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JWST discovers mysterious object with one single emission line in the Hubble Ultra Deep Field within the constellation of Fornax — where there doesn't seem to be anything at all

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Based on a feed excerpt; full article content has not been acquired. Source evidence retrieved 01/11/2026, 19:47:26 UTC.

Briefings

JWST detected a mysterious object in the Hubble Ultra Deep Field within Fornax, emitting a single strong emission line at 1.60 microns with a flux of 2.5x10^-18 erg s^-1 cm^-2. This signal appeared twice in nearly three months but was absent in all prior observations, suggesting a transient or extremely dim source. The object's emission line cannot be explained by known galaxies or quasars, and a lower limit on its frame equivalent width of 7620 Angstroms was established. The discovery remains unexplained and requires further investigation.

Key points

• JWST detected a single emission line at 1.60 microns with a flux of 2.5x10^-18 erg s^-1 cm^-2 in the Hubble Ultra Deep Field within Fornax.
• The emission line cannot be explained by known galaxies or quasars, and a lower limit on its frame equivalent width of 7620 Angstroms was established.

Context

The Hubble Ultra Deep Field is a deep field survey where most objects are too faint to detect. This finding represents a significant anomaly in a field where nothing was expected.

Limitations

The evidence is limited to a single detection from JWST and Hubble observations spanning nearly three months. The object's nature is unknown, and the emission line cannot be explained by known sources. The lower limit on frame equivalent width is a constraint rather than a definitive measurement.

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