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

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 (...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 2008-01, Vol.383 (1), p.L1-L4
Main Authors: Angus, G. W., Famaey, B., Tiret, O., Combes, F., Zhao, H. S.
Format: Article
Language:English
Subjects:
Astrophysics
dark matter
galaxies: clusters
gravitation
Physics
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Summary: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.
ISSN:1745-3925
0035-8711
1745-3933
1365-2966
DOI:10.1111/j.1745-3933.2007.00393.x