ACKERMANN, M.; AJELLO, M.; ALBERT, A.; ATWOOD, W.B.; BALDINI, L.; BALLET, J.; BARBIELLINI, G.; BASTIERI, D.; BECERRA GONZALEZ, J.; BELLAZZINI, R.; BISSALDI, E.; BLANDFORD, R.D.; BLOOM, E.D.; BONINO, R.; BOTTACINI, E.; BREGEON, J.; BRUEL, P.; BUEHLER, R.; BUSON, S.; CALIANDRO, G.A.; CAMERON, R.A.; CAPUTO, R.; CARAGIULO, M.; CARAVEO, P.A.; CAVAZZUTI, E.; CECCHI, C.; CHEKHTMAN, A.; CHIANG, J.; CHIARO, G.; CIPRINI, S.; COHEN-TANUGI, Johann; CONRAD, J.; CUTINI, S.; D'AMMANDO, F.; DE ANGELIS, A.; DE PALMA, F.; DESIANTE, R.; DI VENERE, L.; DOMÍNGUEZ, A.; DRELL, P.S.; FAVUZZI, C.; FEGAN, S.J.; FERRARA, E.C.; FOCKE, W.B.; FUHRMANN, L.; FUKAZAWA, Y.; FUSCO, P.; GARGANO, F.; GASPARRINI, D.; GIGLIETTO, N.; GIOMMI, P.; GIORDANO, F.; GIROLETTI, M.; GODFREY, G.; GREEN, D.; GRENIER, I.A.; GROVE, J.E.; GUIRIEC, S.; HARDING, A.K.; HAYS, E.; HEWITT, J.W.; HILL, A.B.; HORAN, D.; JOGLER, T.; JÓHANNESSON, G.; JOHNSON, A.S.; KAMAE, T.; KUSS, M.; LARSSON, S.; LATRONICO, L.; LI, J.; LI, L.; LONGO, F.; LOPARCO, F.; LOTT, B.; LOVELLETTE, M.N.; LUBRANO, P.; MAGILL, J.; MALDERA, S.; MANFREDA, A.; MAX-MOERBECK, W.; MAYER, M.; MAZZIOTTA, M.N.; MCENERY, J.E.; MICHELSON, P.F.; MIZUNO, T.; MONZANI, M.E.; MORSELLI, A.; MOSKALENKO, I.V.; MURGIA, S.; NUSS, E.; OHNO, M.; OHSUGI, T.; OJHA, R.; OMODEI, N.; ORLANDO, E.; ORMES, J.F.; PANEQUE, D.; PEARSON, T.J.; PERKINS, J.S.; PERRI, M.; PESCE-ROLLINS, M.; PETROSIAN, V.; PIRON, F.; PIVATO, G.; PORTER, T.A.; RAINÒ, S.; RANDO, R.; RAZZANO, M.; READHEAD, A.; REIMER, A.; REIMER, O.; SCHULZ, A.; SGRÒ, C.; SISKIND, E.J.; SPADA, F.; SPANDRE, G.; SPINELLI, P.; SUSON, D.J.; TAKAHASHI, H.; THAYER, J.B.; THOMPSON, D.J.; TIBALDO, L.; TORRES, D.F.; TOSTI, G.; TROJA, E.; UCHIYAMA, Y.; VIANELLO, G.; WOOD, K.S.; WOOD, M.; ZIMMER, S.; BERDYUGIN, A.; CORBET, R.H.D.; HOVATTA, T.; LINDFORS, E.; NILSSON, K.; REINTHAL, R.; SILLANPÄÄ, A.; STAMERRA, A.; TAKALO, L.O.; VALTONEN, M.J.

doi:10.1088/2041-8205/813/2/L41

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Astrophys.J.Lett.. 2015, vol. 813, n° 2, p. L41

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We report for the first time a γ-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 γ-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 γ-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.< Réduire

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accretion

accretion disks

BL Lacertae objects: general

BL Lacertae objects: individual

galaxies: jets

gamma rays: galaxies

gamma rays: general

gamma ray: flux

oscillation

monitoring

optical

blazar

modulation

AGN

GLAST

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Multiwavelength Evidence for Quasi-periodic Modulation in the Gamma-ray Blazar PG 1553+113

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