Detection of O iii88 μm in JADES-GS-z14-0 at z = 14.1793

Abstract We report the first successful Atacama Large Millimeter/submillimeter Array (ALMA) follow-up observations of a secure z > 10 JWST-selected galaxy, by robustly detecting (6.6 σ ) the O iii 88 μ m line in JADES-GS-z14-0 (hereafter GS-z14). The ALMA detection yields a spectroscopic redshift of z = 14.1793 ± 0.0007, and increases the precision on the prior redshift measurement of z = 14.3 2 − 0.20 + 0.08 from NIRSpec by ≳180×. Moreover, the redshift is consistent with that previously determined from a tentative detection (3.6 σ ) of C iii ] 1907,1909 ( z = 14.178 ± 0.013), solidifying the redshift determination via multiple line detections. We measure a line luminosity of L O iii 88 = (2.1 ± 0.5) × 10 8 L ⊙ , placing GS-z14 at the lower end, but within the scatter of, the local L O iii 88 –star formation rate relation. No dust continuum from GS-z14 is detected, suggesting an upper limit on the dust-to-stellar mass ratio of <2 × 10 −3 , consistent with dust production from supernovae with a yield y d < 0.3 M ⊙ . Combining a previous JWST/MIRI photometric measurement of the O iii λλ 4959,5007 Å and H β lines with Cloudy models, we find GS-z14 to be surprisingly metal-enriched ( Z ∼ 0.05–0.2 Z ⊙ ) a mere 300 Myr after the Big Bang. The detection of a bright oxygen line in GS-z14 thus reinforces the notion that galaxies in the early Universe undergo rapid evolution.