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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2512.14486 |
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| author | Algera, Hiddo S. B. Weaver, John R. Bakx, Tom J. L. C. Aravena, Manuel Bouwens, Rychard J. Cescon, Karin Chen, Chian-Chou da Cunha, Elisabete Dayal, Pratika Faisst, Andreas Ferrara, Andrea Fujimoto, Seiji Hashimoto, Takuya Heintz, Kasper Herrera-Camus, Rodrigo Hodge, Jacqueline Inami, Hanae Inoue, Akio K. Matthee, Jorryt Meyer, Romain Mizukoshi, Shoichiro Mondal, Chayan Nanayakkara, Themiya Oesch, Pascal A. Pallottini, Andrea Röttgering, Huub Rowland, Lucie E. Schouws, Sander Smit, Renske Sommovigo, Laura Stark, Daniel P. Sugahara, Yuma Vallini, Livia Vijarnwannaluk, Bovornpratch van der Werf, Paul Werner, Norbert Witstok, Joris Xiao, Mengyuan |
| author_facet | Algera, Hiddo S. B. Weaver, John R. Bakx, Tom J. L. C. Aravena, Manuel Bouwens, Rychard J. Cescon, Karin Chen, Chian-Chou da Cunha, Elisabete Dayal, Pratika Faisst, Andreas Ferrara, Andrea Fujimoto, Seiji Hashimoto, Takuya Heintz, Kasper Herrera-Camus, Rodrigo Hodge, Jacqueline Inami, Hanae Inoue, Akio K. Matthee, Jorryt Meyer, Romain Mizukoshi, Shoichiro Mondal, Chayan Nanayakkara, Themiya Oesch, Pascal A. Pallottini, Andrea Röttgering, Huub Rowland, Lucie E. Schouws, Sander Smit, Renske Sommovigo, Laura Stark, Daniel P. Sugahara, Yuma Vallini, Livia Vijarnwannaluk, Bovornpratch van der Werf, Paul Werner, Norbert Witstok, Joris Xiao, Mengyuan |
| contents | We present deep ALMA Band 7 observations of the [OIII] $88μ$m line and underlying dust continuum emission in four UV-bright, gravitationally lensed (magnification $μ= 1.4-3.8$), JWST-selected galaxies at $z = 8.5 - 10.3$, with observed magnitudes $-22.5 \lesssim M_\mathrm{UV} \lesssim -20.5$. [OIII] $88μ$m is confidently detected in UNCOVER-10646 at $z=8.5080 \pm 0.0011$ ($15σ$) and DHZ1 at $z=9.3113 \pm 0.0005$ ($6σ$), with both being intrinsically luminous systems [$L_\mathrm{[OIII]} = (1.1 - 1.6) \times 10^9$ $L_\odot$] that follow the local [OIII]-SFR relation. [OIII] $88μ$m remains undetected in the two $z>10$ targets, including in the $z=10.07$ X-ray AGN UHZ1, where we obtain a deep limit of $L_\mathrm{[OIII]} < 6 \times 10^7$ $L_\odot$. Dust emission is not detected in any individual source nor in a stack ($<3σ$). The high S/N [OIII] $88μ$m detection in UNCOVER-10646 uniquely reveals an additional broad component ($\mathrm{FWHM} = 1366_{-329}^{+473}$ $\mathrm{km/s}$; $Δ\mathrm{BIC}\approx20$) indicative of an ionized outflow. We infer a high outflow rate of $\dot{M}_\mathrm{out} = 128_{-46}^{+80}$ $M_\odot\mathrm{yr}^{-1}$, corresponding to a mass loading factor $η= \dot{M}_\mathrm{out}/\mathrm{SFR} = 2.9_{-1.0}^{+1.8}$ that is broadly consistent with theoretical predictions and JWST-based studies of ionized outflows at high redshift. While high-resolution ALMA follow-up is required to confirm the outflow, this first systematic study at $z>8$ highlights the unique diagnostic power of [OIII] $88μ$m in characterizing galaxies in the early Universe. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_14486 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A first systematic study of [OIII] 88$μ$m at $z>8$: two luminous oxygen lines and a powerful ionized outflow in the first 600 million years Algera, Hiddo S. B. Weaver, John R. Bakx, Tom J. L. C. Aravena, Manuel Bouwens, Rychard J. Cescon, Karin Chen, Chian-Chou da Cunha, Elisabete Dayal, Pratika Faisst, Andreas Ferrara, Andrea Fujimoto, Seiji Hashimoto, Takuya Heintz, Kasper Herrera-Camus, Rodrigo Hodge, Jacqueline Inami, Hanae Inoue, Akio K. Matthee, Jorryt Meyer, Romain Mizukoshi, Shoichiro Mondal, Chayan Nanayakkara, Themiya Oesch, Pascal A. Pallottini, Andrea Röttgering, Huub Rowland, Lucie E. Schouws, Sander Smit, Renske Sommovigo, Laura Stark, Daniel P. Sugahara, Yuma Vallini, Livia Vijarnwannaluk, Bovornpratch van der Werf, Paul Werner, Norbert Witstok, Joris Xiao, Mengyuan Astrophysics of Galaxies We present deep ALMA Band 7 observations of the [OIII] $88μ$m line and underlying dust continuum emission in four UV-bright, gravitationally lensed (magnification $μ= 1.4-3.8$), JWST-selected galaxies at $z = 8.5 - 10.3$, with observed magnitudes $-22.5 \lesssim M_\mathrm{UV} \lesssim -20.5$. [OIII] $88μ$m is confidently detected in UNCOVER-10646 at $z=8.5080 \pm 0.0011$ ($15σ$) and DHZ1 at $z=9.3113 \pm 0.0005$ ($6σ$), with both being intrinsically luminous systems [$L_\mathrm{[OIII]} = (1.1 - 1.6) \times 10^9$ $L_\odot$] that follow the local [OIII]-SFR relation. [OIII] $88μ$m remains undetected in the two $z>10$ targets, including in the $z=10.07$ X-ray AGN UHZ1, where we obtain a deep limit of $L_\mathrm{[OIII]} < 6 \times 10^7$ $L_\odot$. Dust emission is not detected in any individual source nor in a stack ($<3σ$). The high S/N [OIII] $88μ$m detection in UNCOVER-10646 uniquely reveals an additional broad component ($\mathrm{FWHM} = 1366_{-329}^{+473}$ $\mathrm{km/s}$; $Δ\mathrm{BIC}\approx20$) indicative of an ionized outflow. We infer a high outflow rate of $\dot{M}_\mathrm{out} = 128_{-46}^{+80}$ $M_\odot\mathrm{yr}^{-1}$, corresponding to a mass loading factor $η= \dot{M}_\mathrm{out}/\mathrm{SFR} = 2.9_{-1.0}^{+1.8}$ that is broadly consistent with theoretical predictions and JWST-based studies of ionized outflows at high redshift. While high-resolution ALMA follow-up is required to confirm the outflow, this first systematic study at $z>8$ highlights the unique diagnostic power of [OIII] $88μ$m in characterizing galaxies in the early Universe. |
| title | A first systematic study of [OIII] 88$μ$m at $z>8$: two luminous oxygen lines and a powerful ionized outflow in the first 600 million years |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2512.14486 |