Detection of the [O <scp>i</scp>] 63 µm emission line from the <i>z</i> = 6.04 quasar J2054–0005

Abstract We report the highest-redshift detection of [O i] 63 $\mu$m from a luminous quasar, J2054$-$0005, at $z=6.04$ based on the Atacama Large Millimeter/sub-millimeter Array (ALMA) Band 9 observations. The [O i] 63 $\mu$m line luminosity is $(4.5\pm 1.5) \times 10^{9} L_{\odot }$, corresponding to the [O i] 63 $\mu$m-to-far-infrared luminosity ratio of $\approx$6.7 $\times 10^{-4}$, which is consistent with the value obtained in the local Universe. Remarkably, [O i] 63 $\mu$m is as bright as [C ii] 158 $\mu$m, resulting in the [O i]-to-[C ii] line luminosity ratio of $1.3\pm 0.5$. Based on a careful comparison of the luminosity ratios of [O i] 63 $\mu$m, [C ii] 158 $\mu$m, and dust continuum emission to models of photodissociation regions, we find that J2054$-$0005 has a gas density $\log (n_{\rm H}/{\rm cm}^{-3}) = 3.7\pm 0.3$ and an incident far-ultraviolet radiation field of $\log (G/G_{\rm 0}) = 3.0\pm 0.1$, showing that [O i] 63 $\mu$m serves as an important coolant of the dense and warm gas in J2054$-$0005. A close examination of the [O i] and [C ii] line profiles suggests that the [O i] line may be partially self-absorbed; however, deeper observations are needed to verify this conclusion. Regardless, the gas density and incident radiation field are in broad agreement with the values obtained in nearby star-forming galaxies and objects with [O i] 63 $\mu$m observations at $z=1$–3 with the Herschel Space Observatory. These results demonstrate the power of ALMA high-frequency observations targeting [O i] 63 $\mu$m to examine the properties of photodissociation regions in high-redshift galaxies.

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Journal
Publications of the Astronomical Society of Japan
Published
2024-11-26
DOI
https://doi.org/10.1093/pasj/psae105
Citations
5
Primary Topic
Galaxies: Formation, Evolution, Phenomena
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article
Field-Weighted Citation Impact
1.66

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article

Detection of the [O i] 63 µm emission line from the z = 6.04 quasar J2054–0005

Takuma Izumi, Seiji Fujimoto, Dragan Salak, Yurina Nakazato et al.
5 citations
Publications of the Astronomical Society of Japan
Galaxies: Formation, Evolution, Phenomena
1.66
article

Detection of the [O i] 63 µm emission line from the z = 6.04 quasar J2054–0005

Takuma Izumi, Seiji Fujimoto, Dragan Salak, Yurina Nakazato, Fabian Walter, Yoichi Tamura, Hidenobu Yajima, Yuma Sugahara, Matus Rybak, Mitsutaka Usui, Nario Kuno, Tohru Nagao, R. A. Meyer, Carl Ferkinhoff, Hiroshi Matsuo, D. Donevski, Ken Mawatari, Takuya Hashimoto, Tomonari Michiyama, Yoshinobu Fudamoto, Akio Inoue, Naoki Yoshida, Tom J. L. C. Bakx, Wataru Osone, Koki Wakasugi, Nozomi Ishii
article en
5 citations

Abstract

Abstract We report the highest-redshift detection of [O i] 63 $\mu$m from a luminous quasar, J2054$-$0005, at $z=6.04$ based on the Atacama Large Millimeter/sub-millimeter Array (ALMA) Band 9 observations. The [O i] 63 $\mu$m line luminosity is $(4.5\pm 1.5) \times 10^{9} L_{\odot }$, corresponding to the [O i] 63 $\mu$m-to-far-infrared luminosity ratio of $\approx$6.7 $\times 10^{-4}$, which is consistent with the value obtained in the local Universe. Remarkably, [O i] 63 $\mu$m is as bright as [C ii] 158 $\mu$m, resulting in the [O i]-to-[C ii] line luminosity ratio of $1.3\pm 0.5$. Based on a careful comparison of the luminosity ratios of [O i] 63 $\mu$m, [C ii] 158 $\mu$m, and dust continuum emission to models of photodissociation regions, we find that J2054$-$0005 has a gas density $\log (n_{\rm H}/{\rm cm}^{-3}) = 3.7\pm 0.3$ and an incident far-ultraviolet radiation field of $\log (G/G_{\rm 0}) = 3.0\pm 0.1$, showing that [O i] 63 $\mu$m serves as an important coolant of the dense and warm gas in J2054$-$0005. A close examination of the [O i] and [C ii] line profiles suggests that the [O i] line may be partially self-absorbed; however, deeper observations are needed to verify this conclusion. Regardless, the gas density and incident radiation field are in broad agreement with the values obtained in nearby star-forming galaxies and objects with [O i] 63 $\mu$m observations at $z=1$–3 with the Herschel Space Observatory. These results demonstrate the power of ALMA high-frequency observations targeting [O i] 63 $\mu$m to examine the properties of photodissociation regions in high-redshift galaxies.

Publications of the Astronomical Society of JapanVol. 77(1)
University of Geneva (CH), Leiden University (NL), Scuola Internazionale Superiore di Studi Avanzati (IT), University of Tsukuba (JP), Waseda University (JP), Chiba University (JP), The Graduate University for Advanced Studies, SOKENDAI (JP), Hokkaido University (JP), Institute for Advanced Study (US), Max Planck Institute for Astronomy (DE), National Astronomical Observatory of Japan (JP), Ehime University (JP), Space Research Organisation Netherlands (NL), Winona State University (US), Nagoya University (JP), Chalmers University of Technology (SE), The University of Tokyo (JP), The University of Texas at Austin (US), Delft University of Technology (NL)
Japan Society for the Promotion of Science London, Ministry of Education, Culture, Sports, Science and Technology, National Astronomical Observatory of Japan, Japan Society for the Promotion of Science
Openalex Percentile: Top 16%
Galaxies: Formation, Evolution, Phenomena
1.66
DOISourceOpenAlex
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