On the origins of oxygen: ALMA and JWST characterise the multi-phase, metal-enriched, star-bursting medium within a ‘normal’’ z > 11 galaxy

Witstok, J ORCID: 0000-0002-7595-121X, Smit, R ORCID: 0000-0001-8034-7802, Baker, WM ORCID: 0000-0003-0215-1104, Rinaldi, P ORCID: 0000-0002-5104-8245, Hainline, KN ORCID: 0000-0003-4565-8239, Algera, HSB, Arribas, S ORCID: 0000-0001-7997-1640, Bakx, TJLC ORCID: 0000-0002-5268-2221, Bunker, AJ ORCID: 0000-0002-8651-9879, Carniani, S ORCID: 0000-0002-6719-380X, Charlot, S ORCID: 0000-0003-3458-2275, Chevallard, J ORCID: 0000-0002-7636-0534, Curti, M ORCID: 0000-0002-2678-2560, Curtis-Lake, E ORCID: 0000-0002-9551-0534, Eisenstein, DJ ORCID: 0000-0002-2929-3121, Heintz, KE ORCID: 0000-0002-9389-7413, Helton, JM ORCID: 0000-0003-4337-6211, Jones, GC ORCID: 0000-0002-0267-9024, Maiolino, R ORCID: 0000-0002-4985-3819, Maseda, MV ORCID: 0000-0003-0695-4414 et al (2026) On the origins of oxygen: ALMA and JWST characterise the multi-phase, metal-enriched, star-bursting medium within a ‘normal’’ z > 11 galaxy. Open Journal of Astrophysics, 9. ISSN 2565-6120

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Abstract

The unexpectedly high abundance of galaxies at z > 11 revealed by JWST has sparked a debate on the nature of early galaxies and the physical mechanisms regulating their formation. The Atacama Large Millimeter/submillimeter Array (ALMA) has begun to provide vital insights on their gas and dust content, but so far only for extreme 'blue monsters'. Here we present new, deep ALMA observations of JADES-GS-z11-0, a more typical (sub-L^*) z > 11 galaxy that bridges the discovery space of JWST and the Hubble Space Telescope. These data confirm the presence of the [O III] 88 \mum line at 4.5\sigma significance, precisely at the redshift of several faint emission lines previously seen with JWST/NIRSpec, while the underlying dust continuum remains undetected (F_\nu < 9.0 \, \mathrm{\mu Jy}), implying an obscured star formation rate (SFR) of \text{SFR}_\text{IR} \lesssim 6 \, \mathrm{M_\odot \, yr^{-1}} and dust mass of M_\text{dust} \lesssim 1.0 \times 10^{6} \, \mathrm{M_\odot} (all 3\sigma). The accurate ALMA redshift of z_\text{[O III]} = 11.1221 \pm 0.0006 (\gtrsim \! 5\times refined over NIRSpec) helps confirm that redshifts measured purely from the Lyman-\alpha break, even spectroscopically, should properly take into account the effects of potential damped Lyman-\alpha absorption (DLA) systems to avoid systematic overestimates of up to \Delta z \approx 0.5. The [O III] 88 \mum luminosity of L_\text{[O III]} = (1.1 \pm 0.3) \times 10^{8} \, \mathrm{L_\odot}, meanwhile, agrees well with the scaling relation for local metal-poor dwarfs given the SFR measured by NIRCam, NIRSpec, and MIRI. The spatially resolved MIRI and ALMA emission also underscores that JADES-GS-z11-0 is likely to consist of two low-mass components that are undergoing strong bursts of star formation yet are already pre-enriched in oxygen (~20-30% solar), only 400 Myr after the Big Bang.

Item Type:	Article
Uncontrolled Keywords:	5101 Astronomical Sciences; 51 Physical Sciences; 5101 Astronomical Sciences; 51 Physical Sciences
Subjects:	Q Science > QB Astronomy
Divisions:	Astrophysics Research Institute
Publisher:	Maynooth Academic Publishing
Date of acceptance:	9 January 2026
Date Deposited:	08 Jun 2026 13:23
Last Modified:	08 Jun 2026 13:23
DOI or ID number:	10.33232/001c.155261
URI:	https://researchonline.ljmu.ac.uk/id/eprint/28776

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