最遠方銀河での明るい紫外光の起源

The observed UV luminosity function at z ≧ 10 suggests the overabundance of UV-bright (\(M_\mathrm{UV} \lesssim -20\)) and massive galaxies in comparison to pre-JWST theoretical predictions (e.g. Harikane+24, Donnan+24, Perez-Gonzalez+23). Several scenarios can explain the tension (e.g. Inayoshi+22, Dekel+23, Li+23, Mason+23, Yung+24, Shen+23), one of which is dust clearing by radiation-driven outflows (Ferrara+23, 24). To test this scenario, I estimate the extent to which radiation pressure is enhanced in dusty gas. I find that it is boosted by a factor of \(\sim180(Z/0.1Z_\odot)\) compared to the standard Eddington limit. I show that a few galaxies observed at z > 10 have luminosities exceeding the effective Eddington luminosity for a dusty medium and are likely in the dusty outflow phase, while the other 80% of observed galaxies at z > 10 may have already experienced a dusty outflow and expelled their dust by the time of observation.

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