articleAstronomy and AstrophysicsJan 25, 2024DIAMOND OA

Ionised gas kinematics and dynamical masses of z ≳ 6 galaxies from JADES/NIRSpec high-resolution spectroscopy

ADAnna de GraaffHRHans‐Walter RixSCStefano CarnianiKAKatherine A. SuessSCS. Charlot

Max Planck Institute for Astronomy · Scuola Normale Superiore · +22 more institutions

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Abstract

We explore the kinematic gas properties of six 5.5 < z < 7.4 galaxies in the JWST Advanced Deep Extragalactic Survey (JADES), using high-resolution JWST/NIRSpec multi-object spectroscopy of the rest-frame optical emission lines [O III ] and H α . The objects are small and of low stellar mass (∼1 kpc; M * ∼ 10 7 − 9 M ⊙ ), less massive than any galaxy studied kinematically at z > 1 thus far. The cold gas masses implied by the observed star formation rates are about ten times higher than the stellar masses. We find that their ionised gas is spatially resolved by JWST, with evidence for broadened lines and spatial velocity gradients. Using a simple thin-disc model, we fit these data with a novel…

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Topics
Keywords
  • Physics
  • Astrophysics
  • Galaxy
  • Velocity dispersion
  • Stars
  • Astronomy
  • Star formation
  • Line (geometry)
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