Discovery of a new N-emitter in the epoch of reionization
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arXiv
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2024
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| author | Schaerer, D. Marques-Chaves, R. Xiao, M. Korber, D. |
| author_facet | Schaerer, D. Marques-Chaves, R. Xiao, M. Korber, D. |
| contents | We report the discovery of a compact star-forming galaxy at $z=9.380$ in the GOODS-North field (named GN-z9p4) which shows numerous strong UV-optical emission lines and a single UV line, NIV] 1486. This makes GN-z9p4 the third-highest redshift N-emitter known to date. We determine the nebular abundances of H, C, N, O and Ne, size, and other physical properties of this object, and compare them to those of the other N-emitters known so far and to other star-forming galaxies. Using the direct method we find a metallicity 12+log(O/H)$=7.37 \pm 0.15$, one of the lowest among the N-emitters. The N/O abundance ratio is highly super-solar, and C/O and Ne/O normal compared to other galaxies at low metallicity. We show that the compactness of GN-z9p4 (with effective radius $118\pm16$ pc at 2 micron) and other N-emitters translates into very high stellar mass and SFR surface densities, which could be a criterium to identify other N-emitters. Future studies and larger samples are needed to understand these recently discovered, rare, and enigmatic objects. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_08408 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discovery of a new N-emitter in the epoch of reionization Schaerer, D. Marques-Chaves, R. Xiao, M. Korber, D. Astrophysics of Galaxies We report the discovery of a compact star-forming galaxy at $z=9.380$ in the GOODS-North field (named GN-z9p4) which shows numerous strong UV-optical emission lines and a single UV line, NIV] 1486. This makes GN-z9p4 the third-highest redshift N-emitter known to date. We determine the nebular abundances of H, C, N, O and Ne, size, and other physical properties of this object, and compare them to those of the other N-emitters known so far and to other star-forming galaxies. Using the direct method we find a metallicity 12+log(O/H)$=7.37 \pm 0.15$, one of the lowest among the N-emitters. The N/O abundance ratio is highly super-solar, and C/O and Ne/O normal compared to other galaxies at low metallicity. We show that the compactness of GN-z9p4 (with effective radius $118\pm16$ pc at 2 micron) and other N-emitters translates into very high stellar mass and SFR surface densities, which could be a criterium to identify other N-emitters. Future studies and larger samples are needed to understand these recently discovered, rare, and enigmatic objects. |
| title | Discovery of a new N-emitter in the epoch of reionization |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2406.08408 |