Science

A new view of the gamma-ray gap: 14 years of Fermi data reveal around 450 sources in a largely unexplored energy range

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Briefings

A new analysis of Fermi-LAT data from 2026 indicates approximately 450 gamma-ray sources exist in an energy range previously unexplored, challenging previous assumptions about the gamma-ray gap. This finding emerged from a study published in November 2026, utilizing the Fermi-Large Area Telescope launched by NASA in 2008 to detect photons between 20 MeV and 1 TeV.

Key points

• The Fermi-Large Area Telescope, launched by NASA in 2008, detects photons from 20 MeV to 1 TeV.
• A 2026 analysis identified approximately 450 gamma-ray sources in an energy range previously considered unexplored.

Context

Gamma rays are produced in extreme environments like black holes and exploding stars. The Fermi-LAT instrument allows astrophysicists to observe these high-energy photons, revealing the distribution of cosmic sources across different energy levels.

Limitations

The evidence is limited to a single study published in November 2026. The analysis relies on Fermi-LAT data collected over a specific period, and the 450 source count is a snapshot of the data available at that time. Uncertainty exists regarding the long-term stability of the identified sources and the completeness of the energy range coverage.

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