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Preprint Oct 2026

Discovery of a Broad-Line Active Galactic Nucleus at $z = 9.98$

The James Webb Space Telescope (JWST) has uncovered a previously unexplored population of faint active galactic nuclei (AGNs) in the early Universe. We present MoM-BL-z10 at $z=9.9837\pm0.0009$, identified through a systematic search for broad-line AGNs at $z\geq6$ using public JWST/NIRSpec PRISM spectra from the DAWN...

Xing-Yao Cai, A. Inoue, M. Onoue et al. · 0 citations
Preprint Oct 2026

PRISMS GHZ8: Evidence for a Young Burst and Potential Merger Activity at z=10.23

UV-bright galaxies in the early Universe provide important constraints on the rapid build-up of stellar mass and the sources responsible for cosmic reionization. However, the physical processes that drive their high UV luminosities remain unclear. Here we report JWST/MIRI LRS spectroscopy of GHZ8, a UV-bright galaxy at...

R. Lin, Jorge A. Zavala, J. Álvarez-Márquez et al. · 0 citations

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