Find in Library
Search millions of books, articles, and more
Indexed Open Access Databases
Dusty-wind-clear JWST Super-early Galaxies
oleh: Fabrizio Fiore, Andrea Ferrara, Manuela Bischetti, Chiara Feruglio, Andrea Travascio
Format: | Article |
---|---|
Diterbitkan: | IOP Publishing 2023-01-01 |
Deskripsi
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 λ _E = L _bol / L _E , where L _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 anticorrelation between λ _E and dust UV optical depth, ${\tau }_{1500}\propto {\lambda }_{E}^{-0.63};$ also, λ _E increases with redshift. We confirm that galaxies exceeding a specific star formation rate sSFR > 13 Gyr ^−1 develop powerful outflows clearing the galaxy from its dust. This result is supported by ALMA dust continuum nondetections in three super-early systems.