JWST evidence for a sharp "Cosmic Daybreak" at z = 15

arXiv:2609.28257 · astro-ph.CO, astro-ph.GA · Submitted 2026-09-23 · Read on arXiv

astro-ph.CO, astro-ph.GA

Submitted: 2026-09-23

Updated: 2026-09-27

Terminology

• Abundance — 5× in this paper · explained in 1 episode
• AGN — 2× in this paper · explained in 1 episode
• Benchmark — 2× in this paper · explained in 2 episodes
• Calibration — 2× in this paper · explained in 7 episodes
• National Science and Technology Council — 2× in this paper
• Adam — 1× in this paper · explained in 2 episodes
• Clustering — 1× in this paper · explained in 2 episodes
• Matter Power Spectrum — 1× in this paper · explained in 2 episodes
• Metallicity — 1× in this paper · explained in 3 episodes
• Microlensing — 1× in this paper · explained in 2 episodes
• Warm Dark Matter (WDM) — 1× in this paper · explained in 3 episodes

Sources

• CAPERS Observations of Two UV-Bright Galaxies at z>10. More Evidence for Bursting Star Formation in the Early Universe
• Ionizing Photon Production Efficiencies and Chemical Abundances at Cosmic Dawn Revealed by Ultra-Deep Rest-Frame Optical Spectroscopy of JADES-GS-z14-0
• JADES NIRSpec Spectroscopy of GN-z11: Lyman-$\alpha$ emission and possible enhanced nitrogen abundance in a $z=10.60$ luminous galaxy
• Spectroscopic confirmation of two luminous galaxies at $z\sim14$
• Spectroscopic confirmation of a large and luminous galaxy with weak emission lines at $\mathbf{z = 13.53}$
• JWST Spectroscopic Insights Into the Diversity of Galaxies in the First 500 Myr: Short-Lived Snapshots Along a Common Evolutionary Pathway
• The JWST Spectroscopic Properties of Galaxies at $z=9-14$
• JADES: Carbon-enhanced, Nitrogen-normal compact galaxy at z=11.2
• Star Formation under a Cosmic Microscope: Highly magnified z = 11 galaxy behind the Bullet Cluster
• A UV-Luminous Galaxy at z=11 with Surprisingly Weak Star Formation Activity
• JWST Advanced Deep Extragalactic Survey (JADES) Data Release 5: Photometrically Selected Galaxy Candidates at z > 8
• Exploring Cosmic Dawn with PANORAMIC I: The Bright End of the UVLF at $z\sim9 -17$
• EPOCHS-DR2 I: Expanded data release and properties of 6.5<z<16.5 photometrically selected galaxies across NIRCam deep fields covering about700, arcmin squared with the galfind software
• The rise of the galactic empire: luminosity functions at $z\sim17$ and $z\sim25$ estimated with the MIDIS$+$NGDEEP ultra-deep JWST/NIRCam dataset
• NOEMA reveals the true nature of luminous red JWST z>10 galaxy candidates
• Pushing JWST to the extremes: search and scrutiny of bright galaxy candidates at z$\simeq$15-30
• A search for the first galaxies across $>0.6$ deg$^2$ of JWST imaging: new evidence for a rapid decline in star-formation activity at $z>12$
• Ultra High-Redshift or Closer-by, Dust-Obscured Galaxies? Deciphering the Nature of Faint, Previously Missed F200W-Dropouts in CEERS
• Confirmation and refutation of very luminous galaxies in the early universe

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