JADES and SAPPHIRES: Galaxy Metamorphosis Amidst a Huge, Luminous Emission-line Region
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| Format: | Preprint |
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2025
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| author | D'Eugenio, Francesco Helton, Jakob M. Hainline, Kevin Sun, Fengwu Maiolino, Roberto Pérez-González, Pablo G. Juodžbalis, Ignas Arribas, Santiago Bunker, Andrew J. Carniani, Stefano Curtis-Lake, Emma Egami, Eiichi Eisenstein, Daniel J. Johnson, Benjamin D. Robertson, Brant Tacchella, Sandro Willmer, Christopher N. A. Willott, Chris Baker, William M. Danhaive, A. Lola Duan, Qiao Fudamoto, Yoshinobu Jones, Gareth C. Lin, Xiaojing Liu, Weizhe Perna, Michele Puskás, Dávid Rinaldi, Pierluigi Scholtz, Jan Sun, Yang Trussler, James A. A. Übler, Hannah Venturi, Giacomo Williams, Christina C. Zhu, Yongda |
| author_facet | D'Eugenio, Francesco Helton, Jakob M. Hainline, Kevin Sun, Fengwu Maiolino, Roberto Pérez-González, Pablo G. Juodžbalis, Ignas Arribas, Santiago Bunker, Andrew J. Carniani, Stefano Curtis-Lake, Emma Egami, Eiichi Eisenstein, Daniel J. Johnson, Benjamin D. Robertson, Brant Tacchella, Sandro Willmer, Christopher N. A. Willott, Chris Baker, William M. Danhaive, A. Lola Duan, Qiao Fudamoto, Yoshinobu Jones, Gareth C. Lin, Xiaojing Liu, Weizhe Perna, Michele Puskás, Dávid Rinaldi, Pierluigi Scholtz, Jan Sun, Yang Trussler, James A. A. Übler, Hannah Venturi, Giacomo Williams, Christina C. Zhu, Yongda |
| contents | We report the discovery of a remarkably large and luminous line-emitting nebula extending on either side of the Balmer-break galaxy JADES-GS-518794 at z=5.89, detected with JADES JWST/NIRCam imaging in [O III]$λλ$4959,5007 and H$α$ and spectroscopically confirmed with NIRCam/WFSS thanks to the pure-parallel SAPPHIRES programme. The end-to-end velocity offset is $Δv=830\pm130$ km s$^{-1}$. Nebulae with such large size and high luminosity (25-pkpc diameter, L[O III] = $1.2\times 10^{10}$ L$_\odot$) are routinely observed around bright quasars, unlike JADES-GS-518794. With a stellar mass of $10^{10.1}$ M$_\odot$, this galaxy is at the knee of the mass function at z=6. Its star-formation rate declined for some time (10-100 Myr prior to observation), followed by a recent (10 Myr) upturn. This system is part of a candidate large-scale galaxy overdensity, with an excess of Balmer-break galaxies compared to the field (3 $σ$). We discuss the possible origin of this nebula as material from a merger or gas expelled by an active galactic nucleus (AGN). The symmetry of the nebula, its bubble-like morphology, kinematics, high luminosity, and the extremely high equivalent width of [OIII] together favour the AGN interpretation. Intriguingly, there may be a physical connection between the presence of such a large, luminous nebula and the possible metamorphosis of the central galaxy towards quenching. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_15590 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JADES and SAPPHIRES: Galaxy Metamorphosis Amidst a Huge, Luminous Emission-line Region D'Eugenio, Francesco Helton, Jakob M. Hainline, Kevin Sun, Fengwu Maiolino, Roberto Pérez-González, Pablo G. Juodžbalis, Ignas Arribas, Santiago Bunker, Andrew J. Carniani, Stefano Curtis-Lake, Emma Egami, Eiichi Eisenstein, Daniel J. Johnson, Benjamin D. Robertson, Brant Tacchella, Sandro Willmer, Christopher N. A. Willott, Chris Baker, William M. Danhaive, A. Lola Duan, Qiao Fudamoto, Yoshinobu Jones, Gareth C. Lin, Xiaojing Liu, Weizhe Perna, Michele Puskás, Dávid Rinaldi, Pierluigi Scholtz, Jan Sun, Yang Trussler, James A. A. Übler, Hannah Venturi, Giacomo Williams, Christina C. Zhu, Yongda Astrophysics of Galaxies We report the discovery of a remarkably large and luminous line-emitting nebula extending on either side of the Balmer-break galaxy JADES-GS-518794 at z=5.89, detected with JADES JWST/NIRCam imaging in [O III]$λλ$4959,5007 and H$α$ and spectroscopically confirmed with NIRCam/WFSS thanks to the pure-parallel SAPPHIRES programme. The end-to-end velocity offset is $Δv=830\pm130$ km s$^{-1}$. Nebulae with such large size and high luminosity (25-pkpc diameter, L[O III] = $1.2\times 10^{10}$ L$_\odot$) are routinely observed around bright quasars, unlike JADES-GS-518794. With a stellar mass of $10^{10.1}$ M$_\odot$, this galaxy is at the knee of the mass function at z=6. Its star-formation rate declined for some time (10-100 Myr prior to observation), followed by a recent (10 Myr) upturn. This system is part of a candidate large-scale galaxy overdensity, with an excess of Balmer-break galaxies compared to the field (3 $σ$). We discuss the possible origin of this nebula as material from a merger or gas expelled by an active galactic nucleus (AGN). The symmetry of the nebula, its bubble-like morphology, kinematics, high luminosity, and the extremely high equivalent width of [OIII] together favour the AGN interpretation. Intriguingly, there may be a physical connection between the presence of such a large, luminous nebula and the possible metamorphosis of the central galaxy towards quenching. |
| title | JADES and SAPPHIRES: Galaxy Metamorphosis Amidst a Huge, Luminous Emission-line Region |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.15590 |