Necessity of Dark Matter in Modified Newtonian Dynamics within Galactic Scales

Ignacio Ferreras, Mairi Sakellariadou, and Muhammad Furqaan Yusaf
Phys. Rev. Lett. 100, 031302 – Published 25 January 2008

Abstract

To test modified Newtonian dynamics (MOND) on galactic scales, we study six strong gravitational lensing early-type galaxies from the CASTLES sample. Comparing the total mass (from lensing) with the stellar mass content (from a comparison of photometry and stellar population synthesis), we conclude that strong gravitational lensing on galactic scales requires a significant amount of dark matter, even within MOND. On such scales a 2 eV neutrino cannot explain the excess of matter in contrast with recent claims to explain the lensing data of the bullet cluster. The presence of dark matter is detected in regions with a higher acceleration than the characteristic MOND scale of 1010m/s2. This is a serious challenge to MOND unless lensing is qualitatively different [possibly to be developed within a covariant, such as Tensor-Vector-Scalar (TeVeS), theory].

  • Figure
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  • Received 20 September 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.031302

©2008 American Physical Society

Authors & Affiliations

Ignacio Ferreras*, Mairi Sakellariadou, and Muhammad Furqaan Yusaf

  • Department of Physics, King’s College London, Strand WC2R 2LS, London, United Kingdom

  • *ferreras@star.ucl.ac.uk
  • Mairi.Sakellariadou@kcl.ac.uk
  • Muhammad.Yusaf@kcl.ac.uk

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Issue

Vol. 100, Iss. 3 — 25 January 2008

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