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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2507.22888 |
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| _version_ | 1866911367357792256 |
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| author | Witstok, Joris Smit, Renske Baker, William M. Rinaldi, Pierluigi Hainline, Kevin N. Algera, Hiddo S. B. Arribas, Santiago Bakx, Tom J. L. C. Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma Eisenstein, Daniel J. Heintz, Kasper E. Helton, Jakob M. Jones, Gareth C. Maiolino, Roberto Maseda, Michael V. Pérez-González, Pablo G. Pollock, Clara L. Robertson, Brant E. Saxena, Aayush Scholtz, Jan Shivaei, Irene Sun, Fengwu Tacchella, Sandro Übler, Hannah Watson, Darach Willott, Chris J. Wu, Zihao |
| author_facet | Witstok, Joris Smit, Renske Baker, William M. Rinaldi, Pierluigi Hainline, Kevin N. Algera, Hiddo S. B. Arribas, Santiago Bakx, Tom J. L. C. Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma Eisenstein, Daniel J. Heintz, Kasper E. Helton, Jakob M. Jones, Gareth C. Maiolino, Roberto Maseda, Michael V. Pérez-González, Pablo G. Pollock, Clara L. Robertson, Brant E. Saxena, Aayush Scholtz, Jan Shivaei, Irene Sun, Fengwu Tacchella, Sandro Übler, Hannah Watson, Darach Willott, Chris J. Wu, Zihao |
| contents | 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 $μ$m line at $4.5σ$ significance, precisely at the redshift of several faint emission lines previously seen with JWST/NIRSpec, while the underlying dust continuum remains undetected ($F_ν< 9.0 \, \mathrm{μJy}$), 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 $3σ$). 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-$α$ break, even spectroscopically, should properly take into account the effects of potential damped Lyman-$α$ absorption (DLA) systems to avoid systematic overestimates of up to $Δz \approx 0.5$. The [O III] 88 $μ$m 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_22888 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | On the origins of oxygen: ALMA and JWST characterise the multi-phase, metal-enriched, star-bursting medium within a 'normal' $z > 11$ galaxy Witstok, Joris Smit, Renske Baker, William M. Rinaldi, Pierluigi Hainline, Kevin N. Algera, Hiddo S. B. Arribas, Santiago Bakx, Tom J. L. C. Bunker, Andrew J. Carniani, Stefano Charlot, Stéphane Chevallard, Jacopo Curti, Mirko Curtis-Lake, Emma Eisenstein, Daniel J. Heintz, Kasper E. Helton, Jakob M. Jones, Gareth C. Maiolino, Roberto Maseda, Michael V. Pérez-González, Pablo G. Pollock, Clara L. Robertson, Brant E. Saxena, Aayush Scholtz, Jan Shivaei, Irene Sun, Fengwu Tacchella, Sandro Übler, Hannah Watson, Darach Willott, Chris J. Wu, Zihao Astrophysics of Galaxies 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 $μ$m line at $4.5σ$ significance, precisely at the redshift of several faint emission lines previously seen with JWST/NIRSpec, while the underlying dust continuum remains undetected ($F_ν< 9.0 \, \mathrm{μJy}$), 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 $3σ$). 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-$α$ break, even spectroscopically, should properly take into account the effects of potential damped Lyman-$α$ absorption (DLA) systems to avoid systematic overestimates of up to $Δz \approx 0.5$. The [O III] 88 $μ$m 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. |
| title | On the origins of oxygen: ALMA and JWST characterise the multi-phase, metal-enriched, star-bursting medium within a 'normal' $z > 11$ galaxy |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2507.22888 |