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Título: | The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope |
Autor: | Ajello, Marco; Torres, Diego F. ; Yassine, Manal; Fermi-LAT Collaboration | Palabras clave: | Gamma rays: galaxies Gamma rays: observations Galaxies: active Galaxies: jets BL Lacertae objetcs: general Quasars: general |
Fecha de publicación: | 1-abr-2020 | Editor: | IOP Publishing | Citación: | Astrophysical Journal 892(2): 105 (2020) | Resumen: | 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°). It includes 85% more sources than the previous 3LAC catalog based on 4 yr 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, and 38% blazar candidates of unknown types (BCUs). On average, FSRQs display softer spectra and stronger variability in the gamma-ray band than BLQLacs do, confirming previous findings. All AGNs detected by ground-based atmospheric Cerenkov telescopes are also found in the 4LAC. | Versión del editor: | http://doi.org/10.3847/1538-4357/ab791e | URI: | http://hdl.handle.net/10261/235580 | DOI: | 10.3847/1538-4357/ab791e | Identificadores: | doi: 10.3847/1538-4357/ab791e issn: 1538-4357 |
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Fourth_catalog_of_active_calactic_nuclei.pdf | 1,17 MB | Adobe PDF | Visualizar/Abrir |
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