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Recent observations indicate that galactic outflows are ubiquitous in highredshift galaxies, including normal star forming galaxies, quasar hosts, anddusty star forming galaxies (DSFGs). However, the impact of outflows on theevolution of their hosts is still an open question. Here, we analyse the starformation histories (SFH) and galactic outflow properties of galaxies inmassive haloes ($10^{12}M_{\odot}<M_{\rm vir} <5\times 10^{12}M_{\odot}$) at$z\gtrsim5.5$ in three zoom-in cosmological simulations from the MassiveFIREsuite, as part of the Feedback In Realistic Environments (FIRE) project. Thesimulations were run with the FIRE-2 model, which does not include feedbackfrom active galactic nuclei (AGN). The simulated galaxies resemble $z>4$ DSFGs,with SFRs of $\sim 1000\ M_{\odot}\rm yr^{-1}$ and molecular gas masses of$M_{\rm mol}\sim 10^{10}\ M_{\odot}$. However, the simulated galaxies arecharacterised by higher circular velocities than those observed in high-zDSFGs. The mass loading factors from stellar feedback are of the order of $\sim0.1$, implying that stellar feedback is inefficient in driving galacticoutflows and gas is consumed by star formation on much shorter time-scales thanit is expelled from the interstellar medium (ISM). We also find that stellarfeedback is highly inefficient in self-regulating star formation in thisregime, with an average integrated star formation efficiency (SFE) perdynamical time of $30\%$. Finally, compared to FIRE-2 galaxies hosted insimilarly massive haloes at lower redshift, we find lower mass loading factorsand higher SFEs in the high redshift sample. We argue that both effectsoriginate from the higher total and gas surface densities that characterisehigh$-z$ massive systems.

The inefficiency of stellar feedback in driving galactic outflows in massive galaxies at high redshift