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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°). 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

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.

2020-01-01

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.

Scheda breve

Scheda completa

Scheda completa (DC)

	Anno
	
			2020
		
	Titolo rivista
	
			THE ASTROPHYSICAL JOURNAL
		
	N. Volume
	
			892
		
	Fascicolo
	
			2
		
	Pagine (da)
	
			105
		
	Pagine (a)
	
			127
		
	DOI
	
			https://dx.doi.org/10.3847/1538-4357/ab791e
		
	URL del prodotto (archivi open access, fulltext su sito editore, etc.)
	
			https://iopscience.iop.org/article/10.3847/1538-4357/ab791e/pdf
https://arxiv.org/abs/1905.10771
		
	Parole Chiave
	
			Active galactic nuclei; Blazars; Gamma-ray sources; Relativistic jets; Quasars; BL Lacertae objects
		
	Tutti gli autori
	
			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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			03A-Articolo su Rivista

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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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