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The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope

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arxiv 1905.10771 v3 pith:JAQ5J5E3 submitted 2019-05-26 astro-ph.HE

The Fermi-LAT collaboration This is my paper · ORCID
classification astro-ph.HE
keywords agnscataloggalactictelescopeareadetectedfourthgamma-ray
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The fourth catalog of active galactic nuclei (AGNs) detected by the Fermi Gamma-ray Space Telescope Large Area Telescope (4LAC) between 2008 August 4 and 2016 August 2 contains 2863 objects located at high Galactic latitudes (|b|>10{\deg}). It includes 85% more sources than the previous 3LAC catalog based on 4 years of data. AGNs represent at least 79% of the high-latitude sources in the fourth Fermi-Large Area Telescope Source Catalog (4FGL), which covers the energy range from 50 MeV to 1 TeV. In addition, 344 gamma-ray AGNs are found at low Galactic latitudes. Most of the 4LAC AGNs are blazars (98%), while the remainder are other types of AGNs. The blazar population consists of 24% Flat Spectrum Radio Quasars (FSRQs), 38% BL Lac-type objects (BL Lacs), and 38% blazar candidates of unknown types (BCUs). On average, FSRQs display softer spectra and stronger variability in the gamma-ray band than BL Lacs do, confirming previous findings. All AGNs detected by ground-based atmospheric Cherenkov telescopes are also found in the 4LAC.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Radio-Gamma-Ray Properties and High-Energy Implications for Fermi Blazars

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    Using 1,687 Fermi blazars, the paper reports a plateau in gamma-ray loudness at high synchrotron peak frequencies, interpreted as Klein-Nishina suppression yielding magnetic field constraints for HBLs.

  2. Fermi-Large Area Telescope Detection of Very High Energy (>100 GeV) Emission from Compton-Dominated Blazars

    astro-ph.HE 2026-07 accept novelty 6.0 of 10

    Systematic Fermi-LAT search detects VHE emission from 14 Compton-dominated blazars (4 new at >5σ) and constrains the emitting region to >1.1–1.4 BLR radii.

  3. Peculiar Behavior of Optical Polarization in Blazar 1ES 1959+650: Role of Jet Magnetic Field and Geometry

    astro-ph.HE 2026-07 conditional novelty 5.0 of 10

    In 1ES 1959+650, optical polarization correlates positively with brightness before a flare, anti-correlates after it, and decouples during the flare — attributed to changing jet viewing geometry.

  4. Deciphering the Multi-Wavelength Flares of the Most Distant Very High-Energy (>100 GeV) Gamma-ray Emitting Blazar

    astro-ph.HE 2025-02 conditional novelty 5.0 of 10

    A one-zone leptonic model with torus-dominated external Compton radiation reproduces the multi-wavelength spectra of OP 313 in five states, placing the gamma-ray emission between the BLR and the dusty torus.

  5. Active Galactic Nuclei as high-energy neutrino sources

    astro-ph.HE 2026-06 unverdicted novelty 2.5 of 10

    Review summarizing correlations between astrophysical neutrinos and gamma-ray/radio AGN, specific source associations, proposed production mechanisms, and future prospects.

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