Dynamics and Phenomena of Galaxy Clusters
Summary
Galaxy clusters represent the most massive gravitationally bound systems in the Universe, comprising hundreds to thousands of galaxies embedded in a vast halo of dark matter and suffused by a hot, X-ray emitting plasma known as the intracluster medium (ICM). Their dynamics are governed by hierarchical assembly, in which smaller groups coalesce through gravitational attraction, often producing violent merger events. These mergers drive shock waves, turbulence and bulk flows in the ICM, giving rise to phenomena such as bow shocks, cold fronts and radio relics. The collisionless nature of dark matter contrasts with the collisional behaviour of baryonic gas, leading to measurable offsets between mass peaks and X-ray emission. Observational techniques across the electromagnetic spectrum—from optical lensing to deep X-ray and radio imaging—combined with high-resolution numerical simulations, have established clusters as crucial probes of cosmology, dark matter properties and plasma physics under extreme conditions.
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Dynamics and Phenomena of Galaxy Clusters publication trend
The graph below shows the total number of articles in dynamics and phenomena of galaxy clusters across all publications each year (not limited to Nature Index journals).
Technical terms
Intracluster medium (ICM): The diffuse, X-ray emitting hot plasma that permeates the space between galaxies within a cluster.
Dark matter halo: The dominant gravitational component of a cluster, composed of non-luminous matter that interacts primarily via gravity.
Bow shock: A shock front formed when a subcluster moves supersonically through the ICM of a larger cluster.
Cold front: A sharp interface in the ICM marked by abrupt changes in density and temperature, often produced by gas sloshing or mergers.
Weak gravitational lensing: The subtle distortion of background galaxy images by a cluster’s mass, used to infer the total mass distribution without dynamical assumptions.
Mach number: The ratio of the velocity of a feature (such as a shock) to the local sound speed in the plasma.
References
- Merging galaxy clusters in IllustrisTNG. Astronomy & Astrophysics (2023).
- Distribution of Hα Emitters in Merging Galaxy Clusters. The Astronomical Journal (2024).
- Weak-lensing Mass Bias in Merging Galaxy Clusters. The Astrophysical Journal (2023).
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