Maqola

THE SECOND CATALOG OF ACTIVE GALACTIC NUCLEI DETECTED BY THE<i>FERMI</i>LARGE AREA TELESCOPE

M. AckermannKavli Institute for Particle Astrophysics and CosmologyM. AjelloW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAA. AllafortKavli Institute for Particle Astrophysics and CosmologyE. AntoliniIstituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, ItalyW. B. AtwoodSanta Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USAM. AxelssonDepartment of Physics, Royal Institute of Technology (KTH), AlbaNova, SE-106 91 Stockholm, SwedenL. BaldiniIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyJ. BalletUniversité Paris CitéG. BarbielliniIstituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, ItalyD. BastieriIstituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, ItalyK. BechtolW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAR. BellazziniIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyB. BerenjiW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAR. D. BlandfordW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAE. D. BloomW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAE. BonamenteDipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, ItalyA. W. BorglandKavli Institute for Particle Astrophysics and CosmologyE. BottaciniW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAA. BouvierSanta Cruz Institute for Particle Physics, Department of Physics and Department of Astronomy and Astrophysics, University of California at Santa Cruz, Santa Cruz, CA 95064, USAJ. BregeonIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyM. BrigidaDipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, ItalyP. BruelLaboratoire Leprince-RinguetR. BuehlerStanford UniversityT. H. BurnettDepartment of Physics, University of Washington, Seattle, WA 98195-1560, USAS. BusonIstituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, ItalyG. A. CaliandroInstitut de Ciències de l'Espai (IEEE-CSIC), Campus UAB, 08193 Barcelona, SpainR. A. CameronW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAP. A. CaraveoINAF-Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano, ItalyJ. M. CasandjianUniversité Paris CitéE. CavazzutiAgenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), ItalyC. CecchiDipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, ItalyE. CharlesW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAC. C. CheungNational Research Council Research Associate, National Academy of Sciences, Washington, DC 20001, USAJ. ChiangW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAS. CipriniDipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, ItalyR. ClausKavli Institute for Particle Astrophysics and CosmologyJ. Cohen-TanugiUniversité de MontpellierJ. M. ConradDepartment of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, SwedenL. CostamanteStanford UniversityS. CutiniAgenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), ItalyA. De AngelisDipartimento di Fisica, Università di Udine and Istituto Nazionale di Fisica Nucleare, Sezione di Trieste, Gruppo Collegato di Udine, I-33100 Udine, ItalyF. de PalmaDipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, ItalyC. D. DermerSpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USAS. W. DigelKavli Institute for Particle Astrophysics and CosmologyE. do Couto e SilvaStanford UniversityP. S. DrellKavli Institute for Particle Astrophysics and CosmologyR. DuboisW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAL. EscandeLaboratoire de Physique des deux infinis BordeauxC. FavuzziDipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, ItalyS. FeganLaboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, FranceE. C. FerraraNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAJ. FinkeSpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USAW. B. FockeKavli Institute for Particle Astrophysics and CosmologyP. FortinLaboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, FranceM. FrailisNational Institute for AstrophysicsY. FukazawaDepartment of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanS. FunkKavli Institute for Particle Astrophysics and CosmologyP. FuscoDipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, ItalyF. GarganoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyD. GasparriniAgenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), ItalyN. GehrelsNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAS. GermaniIstituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, ItalyB. GiebelsÉcole PolytechniqueN. GigliettoDipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, ItalyP. GiommiAgenzia Spaziale Italiana (ASI) Science Data Center, I-00044 Frascati (Roma), ItalyF. GiordanoDipartimento di Fisica "M. Merlin" dell'Università e del Politecnico di Bari, I-70126 Bari, ItalyM. GirolettiINAF Istituto di Radioastronomia, 40129 Bologna, ItalyT. GlanzmanStanford UniversityG. GodfreyStanford UniversityI. A. GrenierUniversité Paris CitéJ. E. GroveSpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USAS. GuiriecCenter for Space Plasma and Aeronomic Research (CSPAR), University of Alabama in Huntsville, Huntsville, AL 35899, USAM. GustafssonIstituto Nazionale di Fisica Nucleare, Sezione di Padova, I-35131 Padova, ItalyD. HadaschInstitut de Ciències de l'Espai (IEEE-CSIC), Campus UAB, 08193 Barcelona, SpainM. HayashidaW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAE. HaysNASA Goddard Space Flight Center, Greenbelt, MD 20771, USAS. E. HealeyStanford UniversityD. HoranLaboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, FranceX. T. HouInstitut National de Physique Nucléaire et de Physique des ParticulesR. E. HughesDepartment of Physics, Center for Cosmology and Astro-Particle Physics, The Ohio State University, Columbus, OH 43210, USAG. IafrateIstituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, ItalyG. JóhannessonScience Institute, University of Iceland, IS-107 Reykjavik, IcelandA. S. JohnsonW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAW. N. JohnsonSpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USAT. KamaeW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAH. KatagiriCollege of Science, Ibaraki University, 2-1-1, Bunkyo, Mito 310-8512, JapanJ. KataokaResearch Institute for Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku, Tokyo 169-8555, JapanJ. KnödlsederCNRS, IRAP, F-31028 Toulouse cedex 4, FranceM. KussIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyJ. LandéKavli Institute for Particle Astrophysics and CosmologyS. LarssonThe Oskar Klein Centre for Cosmoparticle Physics, AlbaNova, SE-106 91 Stockholm, SwedenL. LatronicoIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyF. LongoIstituto Nazionale di Fisica Nucleare, Sezione di Trieste, I-34127 Trieste, ItalyF. LoparcoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyB. LottUniversité Bordeaux 1, CNRS/IN2p3, Centre d'Études Nucléaires de Bordeaux Gradignan, 33175 Gradignan, FranceM. N. LovelletteSpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USAP. LubranoIstituto Nazionale di Fisica Nucleare, Sezione di Perugia, I-06123 Perugia, ItalyG. M. MadejskiW. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USAM. N. MazziottaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, 70126 Bari, ItalyW. McConvilleNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

2011en

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Annotatsiya

The second catalog of active galactic nuclei (AGNs) detected by the Fermi Large Area Telescope (LAT) in two years of scientific operation is presented. The second LAT AGN catalog (2LAC) includes 1017 γ-ray sources located at high Galactic latitudes (|b| > 10°) that are detected with a test statistic (TS) greater than 25 and associated statistically with AGNs. However, some of these are affected by analysis issues and some are associated with multiple AGNs. Consequently, we define a Clean Sample which includes 886 AGNs, comprising 395 BL Lacertae objects (BL Lac objects), 310 flat-spectrum radio quasars (FSRQs), 157 candidate blazars of unknown type (i.e., with broadband blazar characteristics but with no optical spectral measurement yet), 8 misaligned AGNs, 4 narrow-line Seyfert 1 (NLS1s), 10 AGNs of other types, and 2 starburst galaxies. Where possible, the blazars have been further classified based on their spectral energy distributions (SEDs) as archival radio, optical, and X-ray data permit. While almost all FSRQs have a synchrotron-peak frequency <1014 Hz, about half of the BL Lac objects have a synchrotron-peak frequency >1015 Hz. The 2LAC represents a significant improvement relative to the first LAT AGN catalog (1LAC), with 52% more associated sources. The full characterization of the newly detected sources will require more broadband data. Various properties, such as γ-ray fluxes and photon power-law spectral indices, redshifts, γ-ray luminosities, variability, and archival radio luminosities and their correlations are presented and discussed for the different blazar classes. The general trends observed in 1LAC are confirmed.

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DOI: 10.1088/0004-637x/743/2/171

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