The Astrophysical Journal Supplement Series· 2020Q1
Fermi Large Area Telescope Fourth Source Catalog
- 1,361citations
- Q1SCImago
- 2020year
Short summary
The fourth Fermi Large Area Telescope catalog (4FGL) is the deepest yet, detailing 5064 gamma-ray sources detected over eight years of observations (50 MeV to 1 TeV).
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Key points
- Presents the fourth Fermi Large Area Telescope catalog (4FGL) of γ-ray sources.
- Based on eight years of science data, covering 50 MeV to 1 TeV energy range.
- Includes 5064 sources above 4σ significance, with localization and spectral properties.
- Features analysis improvements, including an updated Galactic diffuse emission model.
- Identifies 358 sources based on extent, periodicity, or multi-wavelength variability.
AI-generated from the title and abstract; the full text is not read.
Abstract
Abstract We present the fourth Fermi Large Area Telescope catalog (4FGL) of γ -ray sources. Based on the first eight years of science data from the Fermi Gamma-ray Space Telescope mission in the energy range from 50 MeV to 1 TeV, it is the deepest yet in this energy range. Relative to the 3FGL catalog, the 4FGL catalog has twice as much exposure as well as a number of analysis improvements, including an updated model for the Galactic diffuse γ -ray emission, and two sets of light curves (one-year and two-month intervals). The 4FGL catalog includes 5064 sources above 4 σ significance, for which we provide localization and spectral properties. Seventy-five sources are modeled explicitly as spatially extended, and overall, 358 sources are considered as identified based on angular extent, periodicity, or correlated variability observed at other wavelengths. For 1336 sources, we have not found plausible counterparts at other wavelengths. More than 3130 of the identified or associated sources are active galaxies of the blazar class, and 239 are pulsars.
The authors' abstract, as published at the source. The Astrophysical Journal Supplement Series, 2020 · DOI ↗
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Field: Nuclear and High Energy Physics
Nuclear and High Energy PhysicsPhysics and Astronomy