MOND mass-to-light ratios for galaxy groups

Details MOND mass-to-light ratios for galaxy groups MOND mass-to-light ratios for galaxy groups

2002-03-25

arxiv.org/abs/astro-ph/0203429v2

Astrophys.J.577:L75,2002

Astronomy and Astrophysics

Astrophysics

7 pages, Astrophys. J. Lett., in press

Scientific paper

10.1086/344253

I estimate MOND M/L values for nine galaxy groups that were recently studied by Tully et al.. Instead of the large M/L values that they find with Newtonian dynamics (up to 1200 solar units) the MOND estimates cluster around 1 solar unit. Tully et al. find a systematic and significant difference between the M/L values of groups that do not contain luminous galaxies and those that do: Dwarfs-only groups have larger M/L values (by a factor of about 5). The MOND M/L values do not show this trend; the Newtonian disparity is traced back to the dwarfs-only groups having systematically smaller intrinsic accelerations (similar sizes, but rather smaller velocity dispersions).

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