Detection of the [O i] 63 μm emission line from the z=6.04 quasar J2054-0005
Journal article, 2024

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 +/- 1.5)x10(9)L(circle dot), corresponding to the [O i] 63 mu m-to-far-infrared luminosity ratio of approximate to 6.7 x10(-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 +/- 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(H)/cm(-3))=3.7 +/- 0.3 and an incident far-ultraviolet radiation field of log(G/G(0))=3.0 +/- 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.

galaxies: ISM

quasars: general

galaxies: active

galaxies: high-redshift

Author

Nozomi Ishii

Systems Engineering Consultants (SEC)

University of Tsukuba

Takuya Hashimoto

University of Tsukuba

Carl Ferkinhoff

Winona State University (WSU)

Matus Rybak

Leiden University

Netherlands Institute for Space Research (SRON)

Delft University of Technology

Akio K. Inoue

Waseda University

Tomonari Michiyama

Shunan University

Darko Donevski

National Centre for Nuclear Research

International School for Advanced Studies (SISSA

Seiji Fujimoto

The University of Texas at Austin

Dragan Salak

Hokkaido University

Hiroshi Matsuo

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

University of Tsukuba

Ken Mawatari

University of Tsukuba

Yoichi Tamura

Nagoya University

University of Tsukuba

Takuma Izumi

National Astronomical Observatory of Japan

The Graduate University for Advanced Studies (SOKENDAI)

Tohru Nagao

Ehime University

Yurina Nakazato

University of Tokyo

Wataru Osone

University of Tsukuba

Yuma Sugahara

Waseda University

Mitsutaka Usui

University of Tsukuba

Koki Wakasugi

University of Tsukuba

Hidenobu Yajima

University of Tsukuba

Tom Bakx

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics

Yoshinobu Fudamoto

Chiba University

Romain A. Meyer

University of Geneva

Fabian Walter

Max Planck Society

Naoki Yoshida

University of Tokyo

Publication of the Astronomical Society of Japan

0004-6264 (ISSN) 2053051x (eISSN)

Vol. In Press

Subject Categories (SSIF 2011)

Astronomy, Astrophysics and Cosmology

Atom and Molecular Physics and Optics

DOI

10.1093/pasj/psae105

More information

Latest update

1/13/2025