The Fourth Catalog of Active Galactic Nuclei Detected by the Fermi Large Area Telescope
Journal
Date Issued
2020
Author(s)
Ajello, M.
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Angioni, R.
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Axelsson, M.
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Ballet, J.
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Barbiellini, G.
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Bastieri, D.
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Becerra Gonzalez, J.
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Bellazzini, R.
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Bissaldi, E.
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Bloom, E. D.
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Bonino, R.
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Bottacini, E.
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Bruel, P.
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Buson, S.
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Cafardo, F.
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Cameron, R. A.
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Cavazzuti, E.
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Chen, S.
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Cheung, C. C.
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Ciprini, S.
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Costantin, D.
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Cutini, S.
•
•
de la Torre Luque, P.
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de Menezes, R.
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de Palma, F.
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Desai, A.
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Di Lalla, N.
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Di Venere, L.
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Domínguez, A.
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Dirirsa, F. Fana
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Ferrara, E. C.
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Finke, J.
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Franckowiak, A.
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Fukazawa, Y.
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Funk, S.
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Fusco, P.
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Gargano, F.
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Garrappa, S.
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Gasparrini, D.
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Giglietto, N.
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Giordano, F.
•
•
Green, D.
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Grenier, I. A.
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Guiriec, S.
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Harita, S.
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Hays, E.
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Horan, D.
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Itoh, R.
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Jóhannesson, G.
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Kovac'evic', M.
•
Krauss, F.
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Kreter, M.
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Kuss, M.
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Larsson, S.
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Leto, C.
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Li, J.
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Liodakis, I.
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Longo, F.
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Loparco, F.
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Lott, B.
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Lovellette, M. N.
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Lubrano, P.
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Madejski, G. M.
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Maldera, S.
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Manfreda, A.
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Martí-Devesa, G.
•
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Mazziotta, M. N.
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Mereu, I.
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Meyer, M.
•
•
Mirabal, N.
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Mizuno, T.
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Monzani, M. E.
•
Morselli, A.
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Moskalenko, I. V.
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Negro, M.
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Nemmen, R.
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Nuss, E.
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Ojha, L. S.
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Ojha, R.
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Omodei, N.
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Orlando, E.
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Ormes, J. F.
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Paliya, V. S.
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Pei, Z.
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Peña-Herazo, H.
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Pesce-Rollins, M.
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Petrov, L.
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Piron, F.
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Poon, H.
•
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Rainò, S.
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Rando, R.
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Rani, B.
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Razzano, M.
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Razzaque, S.
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Reimer, A.
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Reimer, O.
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Schinzel, F. K.
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Serini, D.
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Sgrò, C.
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Siskind, E. J.
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Spandre, G.
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Spinelli, P.
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Suson, D. J.
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Tachibana, Y.
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Thompson, D. J.
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Torres, D. F.
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Troja, E.
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Valverde, J.
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van Zyl, P.
•
Yassine, M.
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 BL Lacs do, confirming previous findings. All AGNs detected by ground-based atmospheric Cerenkov telescopes are also found in the 4LAC.
Volume
892
Issue
2
Start page
105
Issn Identifier
0004-637X
Ads BibCode
2020ApJ...892..105A
Rights
open.access
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