What question did this study set out to answer?

This research aims to develop a framework for evaluating kinematic coherence in the Milky Way stellar halo.

March 10, 2026Open Access

Kinematic Coherence in the Milky Way Halo: A Data-Driven Framework with Gaia DR3 and Spectroscopic Surveys Radial Coherential Dynamics — Paper XXIV

Key Points

This research aims to develop a framework for evaluating kinematic coherence in the Milky Way stellar halo.
Defined proxies for radial and tangential velocity correlations.
Established the kinematic coherence length L_KC.
Developed a two-layer null model using the Jeans equation and simulations.
Tested residual kinematic organization against previous coherence profiles.
Introduced three primary proxies for analyzing velocity correlations.
Defined four kill switches to refine the analysis framework.
A two-layer model provides a foundation for future data-driven studies.

Abstract

We define a quantitative framework for testing kinematic coherence (Class IV) in the Milky Way stellar halo using Gaia DR3 cross-matched with spectroscopic surveys (APOGEE, LAMOST, SDSS). Three primary proxies are introduced: radial and tangential velocity correlation functions and the kinematic coherence length LKC. A two-layer null model combines the Jeans equation with simulation-calibrated correlation expectations (Illustris-TNG, FIRE, Auriga). An RCD-inspired structural alternative tests whether residual kinematic organization correlates with the quasi-static coherence profile C₀ (r) from Papers XIV-XVII. Four kill switches are defined. This paper (XXIV-a) specifies the framework; data-driven execution is deferred to XXIV-b.

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Kinematic Coherence in the Milky Way Halo: A Data-Driven Framework with Gaia DR3 and Spectroscopic Surveys Radial Coherential Dynamics — Paper XXIV

Key Points

Abstract

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