MULTIWAVELENGTH EVIDENCE FOR QUASI-PERIODIC MODULATION IN THE GAMMA-RAY BLAZAR PG 1553+113
M. AckermannDeutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, GermanyM. AjelloDepartment of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634-0978, USAA. AlbertW. 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. 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, USAL. BaldiniUniversità di Pisa and Istituto Nazionale di Fisica Nucleare, Sezione di Pisa I-56127 Pisa, ItalyJ. BalletLaboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d’Astrophysique, CEA Saclay, F-91191 Gif sur Yvette, FranceG. BarbielliniDipartimento di Fisica, Università di Trieste, I-34127 Trieste, ItalyD. BastieriDipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, ItalyJ. Becerra GonzálezDepartment of Physics and Department of Astronomy, University of Maryland, College Park, MD 20742, USAR. BellazziniIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyC. MeeganIstituto Nazionale di Fisica Nucleare, Sezione di Bari, I-70126 Bari, ItalyR. 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, USAR. BoninoDipartimento di Fisica Generale “Amadeo Avogadro,” Università degli Studi di Torino, I-10125 Torino, ItalyE. 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, USAJ. BregeonLaboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, Montpellier, FranceP. BruelLaboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, FranceR. BuehlerDeutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, GermanyS. BusonDipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, ItalyG. A. CaliandroConsorzio Interuniversitario per la Fisica Spaziale (CIFS), I-10133 Torino, ItalyR. 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, USAR. CaputoSanta 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. CaragiuloIstituto Nazionale di Fisica Nucleare, Sezione di Bari, I-70126 Bari, ItalyP. A. CaraveoINAF—Istituto di Astrofisica Spaziale e Fisica Cosmica, I-20133 Milano, ItalyE. CavazzutiAgenzia Spaziale Italiana (ASI) Science Data Center, I-00133 Roma, Italy; [email protected], [email protected]C. CecchiDipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, ItalyA. ChekhtmanCollege of Science, George Mason University, Fairfax, VA 22030, resident at Naval Research Laboratory, Washington, DC 20375, 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, USAG. ChiaroDipartimento di Fisica e Astronomia “G. Galilei,” Università di Padova, I-35131 Padova, ItalyS. CipriniAgenzia Spaziale Italiana (ASI) Science Data Center, I-00133 Roma, Italy; [email protected], [email protected]J. Cohen-TanugiLaboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, Montpellier, FranceJ. ConradDepartment of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm, SwedenS. CutiniAgenzia Spaziale Italiana (ASI) Science Data Center, I-00133 Roma, Italy; [email protected], [email protected]F. D’AmmandoDipartimento di Astronomia, Università di Bologna, I-40127 Bologna, 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 PalmaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, I-70126 Bari, ItalyR. DesianteIstituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino, ItalyL. Di VenereDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyA. Domi´nguezDepartment of Physics and Astronomy, Clemson University, Kinard Lab of Physics, Clemson, SC 29634-0978, USAP. S. DrellW. 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. 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, USA; [email protected]W. B. FockeW. 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. FuhrmannMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanyY. FukazawaDepartment of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanP. FuscoDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyF. GarganoIstituto Nazionale di Fisica Nucleare, Sezione di Bari, I-70126 Bari, ItalyD. GasparriniAgenzia Spaziale Italiana (ASI) Science Data Center, I-00133 Roma, Italy; [email protected], [email protected]N. GigliettoDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyP. GiommiAgenzia Spaziale Italiana (ASI) Science Data Center, I-00133 Roma, Italy; [email protected], [email protected]F. GiordanoDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyM. GirolettiINAF Istituto di Radioastronomia, I-40129 Bologna, ItalyG. GodfreyW. 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, USAD. GreenDepartment of Physics and Department of Astronomy, University of Maryland, College Park, MD 20742, USAI. A. GrenierLaboratoire AIM, CEA-IRFU/CNRS/Université Paris Diderot, Service d’Astrophysique, CEA Saclay, F-91191 Gif sur Yvette, FranceJ. E. GroveCEA Paris-SaclayS. GuiriecNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; [email protected]A. K. HardingNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; [email protected]E. HaysNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; [email protected]J. W. HewittUniversity of North Florida, Department of Physics, 1 UNF Drive, Jacksonville, FL 32224, USAA. B. HillSchool of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, UKD. HoranLaboratoire Leprince-Ringuet, École polytechnique, CNRS/IN2P3, Palaiseau, FranceT. JoglerW. 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, USAG. 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, USAT. KamaeDepartment of Physics, Graduate School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, JapanM. KussIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyS. LarssonDepartment of Physics, KTH Royal Institute of Technology, AlbaNova, SE-106 91 Stockholm, SwedenL. LatronicoIstituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino, ItalyJ. LiInstitute of Space Sciences (IEEC-CSIC), Campus UAB, E-08193 Barcelona, SpainF. LongoDipartimento di Fisica, Università di Trieste, I-34127 Trieste, ItalyF. LoparcoDipartimento di Fisica “M. Merlin” dell’Università e del Politecnico di Bari, I-70126 Bari, ItalyB. LottCentre d’Études Nucléaires de Bordeaux Gradignan, IN2P3/CNRS, Université Bordeaux 1, BP120, F-33175 Gradignan Cedex, FranceM. N. LovelletteSpace Science Division, Naval Research Laboratory, Washington, DC 20375-5352, USAP. LubranoDipartimento di Fisica, Università degli Studi di Perugia, I-06123 Perugia, ItalyJ. MagillDepartment of Physics and Department of Astronomy, University of Maryland, College Park, MD 20742, USAS. MalderaIstituto Nazionale di Fisica Nucleare, Sezione di Torino, I-10125 Torino, ItalyAlberto ManfredaIstituto Nazionale di Fisica Nucleare, Sezione di Pisa, I-56127 Pisa, ItalyW. Max-MoerbeckCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAM. MayerDeutsches Elektronen Synchrotron DESY, D-15738 Zeuthen, GermanyM. N. MazziottaIstituto Nazionale di Fisica Nucleare, Sezione di Bari, I-70126 Bari, ItalyJ. E. MceneryDepartment of Physics and Department of Astronomy, University of Maryland, College Park, MD 20742, USAP. F. MichelsonAalto UniversityT. MizunoHiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanM. E. MonzaniW. 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. MorselliIstituto Nazionale di Fisica Nucleare, Sezione di Roma “Tor Vergata,” I-00133 Roma, ItalyI. V. MoskalenkoW. 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. MurgiaCenter for Cosmology, Physics and Astronomy Department, University of California, Irvine, CA 92697-2575, USAE. NussLaboratoire Univers et Particules de Montpellier, Université Montpellier, CNRS/IN2P3, Montpellier, FranceM. OhnoDepartment of Physical Sciences, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanT. OhsugiHiroshima Astrophysical Science Center, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8526, JapanR. OjhaNASA Goddard Space Flight Center, Greenbelt, MD 20771, USA; [email protected]N. OmodeiW. 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. OrlandoW. 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, USAJ. F. OrmesDepartment of Physics and Astronomy, University of Denver, Denver, CO 80208, USAD. PanequeMax-Planck-Institut für Physik, D-80805 München, GermanyT. J. PearsonCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAJ. S. PerkinsINAF, Osservatorio Astronomico di Torino, I-10025 Pino Torinese (TO), Italy
2015en
ABI
Аннотация
We report for the first time a -ray and multiwavelength nearly periodic oscillation in an active galactic nucleus. Using the Fermi Large Area Telescope we have discovered an apparent quasi-periodicity in the -ray flux (E > 100 MeV) from the GeV/TeV BL Lac object PG 1553+113. The marginal significance of the 2.18 0.08 year period -ray cycle is strengthened by correlated oscillations observed in radio and optical fluxes, through data collected in the Owens Valley Radio Observatory, Tuorla, Katzman Automatic Imaging Telescope, and Catalina Sky Survey monitoring programs and Swift-UVOT. The optical cycle appearing in 10 years of data has a similar period, while the 15 GHz oscillation is less regular than seen in the other bands. Further long-term multiwavelength monitoring of this blazar may discriminate among the possible explanations for this quasi-periodicity.
Перевод пока недоступен
Идентификаторы
Цитирования и источники
Цитирований: 4Использованных источников: 0