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Fig. 1.

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Gas kinematics in and around a massive halo of the TNG-Cluster simulation with M ∼ 1.6 × 1015M at z = 0. The halo virial radius (white/black circle) and velocity are R200 ∼ 2.5 Mpc and V200 ∼ 1800 km/s, respectively. The primary panel illustrates the radial velocity of the gas, weighted by X-ray luminosity. The trio of smaller panels below detail the dispersion of the radial velocity of the gas weighted by X-ray luminosity (left), the density of the gas normalized to the critical density of the Universe (middle), and the fraction of baryons normalized to the cosmic baryon fraction (right), all for the same object. The projection depth across all panels is set at 1.5 R200c. The halo is closed, meaning all of its baryons are confined within its boundary (the closure radius, Rc, smaller than R200). In contrast, its kinematics is in a state of significant evolution.

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