Galactic Dynamics and Structure of Stellar Streams
Summary
Stellar streams are elongated collections of stars liberated from disrupted globular clusters or dwarf galaxies as they orbit within a host galaxy’s gravitational potential. Their morphology, kinematics and phase-space distribution are shaped by the underlying mass profile of the Milky Way, including its dark matter halo and perturbations from massive satellites such as the Large Magellanic Cloud. By tracing the positions, velocities and chemical properties of stream stars, researchers can infer the Galactic acceleration field, reconstruct the accretion history of the halo and constrain the abundance and mass spectrum of dark matter substructures. High-resolution imaging surveys and astrometric missions have revealed a rich population of thin, cold streams whose density fluctuations record past encounters with subhaloes, while wide-field photometric programmes are extending the census of streams to external galaxies. Combined with advanced N-body and semi-analytical modelling, these observations are refining our picture of hierarchical assembly, testing cosmological predictions and probing the shape and evolution of the Galactic potential.
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Galactic Dynamics and Structure of Stellar Streams publication trend
The graph below shows the total number of articles in galactic dynamics and structure of stellar streams across all publications each year (not limited to Nature Index journals).
Technical terms
Stellar stream: A linear arrangement of stars formed by tidal disruption of a progenitor system orbiting within a host galaxy.
Gravitational potential: The scalar field describing the acceleration experienced by objects under the influence of a galaxy’s mass distribution.
N-body simulation: A computational method that evolves the trajectories of many interacting particles under mutual gravitational forces.
Tidal stripping: The process by which gravitational forces remove stars from a satellite system as it moves through a stronger potential.
Phase space: The combined coordinate and velocity space in which the complete dynamical state of a system is represented.
References
- Hidden depths in the local Universe: The Stellar Stream Legacy Survey. Astronomy & Astrophysics (2023).
- S 5: Probing the Milky Way and Magellanic Clouds potentials with the 6D map of the Orphan–Chenab stream. Monthly Notices of the Royal Astronomical Society (2023).
- Streams on FIRE: Populations of Detectable Stellar Streams in the Milky Way and FIRE. The Astrophysical Journal (2023).
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