Detection of the Far-infrared [O iii] and Dust Emission in a Galaxy at Redshift 8.312: Early Metal Enrichment in the Heart of the Reionization Era

We present the Atacama Large Millimeter/submillimeter Array detection of the [O iii] 88 μm line and rest-frame 90 μm dust continuum emission in a Y-dropout Lyman break galaxy (LBG), MACS0416_Y1 lying behind the Frontier Field cluster MACS J0416.1−2403. This [O iii] detection confirms the LBG with a spectroscopic redshift of z = 8.3118 ± 0.0003, making this object one of the farthest galaxies ever identified spectroscopically. The observed 850 μm flux density of 137 ± 26 μJy corresponds to a de-lensed total infrared (IR) luminosity of if assuming a dust temperature of Tdust = 50 K and an emissivity index of β = 1.5, yielding a large dust mass of . The ultraviolet-to-far-IR spectral energy distribution modeling where the [O iii] emissivity model is incorporated suggests the presence of a young (τage ≈ 4 Myr), star-forming ( yr−1), moderately metal-polluted (Z ≈ 0.2Z⊙) stellar component with a mass of Mstar = 3 × 108 M⊙. An analytic dust mass evolution model with a single episode of star formation does not reproduce the metallicity and dust mass in τage ≈ 4 Myr, suggesting a pre-existing evolved stellar component with Mstar ∼ 3 × 109 M☉ and τage ∼ 0.3 Gyr as the origin of the dust mass.

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