Cooling flows as a research area focuses on the radiative cooling and subsequent inflow of hot, X-ray–emitting intracluster or intragroup medium gas toward the centers of galaxy clusters or massive galaxies. It investigates the thermodynamic balance between cooling, gravitational infall, and heating processes such as active galactic nucleus (AGN) feedback, thermal conduction, and turbulence. This field combines observational X-ray, optical, and radio data with hydrodynamical and magnetohydrodynamical simulations to quantify mass deposition rates, entropy profiles, multiphase gas formation, and star-formation fueling, aiming to resolve the “cooling flow problem” and establish self-regulated feedback models in large-scale structures.
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