Abstract
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 ΔV
obs/2σ
tot = 0.84 ± 0.23, where ΔV
obs is the observed maximum velocity difference and σ
tot 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
rot
/
σ
V
=
0.67
−
0.26
+
0.73
, where V
rot and σ
V
are the rotation velocity and velocity dispersion, respectively, still consistent with rotation. The resulting disk mass of
0.65
−
0.40
+
1.37
×
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.
Funder
National Astronomical Observatory of Japan
Ministry of Education, Culture, Sports, Science and Technology
MEXT ∣ Japan Society for the Promotion of Science
EC ∣ European Research Council
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
7 articles.
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