Papers › JADES and SAPPHIRES: Galaxy Metamorphosis Amidst a Huge, Luminous Emission-line Region
JADES and SAPPHIRES: Galaxy Metamorphosis Amidst a Huge, Luminous Emission-line Region
Francesco D'Eugenio, Jakob M. Helton, Kevin Hainline, Fengwu Sun, Roberto Maiolino, Pablo G. Pérez-González, Ignas Juodžbalis, Santiago Arribas, Andrew J. Bunker, Stefano Carniani, Emma Curtis-Lake, Eiichi Egami, Daniel J. Eisenstein, Benjamin D. Johnson, Brant Robertson, Sandro Tacchella, Christopher N. A. Willmer, Chris Willott, William M. Baker, A. Lola Danhaive, Qiao Duan, Yoshinobu Fudamoto, Gareth C. Jones, Xiaojing Lin, Weizhe Liu, Michele Perna, Dávid Puskás, Pierluigi Rinaldi, Jan Scholtz, Yang Sun, James A. A. Trussler, Hannah Übler, Giacomo Venturi, Christina C. Williams, Yongda Zhu
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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]λλ4959,5007 and Hα and spectroscopically confirmed with NIRCam/WFSS thanks to the pure-parallel SAPPHIRES programme. The end-to-end velocity offset is Δv=830±130 km s⁻¹. Nebulae with such large size and high luminosity (25-pkpc diameter, L[O III] = 1.2×10¹⁰ L_⊙) are routinely observed around bright quasars, unlike JADES-GS-518794. With a stellar mass of 10^(10.1) M_⊙, 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.
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