This pedagogical review concludes that the Milky Way's claimed Keplerian rotation-curve decline is plausible but systematically challenged by Jeans-model biases and independent mass constraints.
Decrease in Milky Way rotation curve revisited
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abstract
Context. Latest papers on the rotation curve of the Milky Way galaxy, i. e. Ou et al. (2024); Jiao et al. (2023); Sylos Labini et al. (2023) suggest a Keplerian decrease in the rotation curve. This behavior is not consistent with other spiral galaxies (Lelli et al. 2016; Mistele et al. 2024). Aims. Show that the prior use of the axisymmetric Jeans equation is not consistent with the final model produced in the papers. Methods. Comparison of the results on gravitational potential in Ou et al. (2024); Jiao et al. (2023); Sylos Labini et al. (2023) with the prior assumptions about the axisymemtric properties of the Milky Way galaxy. Results. The gravitational potentials published by Ou et al. (2024); Jiao et al. (2023); Sylos Labini et al. (2023) lead to almost spherically symmetric properties of the Milky Way galaxy at Galactocentric radii above 20 kpc, which is not consistent with the use of axisymmetric Jeans equations.
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The Rotation Curve of the Milky Way: State of the Art, the Keplerian Decline Debate, and Implications for Dark Matter
This pedagogical review concludes that the Milky Way's claimed Keplerian rotation-curve decline is plausible but systematically challenged by Jeans-model biases and independent mass constraints.