Can Supernovae Quench Star Formation in High-z Galaxies?

JWST is providing a unique opportunity to directly study the feedback processes regulating star formation (SF) in early galaxies. The two z > 5 quiescent systems (JADES-GS-z7-01-QU and MACS0417-z5BBG) detected so far show a recent starburst after which SF is suppressed. To clarify whether such quenching is due to supernova (SN) feedback, we have developed a minimal physical model. We derive a condition on the minimum star formation rate, SFRmin, lasting for a time interval Delta t(b), required to quench SF in a galaxy at redshift z, with gas metallicity Z, and hosted by a halo of mass M-h. We find that lower (z, Z, M-h) systems are more easily quenched. We then apply the condition to JADES-GS-z7-01-QU (z = 7.3, M-star = 10(8.6)M(circle dot)) and MACS0417-z5BBG (z = 5.2, M-star = 10(7.6)M(circle dot)) and find that SN feedback largely fails to reproduce the observed quenched SF history. Alternatively, we suggest that SF is rapidly suppressed by radiation-driven dusty outflows sustained by the high specific star formation rates (43 and 25 Gyr(-1), respectively) of the two galaxies. Our model provides a simple tool to interpret the SF histories of post-starburst galaxies and unravel quenching mechanisms from incoming JWST data.