GA-NIFS: ISM properties and metal enrichment in a merger-driven starburst during the Epoch of Reionisation probed with JWST and ALMA
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| Natura: | Preprint |
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2024
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| author | Scholtz, J. Curti, M. D'Eugenio, F. Übler, H. Maiolino, R. Marconcini, C. Smit, R. Perna, M. Witstok, J. Arribas, S. Böker, T. Bunker, A. J. Carniani, S. Charlot, S. Cresci, G. Pérez-González, P. G. Lamperti, I. Del Pino, B. Rodríguez Parlanti, E. Venturi, G. |
| author_facet | Scholtz, J. Curti, M. D'Eugenio, F. Übler, H. Maiolino, R. Marconcini, C. Smit, R. Perna, M. Witstok, J. Arribas, S. Böker, T. Bunker, A. J. Carniani, S. Charlot, S. Cresci, G. Pérez-González, P. G. Lamperti, I. Del Pino, B. Rodríguez Parlanti, E. Venturi, G. |
| contents | We present deep JWST/NIRSpec integral-field spectroscopy (IFS) and ALMA [CII]$λ$158$μ$m observations of COS-3018, a star-forming galaxy at z$\sim$6.85, as part of the GA-NIFS programme. Both G395H (R$\sim$ 2700) and PRISM (R$\sim$ 100) NIRSpec observations revealed that COS-3018 is comprised of three separate components detected in [OIII]$λ$5008, which we dub as Main, North and East, with stellar masses of 10$^{9.4 \pm 0.1}$, 10$^{9.2 \pm 0.07}$, 10$^{7.7 \pm 0.15}$ M$_{\odot}$. We detect [OIII]$λ$5008, [OIII]$λλ$3727,29 and multiple Balmer lines in all three components together with [OIII]$λ$4363 in the Main and North components. This allows us to measure an ISM temperature of T$_{e}$= 1.27$\pm0.07\times 10^4$ and T$_{e}$= 1.6$\pm0.14\times 10^4$ K with densities of $n_{e}$ = 1250$\pm$250 and $n_{e}$ = 700$\pm$200 cm$^{-3}$, respectively. These deep observations allow us to measure an average metallicity of 12+log(O/H)=7.9--8.2 for the three components with the T$_{e}$-method. We do not find any significant evidence of metallicity gradients between the components. Furthermore, we also detect [NII]$λ$6585, one of the highest redshift detections of this emission line. We find that in a small, metal-poor clump 0.2 arcsec west of the North component, N/O is elevated compared to other regions, indicating that nitrogen enrichment originates from smaller substructures, possibly proto-globular clusters. [OIII]$λ$5008 kinematics show that this system is merging, which is probably driving the ongoing, luminous starburst. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_07695 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GA-NIFS: ISM properties and metal enrichment in a merger-driven starburst during the Epoch of Reionisation probed with JWST and ALMA Scholtz, J. Curti, M. D'Eugenio, F. Übler, H. Maiolino, R. Marconcini, C. Smit, R. Perna, M. Witstok, J. Arribas, S. Böker, T. Bunker, A. J. Carniani, S. Charlot, S. Cresci, G. Pérez-González, P. G. Lamperti, I. Del Pino, B. Rodríguez Parlanti, E. Venturi, G. Astrophysics of Galaxies We present deep JWST/NIRSpec integral-field spectroscopy (IFS) and ALMA [CII]$λ$158$μ$m observations of COS-3018, a star-forming galaxy at z$\sim$6.85, as part of the GA-NIFS programme. Both G395H (R$\sim$ 2700) and PRISM (R$\sim$ 100) NIRSpec observations revealed that COS-3018 is comprised of three separate components detected in [OIII]$λ$5008, which we dub as Main, North and East, with stellar masses of 10$^{9.4 \pm 0.1}$, 10$^{9.2 \pm 0.07}$, 10$^{7.7 \pm 0.15}$ M$_{\odot}$. We detect [OIII]$λ$5008, [OIII]$λλ$3727,29 and multiple Balmer lines in all three components together with [OIII]$λ$4363 in the Main and North components. This allows us to measure an ISM temperature of T$_{e}$= 1.27$\pm0.07\times 10^4$ and T$_{e}$= 1.6$\pm0.14\times 10^4$ K with densities of $n_{e}$ = 1250$\pm$250 and $n_{e}$ = 700$\pm$200 cm$^{-3}$, respectively. These deep observations allow us to measure an average metallicity of 12+log(O/H)=7.9--8.2 for the three components with the T$_{e}$-method. We do not find any significant evidence of metallicity gradients between the components. Furthermore, we also detect [NII]$λ$6585, one of the highest redshift detections of this emission line. We find that in a small, metal-poor clump 0.2 arcsec west of the North component, N/O is elevated compared to other regions, indicating that nitrogen enrichment originates from smaller substructures, possibly proto-globular clusters. [OIII]$λ$5008 kinematics show that this system is merging, which is probably driving the ongoing, luminous starburst. |
| title | GA-NIFS: ISM properties and metal enrichment in a merger-driven starburst during the Epoch of Reionisation probed with JWST and ALMA |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2411.07695 |