MOND and the lensing Fundamental Plane: No need for dark matter on galaxy scales

Details MOND and the lensing Fundamental Plane: No need for dark matter on galaxy scales MOND and the lensing Fundamental Plane: No need for dark matter on galaxy scales

2008-03-04

arxiv.org/abs/0803.0468v2

Astronomy and Astrophysics

Astrophysics

Minor revisions in response to referee. Revised title. Accepted in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13378.x

Bolton et al. (2007) 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 high-order 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 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.

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