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This is a Quantitative Study study.

October 5, 2025Open Access

The inner rotation curve of the Milky Way

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The derived inner rotation curve agrees with measurements from maser sources and GAIA data, indicating accuracy.
The dark matter density near the Sun is estimated at 0.107 GeV cm$^{-3}$, providing insight into Galactic structure.
Comparison of eastern and western rotation curves reveals an E/W asymmetry, which is analyzed with a sinusoidal fit.
The research suggests a possible weak bar influence within 4 kpc of the Galactic Center, challenging existing models.

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The study derives the inner rotation curve of the Milky Way using terminal velocity methods and longitude-velocity diagrams.

Sofue et al. (2025) studied this question.

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