RIOJA. Young Starburst and Ionized Gas Outflows in a $z = 7.212$ Galaxy Uncovered by JWST NIRCam and NIRSpec Observations
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| Format: | Preprint |
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2025
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| author | Ren, Yi W. Inoue, Akio K. Álvarez-Márquez, Javier Hashimoto, Takuya Colina, Luis Sugahara, Yuma Costantin, Luca Mawatari, Ken Fudamoto, Yoshinobu Arribas, Santiago Gómez, Alejandro Crespo Ceverino, Daniel Nakazato, Yurina Hagimoto, Masato Usui, Mitsutaka Marques-Chaves, Rui Matsuo, Hiroshi Hashigaya, Takeshi Osone, Wataru Blanco-Prieto, Carmen Tamura, Yoichi Yoshida, Naoki Bakx, Tom J. L. C. Pereira-Santaella, Miguel |
| author_facet | Ren, Yi W. Inoue, Akio K. Álvarez-Márquez, Javier Hashimoto, Takuya Colina, Luis Sugahara, Yuma Costantin, Luca Mawatari, Ken Fudamoto, Yoshinobu Arribas, Santiago Gómez, Alejandro Crespo Ceverino, Daniel Nakazato, Yurina Hagimoto, Masato Usui, Mitsutaka Marques-Chaves, Rui Matsuo, Hiroshi Hashigaya, Takeshi Osone, Wataru Blanco-Prieto, Carmen Tamura, Yoichi Yoshida, Naoki Bakx, Tom J. L. C. Pereira-Santaella, Miguel |
| contents | We present analysis of JWST NIRCam and NIRSpec observations of the galaxy SXDF-NB1006-2 at $z = 7.212$, as part of the Reionization and the ISM/Stellar Origins with JWST and ALMA (RIOJA) project. We derive the physical properties by conducting spectral energy distribution (SED) fitting, revealing that our target is a young (age $\sim2$ Myr) starburst galaxy with intense radiation field. We detect multiple nebular emission lines from NIRSpec IFS data. We identify a robust broad component of [O III]$\lambda5008$ emission, indicating the presence of ionized gas outflows. The derived gas depletion time of a few hundred Myr implies that our target could be one of the progenitors of massive quiescent galaxies at $z\sim4-5$ identified by recent JWST observations. The spatial distribution of optical and far-infrared (FIR) [O III] emission lines differs in morphology, likely resulting from different critical densities and inhomogeneous density distributions within the galaxy. Potential old stellar populations may be necessary to account for the derived metallicity of $\sim0.2\,\rm{Z}_\odot$, and their presence can be confirmed by future MIRI observations. Including our target, star-forming galaxies at $z>6$ detected by ALMA are generally very young but more massive and brighter in UV than galaxies identified by only JWST. The ALMA-detected galaxies may also have a steeper mass-metallicity relation. These findings suggest that the ALMA-detected galaxies may have experienced more efficient mass assembly processes in their evolutionary pathways. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_25721 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | RIOJA. Young Starburst and Ionized Gas Outflows in a $z = 7.212$ Galaxy Uncovered by JWST NIRCam and NIRSpec Observations Ren, Yi W. Inoue, Akio K. Álvarez-Márquez, Javier Hashimoto, Takuya Colina, Luis Sugahara, Yuma Costantin, Luca Mawatari, Ken Fudamoto, Yoshinobu Arribas, Santiago Gómez, Alejandro Crespo Ceverino, Daniel Nakazato, Yurina Hagimoto, Masato Usui, Mitsutaka Marques-Chaves, Rui Matsuo, Hiroshi Hashigaya, Takeshi Osone, Wataru Blanco-Prieto, Carmen Tamura, Yoichi Yoshida, Naoki Bakx, Tom J. L. C. Pereira-Santaella, Miguel Astrophysics of Galaxies We present analysis of JWST NIRCam and NIRSpec observations of the galaxy SXDF-NB1006-2 at $z = 7.212$, as part of the Reionization and the ISM/Stellar Origins with JWST and ALMA (RIOJA) project. We derive the physical properties by conducting spectral energy distribution (SED) fitting, revealing that our target is a young (age $\sim2$ Myr) starburst galaxy with intense radiation field. We detect multiple nebular emission lines from NIRSpec IFS data. We identify a robust broad component of [O III]$\lambda5008$ emission, indicating the presence of ionized gas outflows. The derived gas depletion time of a few hundred Myr implies that our target could be one of the progenitors of massive quiescent galaxies at $z\sim4-5$ identified by recent JWST observations. The spatial distribution of optical and far-infrared (FIR) [O III] emission lines differs in morphology, likely resulting from different critical densities and inhomogeneous density distributions within the galaxy. Potential old stellar populations may be necessary to account for the derived metallicity of $\sim0.2\,\rm{Z}_\odot$, and their presence can be confirmed by future MIRI observations. Including our target, star-forming galaxies at $z>6$ detected by ALMA are generally very young but more massive and brighter in UV than galaxies identified by only JWST. The ALMA-detected galaxies may also have a steeper mass-metallicity relation. These findings suggest that the ALMA-detected galaxies may have experienced more efficient mass assembly processes in their evolutionary pathways. |
| title | RIOJA. Young Starburst and Ionized Gas Outflows in a $z = 7.212$ Galaxy Uncovered by JWST NIRCam and NIRSpec Observations |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2510.25721 |