http://arxiv.org/abs/1812.10714
It is widely accepted that Milky Way (MW) dwarfs are the most dark matter (DM) dominated galaxies. Their DM content is estimated through its projected density along the line of sight (los). Here we demonstrate that this quantity correlates with their distance to the MW, falsifying the calculations of DM in dwarfs. Moreover, we show that the acceleration deduced from the los velocity dispersion is entirely due to MW tidal shocks. This regime is expected in the astronomical context for which MW dwarfs are descendants of infalling gas-rich galaxies. It implies that they have no DM, or, alternatively that DM could not play a role in them, questioning, e.g., their use as targets for DM searches.
F. Hammer, Y. Yang, J. Wang, et. al.
Mon, 31 Dec 18
36/57
Comments: 10 pages, 6 Figures, 2 Tables, submitted on October 23, 2018 to Physical Review Letters
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