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Paper
A long time ago in an LAE far, far away: a signpost of early reionization or a nascent AGN at \\(z=13\\)?
2025
Overview
The JADES survey recently reported the discovery of JADES-GS-z13-1-LA at \\(z = 13\\), the highest redshift Ly\\(\\alpha\\) emitter (LAE) ever observed. This observation suggests that either the intergalactic medium (IGM) surrounding JADES-GS-z13-1-LA is highly ionized, or the galaxy's intrinsic Ly\\(\\alpha\\) emission properties are extreme. We use radiative transfer simulations of reionization that capture the distribution of ionized gas in the \\(z = 13\\) IGM to investigate the implications of JADES-GS-z13-1-LA for reionization. We find that if JADES-GS-z13-1-LA is a typical star forming galaxy (SFG) with properties characteristic of LAEs at \\(z \\sim 6\\), its detection suggests that the universe is \\(\\gtrsim 5\\%\\) ionized by \\(z = 13\\). We also investigate the possibility that the extreme properties of JADES-GS-z13-1-LA are driven by an AGN. Using a simple analysis based on the fact that AGN are expected to produce more ionizing photons than SFGs, we estimate that the likelihood that JADES-GS-z13-1-LA hosts an AGN is \\(88\\%\\), \\(66\\%\\), and \\(33\\%\\) if the IGM is \\(< 1\\%\\), \\(\\approx 5\\%\\) and \\(\\approx 25\\%\\) ionized, respectively. We also highlight other features in the spectrum of JADES-GS-z13-1-LA that may be indicative of AGN activity, including strong Ly\\(\\alpha\\) damping wing absorption extending to \\(\\sim 1300\\) angstroms, and a possible CII*\\(\\lambda1335\\) emission line. Our findings strongly motivate dedicated follow-up observations of JADES-GS-z13-1-LA to determine whether it hosts an AGN.
Publisher
Cornell University Library, arXiv.org
Subject
