Journal Article

MOND and the lensing fundamental plane: no need for dark matter on galaxy scales

R. H. Sanders and D. D. Land

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 2, pages 701-705
Published in print September 2008 | ISSN: 0035-8711
Published online September 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13378.x
MOND and the lensing fundamental plane: no need for dark matter on galaxy scales

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Bolton et al. have derived a mass-based fundamental plane using photometric and spectroscopic observations of 36 strong gravitational lenses. The lensing allows a direct determination of the mass-surface density and so avoids the usual dependence on mass-to-light ratio. We consider this same sample in the context of Modified Newtonian dynamics (MOND) and demonstrate that the observed mass-based fundamental plane coincides with the MOND fundamental plane determined previously for a set of polytropic spheres chosen to match the observed range of effective radii and velocity dispersions in elliptical galaxies. Moreover, the observed projected mass within one-half of an effective radius is consistent with the mass in visible stars plus a small additional component of ‘phantom dark matter’ resulting from the MOND contribution to photon deflection.

Keywords: gravitational lensing; galaxies: elliptical and lenticular, cD; galaxies: fundamental parameters; galaxies: kinematics and dynamics

Journal Article.  4106 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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