3FHL: Fermi-LAT Catalog of High-Energy Gamma-Ray Sources

NASA's Fermi Large Area Telescope catalog of 1558 sources detected above 10 GeV, using data from its first 7 years. The catalog includes 225 new sources, with improved sensitivity and angular resolution over previous versions. It was ingested by the HEASARC in December 2017.

Use Cases

• Classifying gamma-ray source populations based on the 79% extragalactic and 9% Galactic composition.
• Analyzing spectral curvature for high-energy sources based on the 32 characterized objects.
• Studying flux variability in gamma-ray sources based on the 163 objects with measured variability.
• Comparing source density across energy thresholds based on the analysis of source counts above 10 GeV versus 50 GeV.

Strengths

• Contains 1558 characterized objects, a substantial increase from prior catalogs.
• Sensitivity and angular resolution improved by factors of 3 and 2 relative to the 1FHL catalog.
• Includes characterization of spectral curvature for 32 sources and flux variability for 163 sources.

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.

Provenance

Source

NASA Fermi Science Support Center (FSSC), processed by the HEASARC.

Collection Method

Data obtained from the Fermi-Large Area Telescope (LAT) using the Pass 8 event-level analysis.

Time Range

First 7 years of Fermi-LAT data.

Freshness

Last updated 2026-03-13 17:45:57.334575; freshness should be verified.

Geography

All-sky coverage, including high-latitude sky and Galactic plane.