SILCC – VII. Gas kinematics and multiphase outflows of the simulated ISM at high gas surface densities

We present magnetohydrodynamic (MHD) simulations of the star-forming multiphase interstellar medium (ISM) in stratified galactic patches with gas surface densities $\Sigma_\mathrm{gas} =$ 10, 30, 50, and 100 $\mathrm{M_\odot\,pc^{-2}}$. The SILCC project simulation framework accounts for non-equilibrium thermal chemical processes warm cold ISM. sink-based star formation feedback model includes stellar winds, hydrogen-ionising UV radiation, core-collapse supernovae, cosmic ray (CR) injection diffusion. follow observed relation between $\Sigma_\mathrm{gas}$ rate density $\Sigma_\mathrm{SFR}$. CRs qualitatively change outflow phase structure. Without CRs, outflows transition from a two-phase (warm hot at 1 kpc) to single-phase (hot 2 With always has three phases (cold, warm, hot), dominated mass by phase. impact on loading decreases higher factors CR-supported are order unity independent Similar observations, vertical velocity dispersions ionised (WIM) neutral (CNM) correlate as $\sigma_\mathrm{z} \propto \Sigma_\mathrm{SFR}^a$, $a \sim 0.20$. In absence feedback, we find no correlation. dispersion WIM is factor $\sim 2.2$ than that CNM, agreement local observations. For $\Sigma_\mathrm{SFR} \gtrsim 1.5 \times 10^{-2}\,\mathrm{M}_\odot\,\mathrm{yr}^{-1}\,\mathrm{kpc}^{-2}$ motions become supersonic.