ASTROPHYSICS TELEMETRY: ALL 18 GLOBAL OBSERVATORY NODES NOMINAL
Astrophysics Research Crest
ASTROPHYSICS

Center for Deep Space Research

Spectroscopic Confirmation of Luminous High-Redshift Galaxies at z > 14 with JWST/NIRSpec
CosmologyThe Astrophysical Journal Letters, Vol. 968, L14

Spectroscopic Confirmation of Luminous High-Redshift Galaxies at z > 14 with JWST/NIRSpec

Dr. Eleanor Vance, Ph.D.; Prof. Marcus Thorne; Dr. Alistair Chen; Harvard Astrophysics Consortium
Harvard Center for Astrophysics & STScI
DOI: 10.3847/2041-8213/ad36e1 • Published: January 2025

Abstract

We present deep NIRSpec prism and grating spectroscopy targeting candidate ultra-high-redshift systems identified in the GOODS-S / JADES field. We definitively confirm the Lyman break and rest-frame ultraviolet emission lines of JADES-GS-z14-0 at a spectroscopic redshift of z = 14.320 ± 0.008, corresponding to an era just 290 million years post-Big Bang. The stellar mass (~5 × 10⁸ M☉) and ionizing UV luminosity imply unexpectedly rapid early starburst efficiencies and low dust attenuation.

Key Scientific Findings

Spectroscopic redshift confirmation at z = 14.32 via distinct Lyman-alpha continuum break detection.
High UV continuum luminosity (M_UV = -20.8) indicating star formation rates exceeding 20 M☉/year without severe dust quenching.
Evidence for early chemical enrichment with significant C III] and [O III] detections, challenging canonical Population III starburst models.

Figures & Spectral Reductions

Figure 1
Figure 1:Calibrated 1D flux spectrum showing steep Lyman break cutoff at 1.86 microns.
Figure 2
Figure 2:Multi-band NIRCam imaging stamps showing compact morphology with half-light radius r_e < 260 pc.
Figure 3
Figure 3:Cosmological star formation rate density evolutionary curves compared against hydrodynamical IllustrisTNG models.

BibTeX Citation

@article{Vance2025EarlyGalaxies,
  author = {Vance, E. and Thorne, M. and Chen, A.},
  title = {Spectroscopic Confirmation of Luminous High-Redshift Galaxies at z > 14 with JWST/NIRSpec},
  journal = {The Astrophysical Journal Letters},
  volume = {968},
  pages = {L14},
  year = {2025},
  doi = {10.3847/2041-8213/ad36e1}
}