Kinematic Scaling Relations in Galactic Systems
Summary
Kinematic scaling relations establish quantitative links between the motions of stars and gas in galaxies and their mass content. Among these, the Tully–Fisher relation connects the rotation speed of disc galaxies to their luminosity or stellar mass, while the baryonic Tully–Fisher relation extends this to include gas mass, yielding a tight power‐law correlation over several orders of magnitude. Early‐type systems follow an analogous Faber–Jackson relation based on stellar velocity dispersion. Recent work has further unified these relations by combining ordered rotation and random motions into a single dynamical proxy, demonstrating that galaxies of all morphological types lie on a common scaling plane. These relations probe the efficiency of galaxy formation within dark matter haloes, trace evolutionary trends with redshift, and underpin distance‐measurement techniques that inform cosmological models. The global significance of kinematic scaling relations spans tests of dark matter models, assessments of feedback processes in galaxy formation, and the calibration of observational surveys aimed at mapping large‐scale structure.
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Kinematic Scaling Relations in Galactic Systems publication trend
The graph below shows the total number of articles in kinematic scaling relations in galactic systems across all publications each year (not limited to Nature Index journals).
Technical terms
Baryonic Tully–Fisher relation: Power‐law correlation between a galaxy’s total baryonic mass (stars + gas) and its rotation velocity.
SK parameter: Combined kinematic measure defined by SK² = K Vrot² + σ², integrating rotational velocity and velocity dispersion into a single mass proxy.
Rotation curve: Radial profile of circular velocity in a galaxy’s disc, tracing the distribution of luminous and dark matter.
Velocity dispersion (σ): Measure of random stellar motions within a galaxy, reflecting its dynamical temperature and mass distribution.
Virial velocity: Characteristic circular velocity at a dark matter halo’s virial radius, related to total halo mass under equilibrium.
References
- A Generalist, Automated ALFALFA Baryonic Tully–Fisher Relation. The Astrophysical Journal (2023).
- The redshift evolution of the baryonic Tully–Fisher relation in SIMBA. Monthly Notices of the Royal Astronomical Society (2021).
- Kinematic scaling relations of CALIFA galaxies: A dynamical mass proxy for galaxies across the Hubble sequence. Monthly Notices of the Royal Astronomical Society (2018).
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