Newtonian dynamics

Carlo Nipoti, Luca Ciotti, James Binney and Pasquale Londrillo

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 386, issue 4, pages 2194-2198
Published in print June 2008 | ISSN: 0035-8711
Published online April 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13192.x
Dynamical friction in modified Newtonian dynamics

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We have tested a previous analytical estimate of the dynamical friction time-scale in modified Newtonian dynamics (MOND) with fully non-linear N-body simulations. The simulations confirm that the dynamical friction time-scale 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 time-scales 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 time-scale in MOND underlines the challenge that the Fornax dwarf spheroidal poses to the viability of MOND.

Keywords: gravitation; stellar dynamics; galaxies: kinematics and dynamics

Journal Article.  3472 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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