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We investigate the energy sources of random turbulent motions of ionised gasfrom H$\alpha$ emission in eight local star-forming galaxies from theSydney-AAO Multi-object Integral field spectrograph (SAMI) Galaxy Survey. Thesegalaxies satisfy strict pure star-forming selection criteria to avoidcontamination from active galactic nuclei (AGN) or strong shocks/outflows.Using the relatively high spatial and spectral resolution of SAMI, we find that-- on sub-kpc scales our galaxies display a flat distribution of ionised gasvelocity dispersion as a function of star formation rate (SFR) surface density.A major fraction of our SAMI galaxies shows higher velocity dispersion thanpredictions by feedback-driven models, especially at the low SFR surfacedensity end. Our results suggest that additional sources beyond star formationfeedback contribute to driving random motions of the interstellar medium (ISM)in star-forming galaxies. We speculate that gravity, galactic shear, and/ormagnetorotational instability (MRI) may be additional driving sources ofturbulence in these galaxies.

The SAMI Galaxy Survey: energy sources of the turbulent velocity dispersion in spatially-resolved local star-forming galaxies