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- W3099389301 abstract "Dwarf galaxies populating the Galactic halo are assumed to host the largest fractions of dark matter, as calculated from their velocity dispersions. Their major axes are preferentially aligned with the Vast Polar Structure (VPOS) that is perpendicular to the Galactic disk, and we find their velocity gradients aligned as well. It suggests that tidal forces exerted by the Milky Way are distorting dwarf galaxies. Here we demonstrate on the basis of the impulse approximation that the Galactic gravitational acceleration induces the dwarf line-of-sight velocity dispersion, which is also evidenced by strong dependences between both quantities. Since this result is valid for any dwarf mass value, it implies that dark matter estimate in Milky Way dwarfs cannot be deduced from the product of their radius to the square of their line-of-sight velocity dispersion. This questions the high dark-matter fractions reported for these evanescent systems, and the universally adopted total-to-stellar mass relationship in the dwarf regime. It suggests that many dwarfs are at their first passage and are dissolving into the Galactic halo. It opens a promising way to estimate the Milky Way total mass profile at large distances." @default.
- W3099389301 created "2020-11-23" @default.
- W3099389301 creator A5010869226 @default.
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- W3099389301 creator A5078113123 @default.
- W3099389301 date "2018-06-14" @default.
- W3099389301 modified "2023-10-06" @default.
- W3099389301 title "Galactic Forces Rule the Dynamics of Milky Way Dwarf Galaxies" @default.
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- W3099389301 doi "https://doi.org/10.3847/1538-4357/aac3da" @default.
- W3099389301 hasPublicationYear "2018" @default.
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