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

par Angus, Garry;Zhao, Hongsheng;Famaey, Benoît ;Tiret, O.;Combes, Françoise
Référence Royal Astronomical Society. Monthly Notices. Letters (Print), 383, 1, page (L1-L4)
Publication Publié, 2008-01

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Résumé :

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 anisotropics required to fit the los velocity dispersions are remarkably similar to the anisotropics 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. © 2007 The Authors. Journal compilation © 2007 RAS.