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The necessity of dark matter in MOND within galactic scales

Ferreras, I; Sakellariadou, M; Yusaf, MF; (2008) The necessity of dark matter in MOND within galactic scales. Physical Review Letters , 100 (3) , Article 031302. 10.1103/PhysRevLett.100.031302. Green open access

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Abstract

To further test MOdified Newtonian Dynamics (MOND) on galactic scales -- originally proposed to explain the rotation curves of disk galaxies without dark matter -- we study a sample of six strong gravitational lensing early-type galaxies from the CASTLES database. To determine whether dark matter is present in these galaxies, we compare the total mass (from lensing) with the stellar mass content (from a comparison of photometry and stellar population synthesis). We find 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 this excess 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 MONDian scale of $\sim 10^{-10}$m/s$^2$. This is a serious challenge to MOND unless the proper treatment of lensing is qualitatively different (possibly to be developed within a consistent theory such as TeVeS).

Type: Article
Title: The necessity of dark matter in MOND within galactic scales
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevLett.100.031302
Publisher version: http://dx.doi.org/10.1103/PhysRevLett.100.031302
Language: English
Additional information: © 2008 The American Physical Society. 5 pages, 3 figures, 1 table Amended version to match publication in Phys. Rev. lett
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/64633
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