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AGN outflows can remove large quantities of gas from their host galaxyspheroids, potentially shutting off star formation. On the other hand, they cancompress this gas, potentially enhancing or triggering star formation, at leastfor short periods. We present a set of idealised simulations of AGN outflowsaffecting turbulent gas spheres, and investigate the effect of the outflow andthe AGN radiation field upon gas fragmentation. We show that AGN outflows ofsufficient luminosity shut off fragmentation while the nucleus is active, butgas compression results in a burst of fragmentation after the AGN switches off.Self-shielding of gas against the AGN radiation field allows some fragmentationto occur during outbursts, but too much shielding results in a lower overallfragmentation rate. For our idealised simulation setup, there is a critical AGNluminosity which results in the highest fragmentation rate, with outflows beingtoo efficient at removing gas when $L > L_{\rm crit}$ and not efficient enoughto compress the gas to high densities otherwise. These results, althoughpreliminary, suggest that the interaction between AGN and star formation intheir host galaxies is particularly complex and requires careful study in orderto interpret observations correctly.

Do AGN outflows quench or enhance star formation?