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We investigate the conditions that facilitate galactic-scale outflows using asample of 155 typical star-forming galaxies at $z$~2 drawn from the MOSFIREDeep Evolution Field (MOSDEF) survey. The sample includes deep rest-frame UVspectroscopy from the Keck Low-Resolution Imaging Spectrometer (LRIS), whichprovides spectral coverage of several low-ionisation interstellar (LIS) metalabsorption lines and Ly$\alpha$ emission. Outflow velocities are calculatedfrom the centroids of the LIS absorption and/or Ly$\alpha$ emission, as well asthe highest-velocity component of the outflow from the blue wings of the LISabsorption lines. Outflow velocities are found to be marginally correlated orindependent of galaxy properties, such as star-formation rate (SFR) andstar-formation rate surface density ($\Sigma_{\rm SFR}$). Outflow velocityscales with SFR as a power-law with index 0.24, which suggests that theoutflows may be primarily driven by mechanical energy generated by supernovaeexplosions, as opposed to radiation pressure acting on dusty material. On theother hand, outflow velocity and $\Sigma_{\rm SFR}$ are not significantlycorrelated, which may be due to the limited dynamic range of $\Sigma_{\rm SFR}$probed by our sample. The relationship between outflow velocity and$\Sigma_{\rm SFR}$ normalised by stellar mass ($\Sigma_{\rm sSFR}$), as a proxyfor gravitational potential, suggests that strong outflows (e.g., > 200 kms$^{-1}$) appear ubiquitous above a threshold of log($\Sigma_{\rmsSFR}/\rm{yr}^{-1}\ \rm{kpc}^{-2}$) ~ -11.3, and that above this threshold,outflow velocity uncouples from $\Sigma_{\rm sSFR}$. These results highlightthe need for higher resolution spectroscopic data and spatially resolvedimaging to test the driving mechanisms of outflows predicted by theory.

The MOSDEF-LRIS Survey: Connection between Galactic-scale Outflows and the Properties of $z$~2 star-forming Galaxies