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One Small Galaxy May Have Cleared Its Own Cosmic Bubble
JWST found the third confirmed Lyman-alpha emitter beyond redshift nine, without a surrounding galaxy overdensity to explain it.
Summary
JWST found the third confirmed Lyman-alpha emitter beyond redshift nine, without a surrounding galaxy overdensity to explain it.
More than ten hours of NIRSpec observations place C3PO-8447 at redshift 8.99781 and detect Lyman-alpha emission escaping at 1.5 ± 0.3%. The galaxy is young, low-mass and metal-poor, with ultraviolet diagnostics pointing to a recent starburst rather than an active nucleus. The inferred ionized bubble spans roughly 0.07 to 0.20 physical megaparsecs, a size the authors say the galaxy can produce alone. They find no large-scale overdensity or major neighboring contribution, making the object a compact view of early reionization rather than proof that isolated galaxies dominated the era.
Why it matters
JWST found the third confirmed Lyman-alpha emitter beyond redshift nine, without a surrounding galaxy overdensity to explain it.
Limits and context
No additional limitation was separately recorded.
Key claims
JWST found the third confirmed Lyman-alpha emitter beyond redshift nine, without a surrounding galaxy overdensity to explain it.
Evidence: source-2026-09-05-012
Sources
- arXiv preprint 2609.03608arXiv · primary research
Corrections
No corrections have been recorded for this story.