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| Natura: | Preprint |
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2024
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| Accesso online: | https://arxiv.org/abs/2412.15027 |
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| _version_ | 1866914365910810624 |
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| author | Jones, Gareth C. Bowler, Rebecca A. A. Bunker, Andrew J. Curti, Mirko Arribas, Santiago Carniani, Stefano Charlot, Stephane Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris J. Chevallard, Jacopo Cresci, Giovanni Parlanti, Eleonora Scholtz, Jan Venturi, Giacomo |
| author_facet | Jones, Gareth C. Bowler, Rebecca A. A. Bunker, Andrew J. Curti, Mirko Arribas, Santiago Carniani, Stefano Charlot, Stephane Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris J. Chevallard, Jacopo Cresci, Giovanni Parlanti, Eleonora Scholtz, Jan Venturi, Giacomo |
| contents | We present JWST/NIRSpec IFU observations of the z=7.152 galaxy system B14-65666, as part of the GA-NIFS survey. Line and continuum emission in this massive system (log10(M*/Msol)=9.8+/-0.2) is resolved into two strong cores surrounded by diffuse emission, as seen in recent JWST/NIRCam imaging. Our dataset contains detections of [OII]3726,3729, [NeIII]3869,3968, Balmer lines, [OIII]4959,5007, HeI5875, and weak [OIII]4363. Each spectrum is fit with a model that consistently incorporates interstellar medium conditions (i.e., electron temperature, Te, electron density, ne, and colour excess, E(B-V)). The resulting line fluxes are used to constrain the gas-phase metallicity (Zg~0.2-0.3 solar) and HBeta-based SFR for each region. Common line ratio diagrams (O32-R23, R3-R2, Ne3O2-R23) reveal that each line-emitting region lies at the intersection of low- and high-redshift galaxies, suggesting low ionisation and higher metallicity compared to the predominantly lower-mass galaxies studied with the JWST/NIRSpec IFU so far at z>5.5. Spaxel-by-spaxel fits reveal evidence for both narrow (FWHM<400 km s-1) and broad (FWHM>500 km s-1) line emission, the latter of which likely represents tidal interaction or outflows. Comparison to ALMA [CII]158um and [OIII]88um data shows a similar velocity structure, and we explore optical-far-infrared diagnostics. The two core galaxies both lie on the mass-metallicity relation at z>4, but show contrasting properties (e.g., M*, Zg), suggesting distinct evolutionary pathways. Combining the NIRSpec IFU and ALMA datasets, our analysis opens new windows into the merging system B14-65666. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_15027 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GA-NIFS: interstellar medium properties and tidal interactions in the evolved massive merging system B14-65666 at z=7.152 Jones, Gareth C. Bowler, Rebecca A. A. Bunker, Andrew J. Curti, Mirko Arribas, Santiago Carniani, Stefano Charlot, Stephane Perna, Michele Del Pino, Bruno Rodríguez Übler, Hannah Willott, Chris J. Chevallard, Jacopo Cresci, Giovanni Parlanti, Eleonora Scholtz, Jan Venturi, Giacomo Astrophysics of Galaxies We present JWST/NIRSpec IFU observations of the z=7.152 galaxy system B14-65666, as part of the GA-NIFS survey. Line and continuum emission in this massive system (log10(M*/Msol)=9.8+/-0.2) is resolved into two strong cores surrounded by diffuse emission, as seen in recent JWST/NIRCam imaging. Our dataset contains detections of [OII]3726,3729, [NeIII]3869,3968, Balmer lines, [OIII]4959,5007, HeI5875, and weak [OIII]4363. Each spectrum is fit with a model that consistently incorporates interstellar medium conditions (i.e., electron temperature, Te, electron density, ne, and colour excess, E(B-V)). The resulting line fluxes are used to constrain the gas-phase metallicity (Zg~0.2-0.3 solar) and HBeta-based SFR for each region. Common line ratio diagrams (O32-R23, R3-R2, Ne3O2-R23) reveal that each line-emitting region lies at the intersection of low- and high-redshift galaxies, suggesting low ionisation and higher metallicity compared to the predominantly lower-mass galaxies studied with the JWST/NIRSpec IFU so far at z>5.5. Spaxel-by-spaxel fits reveal evidence for both narrow (FWHM<400 km s-1) and broad (FWHM>500 km s-1) line emission, the latter of which likely represents tidal interaction or outflows. Comparison to ALMA [CII]158um and [OIII]88um data shows a similar velocity structure, and we explore optical-far-infrared diagnostics. The two core galaxies both lie on the mass-metallicity relation at z>4, but show contrasting properties (e.g., M*, Zg), suggesting distinct evolutionary pathways. Combining the NIRSpec IFU and ALMA datasets, our analysis opens new windows into the merging system B14-65666. |
| title | GA-NIFS: interstellar medium properties and tidal interactions in the evolved massive merging system B14-65666 at z=7.152 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.15027 |