paper

Turbulence, Thermal Pressure, and Their Dynamical Effects on Cosmic Baryonic Fluid

arXiv:2407.13138 · doi:10.1093/mnrasl/slae073

Abstract

We employ the IllustrisTNG simulation data to investigate the turbulent and thermal motions of the cosmic baryonic fluid. With continuous wavelet transform techniques, we define the pressure spectra, or density-weighted velocity power spectra, as well as the spectral ratios, for both turbulent and thermal motions. We find that the magnitude of the turbulent pressure spectrum grows slightly from to and increases significantly from to at large scales, suggesting progressive turbulence injection into the cosmic fluid, whereas from to , the spectrum remains nearly constant, indicating that turbulence may be balanced by energy transfer and dissipation. The magnitude of the turbulent pressure spectra also increases with environmental density, with the highest density regions showing a turbulent pressure up to six times that of thermal pressure. We also explore the dynamical effects of turbulence and thermal motions, discovering that while thermal pressure provides support against structure collapse, turbulent pressure almost counteracts this support, challenging the common belief that turbulent pressure supports gas against overcooling.

arXiv comment7 pages, 4 figures, 1 table, submitted to the MNRAS Letters. arXiv admin note: text overlap with arXiv:2404.11255

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