Extreme Emission Line Galaxies in CEERS Are Powered by Star Formation, not AGN

We present a spectroscopic study of photometrically identified extreme emission-line galaxies (EELGs) with observed-frame equivalent widths (EWs) >5000 A of either H alpha or H beta + [OIII] in the CEERS legacy deep field utilizing JWST NIRSpec spectroscopy from the CAPERS, RUBIES, THRILS and CEERS surveys. This master sample allows for performance tests of photometric selections and unveils what types of sources, either AGN or young star formation, were producing excessive ionizing radiation in the early Universe. We identify AGN through broad H alpha emission-lines and report 6 new broad-line AGN at 3.5

Publication Details

Journal
Maryland Shared Open Access Repository (USMAI Consortium)
Published
2026-02-26
DOI
https://doi.org/10.13016/m2aikk-rmex
Primary Topic
Galaxies: Formation, Evolution, Phenomena
Type
article
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article

Extreme Emission Line Galaxies in CEERS Are Powered by Star Formation, not AGN

Maryland Shared Open Access Repository (USMAI Consortium)
Galaxies: Formation, Evolution, Phenomena
article

Extreme Emission Line Galaxies in CEERS Are Powered by Star Formation, not AGN

article en

Abstract

We present a spectroscopic study of photometrically identified extreme emission-line galaxies (EELGs) with observed-frame equivalent widths (EWs) >5000 A of either H alpha or H beta + [OIII] in the CEERS legacy deep field utilizing JWST NIRSpec spectroscopy from the CAPERS, RUBIES, THRILS and CEERS surveys. This master sample allows for performance tests of photometric selections and unveils what types of sources, either AGN or young star formation, were producing excessive ionizing radiation in the early Universe. We identify AGN through broad H alpha emission-lines and report 6 new broad-line AGN at 3.5

Maryland Shared Open Access Repository (USMAI Consortium)
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Galaxies: Formation, Evolution, Phenomena
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