Tokuoka, Tsuyoshi;
Inoue, Akio K;
Hashimoto, Takuya;
Ellis, Richard S;
Laporte, Nicolas;
Sugahara, Yuma;
Matsuo, Hiroshi;
... Zheng, Wei; + view all
(2022)
Possible Systematic Rotation in the Mature Stellar Population of a z = 9.1 Galaxy.
The Astrophysical Journal Letters
, 933
(1)
, Article L19. 10.3847/2041-8213/ac7447.
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Abstract
We present new observations with the Atacama Large Millimeter/submillimeter Array for a gravitationally lensed galaxy at z = 9.1, MACS1149-JD1. [O iii] 88 μm emission is detected at 10σ with a spatial resolution of ∼0.3 kpc in the source plane, enabling the most distant morphokinematic study of a galaxy. The [O iii] emission is distributed smoothly without any resolved clumps and shows a clear velocity gradient with ΔVobs/2σtot = 0.84 ± 0.23, where ΔVobs is the observed maximum velocity difference and σtot is the velocity dispersion measured in the spatially integrated line profile, suggesting a rotating system. Assuming a geometrically thin self-gravitating rotation disk model, we obtain ${V}_{\mathrm{rot}}/{\sigma }_{V}={0.67}_{-0.26}^{+0.73}$, where Vrot and σV are the rotation velocity and velocity dispersion, respectively, still consistent with rotation. The resulting disk mass of ${0.65}_{-0.40}^{+1.37}\times {10}^{9}$ M⊙ is consistent with being associated with the stellar mass identified with a 300 Myr old stellar population independently indicated by a Balmer break in the spectral energy distribution. We conclude that the most of the dynamical mass is associated with the previously identified mature stellar population that formed at z ∼ 15.
| Type: | Article |
|---|---|
| Title: | Possible Systematic Rotation in the Mature Stellar Population of a z = 9.1 Galaxy |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/2041-8213/ac7447 |
| Publisher version: | https://doi.org/10.3847/2041-8213/ac7447 |
| Language: | English |
| Additional information: | Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (http://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. |
| UCL classification: | UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS UCL |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10152048 |
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