Detection of nitrogen and oxygen in a galaxy at the end of reionization
| Autor: | Ken-ichi Tadaki, Akiyoshi Tsujita, Yoichi Tamura, Kotaro Kohno, Bunyo Hatsukade, Daisuke Iono, Minju M Lee, Yuichi Matsuda, Tomonari Michiyama, Tohru Nagao, Kouichiro Nakanishi, Yuri Nishimura, Toshiki Saito, Hideki Umehata, Jorge Zavala |
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| Jazyk: | angličtina |
| Rok vydání: | 2022 |
| Předmět: |
SPECTROSCOPY
ISM [galaxies] SUBMILLIMETER GALAXIES INTERSTELLAR-MEDIUM starburst [galaxies] Astrophysics::High Energy Astrophysical Phenomena BILLION YEARS FOS: Physical sciences PREDICTIONS Astronomy and Astrophysics DUSTY Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics - Astrophysics of Galaxies EVOLUTION STARBURSTS Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) STAR-FORMING GALAXIES REDSHIFT DISTRIBUTION Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics high-redshift [galaxies] Astrophysics::Galaxy Astrophysics |
| Zdroj: | Tadaki, K, Tsujita, A, Tamura, Y, Kohno, K, Hatsukade, B, Iono, D, Lee, M M, Matsuda, Y, Michiyama, T, Nagao, T, Nakanishi, K, Nishimura, Y, Saito, T, Umehata, H & Zavala, J 2022, ' Detection of nitrogen and oxygen in a galaxy at the end of reionization ', Publications of the Astronomical Society of Japan, vol. 74, no. 3, pp. L9-L16 . https://doi.org/10.1093/pasj/psac018 |
| Popis: | We present observations of [NII] 205 $\mu$m, [OIII] 88 $\mu$m and dust emission in a strongly-lensed, submillimeter galaxy (SMG) at $z=6.0$, G09.83808, with the Atacama Large Millimeter/submillimeter Array (ALMA). Both [NII] and [OIII] line emissions are detected at $>12\sigma$ in the 0.8$"$-resolution maps. Lens modeling indicates that the spatial distribution of the dust continuum emission is well characterized by a compact disk with an effective radius of 0.64$\pm$0.02 kpc and a high infrared surface brightness of $\Sigma_\mathrm{IR}=(1.8\pm0.3)\times10^{12}~L_\odot$ kpc$^{-2}$. This result supports that G09.83808 is the progenitors of compact quiescent galaxies at $z\sim4$, where the majority of its stars are expected to be formed through a strong and short burst of star formation. G09.83808 and other lensed SMGs show a decreasing trend of the [NII] line to infrared luminosity ratio with increasing continuum flux density ratio between 63 $\mu$m and 158 $\mu$m, as seen in local luminous infrared galaxies (LIRGs). The decreasing trend can be reproduced by photoionization models with increasing ionization parameters. Furthermore, by combining the [NII]/[OIII] luminosity ratio with far-infrared continuum flux density ratio in G09.83808, we infer that the gas phase metallicity is already $Z\approx 0.5-0.7~Z_\odot$. G09.83808 is likely one of the earliest galaxies that has been chemically enriched at the end of reionization. Comment: 8 pages, 5 figures, accepted for publication in PASJ |
| Databáze: | OpenAIRE |
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