Velocity dispersion around ellipticals in MOND

Journal article

Authors / Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Tiret O, Combes F, Angus GW, Famaey B, Zhao HS

Publisher: EDP Sciences

Place: LES ULIS CEDEX A

Publication year: 2007

Journal: Astronomy & Astrophysics (0004-6361)

Journal acronym: ASTRON ASTROPHYS

Volume number: 476

Issue number: 1

Start page: L1

End page: L4

ISSN: 0004-6361

eISSN: 1432-0746

Languages: English-Great Britain (EN-GB)

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Abstract

We investigate how different models that have been proposed for solving the dark matter problem can fit the velocity dispersion observed around elliptical galaxies, on either a small scale (similar to 20 kpc) with stellar tracers, such as planetary nebulae, or large scale (similar to 200 kpc) with satellite galaxies as tracers. Predictions of Newtonian gravity, either containing pure baryonic matter, or embedded in massive cold dark matter (CDM) haloes, are compared with predictions of the modified gravity of MOND. The standard CDM model has problems on a small scale, and the Newtonian pure baryonic model has difficulties on a large scale, while a fit with MOND is possible on both scales.

Keywords

cosmology : dark matter, galaxies : elliptical and lenticular, cD, galaxies : kinematics and dynamics

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