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.

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

Bonino R.;Buson S.;Maldera S.;Massaro F.;Migliori G.;
2020

Abstract

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.
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https://iopscience.iop.org/article/10.3847/1538-4357/ab791e/pdf
https://arxiv.org/abs/1905.10771
Active galactic nuclei; Blazars; Gamma-ray sources; Relativistic jets; Quasars; BL Lacertae objects
Ajello M.; Angioni R.; Axelsson M.; Ballet J.; Barbiellini G.; Bastieri D.; Becerra Gonzalez J.; Bellazzini R.; Bissaldi E.; Bloom E.D.; Bonino R.; Bottacini E.; Bruel P.; Buson S.; Cafardo F.; Cameron R.A.; Cavazzuti E.; Chen S.; Cheung C.C.; Ciprini S.; Costantin D.; Cutini S.; D'Ammando F.; De La Torre Luque P.; De Menezes R.; De Palma F.; Desai A.; Di Lalla N.; Di Venere L.; Dominguez A.; Dirirsa F.F.; Ferrara E.C.; Finke J.; Franckowiak A.; Fukazawa Y.; Funk S.; Fusco P.; Gargano F.; Garrappa S.; Gasparrini D.; Giglietto N.; Giordano F.; Giroletti M.; Green D.; Grenier I.A.; Guiriec S.; Harita S.; Hays E.; Horan D.; Itoh R.; Johannesson G.; Kovac'Evic' M.; Krauss F.; Kreter M.; Kuss M.; Larsson S.; Leto C.; Li J.; Liodakis I.; Longo F.; Loparco F.; Lott B.; Lovellette M.N.; Lubrano P.; Madejski G.M.; Maldera S.; Manfreda A.; Marti-Devesa G.; Massaro F.; Mazziotta M.N.; Mereu I.; Meyer M.; Migliori G.; Mirabal N.; Mizuno T.; Monzani M.E.; Morselli A.; Moskalenko I.V.; Negro M.; Nemmen R.; Nuss E.; Ojha L.S.; Ojha R.; Omodei N.; Orienti M.; Orlando E.; Ormes J.F.; Paliya V.S.; Pei Z.; Peña-Herazo H.; Persic M.; Pesce-Rollins M.; Petrov L.; Piron F.; Poon H.; Principe G.; Raino S.; Rando R.; Rani B.; Razzano M.; Razzaque S.; Reimer A.; Reimer O.; Schinzel F.K.; Serini D.; Sgro C.; Siskind E.J.; Spandre G.; Spinelli P.; Suson D.J.; Tachibana Y.; Thompson D.J.; Torres D.F.; Torresi E.; Troja E.; Valverde J.; Van Zyl P.; Yassine M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1755165
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