English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present new observations with the Atacama Large Millimeter/submillimeterArray for a gravitationally-lensed galaxy at $z=9.1$, MACS1149-JD1. [O III]88-$\mu$m emission is detected at 10$\sigma$ with a spatial resolution of$\sim0.3$ kpc in the source plane, enabling the most distant morpho-kinematicstudy of a galaxy. The [O III] emission is distributed smoothly without anyresolved clumps and shows a clear velocity gradient with $\Delta V_{\rmobs}/2\sigma_{\rm tot}=0.84\pm0.23$, where $\Delta V_{\rm obs}$ is the observedmaximum velocity difference and $\sigma_{\rm tot}$ is the velocity dispersionmeasured in the spatially-integrated line profile, suggesting a rotatingsystem. Assuming a geometrically thin self-gravitating rotation disk model, weobtain $V_{\rm rot}/\sigma_V=0.67_{-0.26}^{+0.73}$, where $V_{\rm rot}$ and$\sigma_V$ are the rotation velocity and velocity dispersion, respectively,still consistent with rotation. The resulting disk mass of$0.65_{-0.40}^{+1.37}\times10^{9}$ M$_\odot$ is consistent with beingassociated with the stellar mass identified with a 300 Myr-old stellarpopulation independently indicated by a Balmer break in the spectral energydistribution. We conclude that the most of the dynamical mass is associatedwith the previously-identified mature stellar population that formed at$z\sim15$.

Possible Systematic Rotation in the Mature Stellar Population of a $z=9.1$ Galaxy