Dusty winds clear JWST super-early galaxies

Abstract

The JWST discovery of a number of super-early (redshift $z>10$), blue galaxies requires these systems to be essentially dust-free in spite of their large stellar masses. A possible explanation is that dust is evacuated by radiatively-driven outflows. We test this hypothesis by deriving the Eddington ratio ${\lambda }_E=L_{\mathrm{bol}}/L_E$, where $L_{\mathrm{bol}}$ is the bolometric luminosity produced by star-formation and possible black hole accretion, for 134 galaxies at $6.5<z<16$. We find a strong anti-correlation between ${\lambda }_E$ and dust UV optical depth, ${\tau }_{1500}\propto {\lambda }_E^{-0.63}$; also, ${\lambda }_E$ increases with redshift. We confirm that galaxies exceeding a specific star formation rate $\mathrm{sSFR}>13\mathrm{Gy}{\mathrm{r}}^{-1}$ develop powerful outflows clearing the galaxy from its dust. This result is supported by ALMA dust continuum non-detections in three super-early systems.

ApJ Letters in press

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