A solar metallicity galaxy at z > 7? Possible detection of the [N II] 122 mu m and [O III] 52 mu m lines
| Autor: | Meghana Killi, Darach Watson, Seiji Fujimoto, Hollis Akins, Kirsten Knudsen, Johan Richard, Yuichi Harikane, Dimitra Rigopoulou, Francesca Rizzo, Michele Ginolfi, Gergö Popping, Vasily Kokorev |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: |
abundances [ISM]
N/O ABUNDANCE RATIOS ISM [galaxies] INTERSTELLAR-MEDIUM Astronomy and Astrophysics Astrophysics - Astrophysics of Galaxies STAR-FORMATION DUST-CONTINUUM MASS-METALLICITY Space and Planetary Science individual:(A1689-zD1) [galaxies] galaxies [submillimetre] BIG 3 DRAGONS LYMAN-BREAK GALAXY OIII 88-MU-M ALMA PHYSICAL CONDITIONS high-redshift [galaxies] |
| Zdroj: | Killi, M, Watson, D, Fujimoto, S, Akins, H, Knudsen, K, Richard, J, Harikane, Y, Rigopoulou, D, Rizzo, F, Ginolfi, M, Popping, G & Kokorev, V 2023, ' A solar metallicity galaxy at z > 7? Possible detection of the [N II] 122 mu m and [O III] 52 mu m lines ', Monthly Notices of the Royal Astronomical Society, vol. 521, no. 2, pp. 2526-2534 . https://doi.org/10.1093/mnras/stad687 |
| Popis: | We present the first detection of the [N II] 122 $\mu$m and [O III] 52 $\mu$m lines for a reionisation-epoch galaxy. Based on these lines and previous [C II] 158 $\mu$m and [O III] 88 $\mu$m measurements, using two different radiative transfer models of the interstellar medium, we estimate an upper limit on electron density of $\lesssim$ 500 cm$^{-3}$ and a gas-phase metallicity $Z/Z_\odot \sim 1.1 \pm 0.2$ for A1689-zD1, a gravitationally-lensed, dusty galaxy at $z$ = 7.133. Other measurements or indicators of metallicity so far in galaxy interstellar media at $z \gtrsim$ 6 are typically an order of magnitude lower than this. The unusually high metallicity makes A1689-zD1 inconsistent with the fundamental metallicity relation, although there is likely significant dust obscuration of the stellar mass, which may partly resolve the inconsistency. Given a solar metallicity, the dust-to-metals ratio is a factor of several lower than expected, hinting that galaxies beyond $z \sim$ 7 may have lower dust formation efficiency. Finally, the inferred nitrogen enrichment compared to oxygen, on which the metallicity measurement depends, indicates that star-formation in the system is older than about 250 Myr, pushing the beginnings of this galaxy to $z >$ 10. Comment: 10 pages, 7 figures; Published MNRAS: 06 March 2023 |
| Databáze: | OpenAIRE |
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