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- W3099172308 abstract "We apply Noether's theorem to observations of main-sequence stars from the Gaia Data Release 2 archive to probe the matter distribution function of the Galaxy. That is, we examine the axial symmetry of stars at vertical heights z, , to probe the quality of the angular momentum Lz as an integral of motion. The failure of this symmetry test would speak to a Milky Way, in both its visible and dark matter, that is not isolated and/or not in steady state. The left–right symmetry-breaking pattern we have observed, north and south, reveals both effects, with a measured deviation from symmetry of typically 0.5%. We show that a prolate form of the gravitational distortion of the Milky Way by the Large Magellanic Cloud, determined from fits to the Orphan stream by Erkal et al., is compatible with the size and sign of the axial-symmetry-breaking effects we have discovered in our sample of up to 14.4 million main-sequence stars, speaking to a distortion of an emergent, rather than static, nature." @default.
- W3099172308 created "2020-11-23" @default.
- W3099172308 creator A5016972819 @default.
- W3099172308 creator A5021509621 @default.
- W3099172308 creator A5050792356 @default.
- W3099172308 date "2020-02-18" @default.
- W3099172308 modified "2023-10-02" @default.
- W3099172308 title "Applying Noether’s Theorem to Matter in the Milky Way: Evidence for External Perturbations and Non-steady-state Effects from <i>Gaia</i> Data Release 2" @default.
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- W3099172308 doi "https://doi.org/10.3847/1538-4357/ab66c8" @default.
- W3099172308 hasPublicationYear "2020" @default.
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