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Fig. 3.

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Mass-weighted spherically binned radial profiles of density, temperature, radial velocity, vorticity squared, sonic Mach number, magnetic field strength, magnetic field amplification B/ρ2/3, and the magnetic-to-kinetic energy density ratio EB/EK for halo 1 when reaching a peak density of 3 × 10−13 g cm−3 using a fixed Jeans resolution of 128 cells per Jeans length. The quantity B/ρ2/3 is normalised by with B0 the initial magnetic field strength and ρ0 the cosmic mean baryon density at z = 100. The light blue lines represent the simulations with J21 = 103 where the cooling is driven via molecular hydrogen, and the red lines are for simulations with J21 = 105 where the cooling is driven by atomic hydrogen. The solid lines are for runs with B0 = 10−8 [G] (proper), dashed lines for runs with B0 = 10−10 [G] (proper), and dotted lines for runs with B0 = 10−14 [G] (proper). The infall velocity tends to be higher and the vorticity tends to be larger for the simulations using J21 = 105, while the sonic mach number tends to be smaller compared to the simulations with J21 = 103 following the thermal evolution of the halo. Magnetic field strength, B/ρ2/3 and EB/EK also tend to be higher for the simulations in the atomic cooling regime, which is consistent with the behaviour of the physical properties of the halo.

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