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Are Milky-Way dwarf-spheroidal galaxies dark-matter free?

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arxiv 1909.07979 v2 pith:M75745K6 submitted 2019-09-17 astro-ph.GA gr-qchep-ph

F. Hammer , Y. B. Yang , J. L. Wang , F. Arenou , C. Babusiaux , M. Puech , H. Flores This is my paper · ORCID
classification astro-ph.GAgr-qchep-ph
keywords galaxiesdark-matterdsphsdwarffreemainpastreproduce
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We have found that the high velocity dispersions of dwarf spheroidal galaxies (dSphs) can be well explained by Milky Way (MW) tidal shocks, which reproduce precisely the gravitational acceleration previously attributed to dark matter (DM). Here we summarize the main results of Hammer et al. (2019) who studied the main scaling relations of dSphs and show how dark-matter free galaxies in departure from equilibrium reproduce them well, while they appear to be challenging for the DM model. These results are consistent with our most recent knowledge about dSph past histories, including their orbits, their past star formation history and their progenitors, which are likely tiny dwarf irregular galaxies.

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