The velocity distribution of Sloan Digital Sky Survey satellites in Modified Newtonian Dynamics

Journal article

Authors/Editors

Angus, Garry

Research Areas

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Publication Details

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

Publisher: Oxford University Press

Place: OXFORD

Publication year: 2008

Journal: Monthly Notices of the Royal Astronomical Society (0035-8711)

Journal acronym: MON NOT R ASTRON SOC

Volume number: 383

Issue number: 1

Start page: L1

End page: L4

ISSN: 0035-8711

eISSN: 1365-2966

Languages: English-Great Britain (EN-GB)

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Abstract

The recent Sloan Digital Sky Survey measured velocity distribution of satellite galaxies has been modelled in the context of Modified Newtonian Dynamics (MOND). We show that even when the extra constraint of adhering to the projected satellite number density profile is added, the two line-of-sight (los) velocity dispersion profiles presented in Klypin & Prada can be matched simply with a radially varying anisotropy. Interestingly, the anisotropies required to fit the los velocity dispersions are remarkably similar to the anisotropies generated by dissipationless collapse simulations in MOND. The mass-to-light ratios of the two host galaxies used are sensible, and positivity of the distribution function is satisfied.

Keywords

Dark matter, galaxies : clusters, gravitation

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