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

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.; Domínguez, A.; Dirirsa, F. Fana; 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.; Jóhannesson, 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.; Martí-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.; Rainò, S.; Rando, R.; Rani, B.; Razzano, M.; Razzaque, S.; Reimer, A.; Reimer, O.; Schinzel, F. K.; Serini, D.; Sgrò, 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.

doi:10.3847/1538-4357/ab791e

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

Journal Article · 02 April 2020 · The Astrophysical Journal (Online)

DOI: https://doi.org/10.3847/1538-4357/ab791e · OSTI ID:1616843

Ajello, M.; Angioni, R.;

;

; Barbiellini, G.;

;

; Bloom, E. D.; Bonino, R.; Bottacini, E.; Bruel, P.; Buson, S.;

; Cameron, R. A.; Cavazzuti, E.; Chen, S.;

; Ciprini, S. more »

We report 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 objects located at high Galactic latitudes (). 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, 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE; National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); Alfred P. Sloan Foundation

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1616843

Journal Information:: The Astrophysical Journal (Online), Journal Name: The Astrophysical Journal (Online) Journal Issue: 2 Vol. 892; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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RADIO-WEAK BL LAC OBJECTS IN THE FERMI ERA Massaro, F.; Marchesini, E. J.; D’Abrusco, R. The Astrophysical Journal, Vol. 834, Issue 2 https://doi.org/10.3847/1538-4357/834/2/113	journal	January 2017
THE CONTRIBUTION OF FERMI -2LAC BLAZARS TO DIFFUSE TEV–PEV NEUTRINO FLUX Aartsen, M. G.; Abraham, K.; Ackermann, M. The Astrophysical Journal, Vol. 835, Issue 1 https://doi.org/10.3847/1538-4357/835/1/45	journal	January 2017
On the Redshift of TeV BL Lac Objects Paiano, Simona; Landoni, Marco; Falomo, Renato The Astrophysical Journal, Vol. 837, Issue 2 https://doi.org/10.3847/1538-4357/837/2/144	journal	March 2017
Radio Follow-up on All Unassociated Gamma-Ray Sources from the Third Fermi Large Area Telescope Source Catalog Schinzel, Frank K.; Petrov, Leonid; Taylor, Gregory B. The Astrophysical Journal, Vol. 838, Issue 2 https://doi.org/10.3847/1538-4357/aa6439	journal	April 2017
Spectroscopy of 10 γ -Ray BL Lac Objects at High Redshift Paiano, Simona; Landoni, Marco; Falomo, Renato The Astrophysical Journal, Vol. 844, Issue 2 https://doi.org/10.3847/1538-4357/aa7aac	journal	July 2017
The Second Catalog of Flaring Gamma-Ray Sources from the Fermi All-sky Variability Analysis Abdollahi, S.; Ackermann, M.; Ajello, M. The Astrophysical Journal, Vol. 846, Issue 1 https://doi.org/10.3847/1538-4357/aa8092	journal	August 2017
Constraints on Physical Conditions for the Acceleration on Ultra-high-energy Cosmic Rays in Nearby Active Galactic Nuclei (AGNs) Observed with the Fermi Large Area Telescope Kagaya, Mika; Katagiri, Hideaki; Yoshida, Tatsuo The Astrophysical Journal, Vol. 850, Issue 1 https://doi.org/10.3847/1538-4357/aa9226	journal	November 2017
General Physical Properties of CGRaBS Blazars Paliya, Vaidehi S.; Marcotulli, L.; Ajello, M. The Astrophysical Journal, Vol. 851, Issue 1 https://doi.org/10.3847/1538-4357/aa98e1	journal	December 2017
Optical Spectroscopic Survey of a Sample of Unidentified Fermi Objects Paiano, Simona; Falomo, Renato; Franceschini, Alberto The Astrophysical Journal, Vol. 851, Issue 2 https://doi.org/10.3847/1538-4357/aa9af4	journal	December 2017
Deriving the Contribution of Blazars to the Fermi -LAT Extragalactic γ -ray Background at E > 10 GeV with Efficiency Corrections and Photon Statistics Di Mauro, M.; Manconi, S.; Zechlin, H. -S. The Astrophysical Journal, Vol. 856, Issue 2 https://doi.org/10.3847/1538-4357/aab3e5	journal	March 2018
High-redshift BL Lac Objects: Spectroscopy of Candidates Landoni, M.; Paiano, S.; Falomo, R. The Astrophysical Journal, Vol. 861, Issue 2 https://doi.org/10.3847/1538-4357/aac77c	journal	July 2018
Missing Gamma-Ray Halos and the Need for New Physics in the Gamma-Ray Sky Broderick, Avery E.; Tiede, Paul; Chang, Philip The Astrophysical Journal, Vol. 868, Issue 2 https://doi.org/10.3847/1538-4357/aae5f2	journal	November 2018
The Radio/Gamma Connection of Blazars from High to Low Radio Frequencies Fan, Xu-Liang; Wu, Qingwen The Astrophysical Journal, Vol. 869, Issue 2 https://doi.org/10.3847/1538-4357/aaeece	journal	December 2018
Optical Spectroscopic Survey of a Sample of Unidentified Fermi Objects: II Paiano, Simona; Falomo, Renato; Treves, Aldo The Astrophysical Journal, Vol. 871, Issue 2 https://doi.org/10.3847/1538-4357/aaf6e4	journal	January 2019
MOJAVE. XVII. Jet Kinematics and Parent Population Properties of Relativistically Beamed Radio-loud Blazars Lister, M. L.; Homan, D. C.; Hovatta, T. The Astrophysical Journal, Vol. 874, Issue 1 https://doi.org/10.3847/1538-4357/ab08ee	journal	March 2019
Investigation of Two Fermi -LAT Gamma-Ray Blazars Coincident with High-energy Neutrinos Detected by IceCube Garrappa, S.; Buson, S.; Franckowiak, A. The Astrophysical Journal, Vol. 880, Issue 2 https://doi.org/10.3847/1538-4357/ab2ada	journal	July 2019
A Catalog of Narrow Line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Data Release 12 Rakshit, Suvendu; Stalin, C. S.; Chand, Hum The Astrophysical Journal Supplement Series, Vol. 229, Issue 2 https://doi.org/10.3847/1538-4365/aa6971	journal	April 2017
The Search for Spatial Extension in High-latitude Sources Detected by the Fermi Large Area Telescope Ackermann, M.; Ajello, M.; Baldini, L. The Astrophysical Journal Supplement Series, Vol. 237, Issue 2 https://doi.org/10.3847/1538-4365/aacdf7	journal	August 2018
An Updated Catalog of Giant Radio Sources Kuźmicz, Agnieszka; Jamrozy, Marek; Bronarska, Katarzyna The Astrophysical Journal Supplement Series, Vol. 238, Issue 1 https://doi.org/10.3847/1538-4365/aad9ff	journal	September 2018
Fermi Large Area Telescope Fourth Source Catalog Abdollahi, S.; Acero, F.; Ackermann, M. The Astrophysical Journal Supplement Series, Vol. 247, Issue 1 https://doi.org/10.3847/1538-4365/ab6bcb	journal	March 2020
FIRST DETECTION IN GAMMA-RAYS OF A YOUNG RADIO GALAXY: FERMI -LAT OBSERVATIONS OF THE COMPACT SYMMETRIC OBJECT PKS 1718−649 Migliori, G.; Siemiginowska, A.; Sobolewska, M. The Astrophysical Journal, Vol. 821, Issue 2 https://doi.org/10.3847/2041-8205/821/2/L31	journal	April 2016
Gamma-Ray Blazars within the First 2 Billion Years Ackermann, M.; Ajello, M.; Baldini, L. The Astrophysical Journal, Vol. 837, Issue 1 https://doi.org/10.3847/2041-8213/aa5fff	journal	February 2017
Gamma-Ray-emitting Narrow-line Seyfert 1 Galaxies in the Sloan Digital Sky Survey Paliya, Vaidehi S.; Ajello, M.; Rakshit, S. The Astrophysical Journal, Vol. 853, Issue 1 https://doi.org/10.3847/2041-8213/aaa5ab	journal	January 2018

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Contribution of Secondary Neutrinos from Line-of-sight Cosmic-Ray Interactions to the IceCube Diffuse Astrophysical Flux Kochocki, Alina; Takhistov, Volodymyr; Kusenko, Alexander The Astrophysical Journal, Vol. 914, Issue 2 https://doi.org/10.3847/1538-4357/abf830	journal	June 2021

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