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arxiv: 1509.02063 · v3 · submitted 2015-09-07 · 🌌 astro-ph.HE

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

The Fermi LAT Collaboration: M. Ackermann , M. Ajello , A. Albert , W. B. Atwood , L. Baldini , J. Ballet , G. Barbiellini , D. Bastieri
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J. Becerra Gonzalez R. Bellazzini E. Bissaldi R. D. Blandford E. D. Bloom R. Bonino E. Bottacini J. Bregeon P. Bruel R. Buehler S. Buson G. A. Caliandro R. A. Cameron R. Caputo M. Caragiulo P. A. Caraveo E. Cavazzuti C. Cecchi A. Chekhtman J. Chiang G. Chiaro S. Ciprini J. Cohen-Tanugi J. Conrad S. Cutini F. D'Ammando A. De Angelis F. de Palma R. Desiante L. Di Venere A. Dominguez P. S. Drell C. Favuzzi S. J. Fegan E. C. Ferrara W. B. Focke L. Fuhrmann Y. Fukazawa P. Fusco F. Gargano D. Gasparrini N. Giglietto P. Giommi F. Giordano M. Giroletti G. Godfrey D. Green I. A. Grenier J. E. Grove S. Guiriec A. K. Harding E. Hays J.W. Hewitt A. B. Hill D. Horan T. Jogler G. Johannesson A. S. Johnson T. Kamae M. Kuss S. Larsson L. Latronico J. Li L. Li F. Longo F. Loparco B. Lott M. N. Lovellette P. Lubrano J. Magill S. Maldera A. Manfreda W. Max-Moerbeck M. Mayer M. N. Mazziotta J. E. McEnery P. F. Michelson T. Mizuno M. E. Monzani A. Morselli I. V. Moskalenko S. Murgia E. Nuss M. Ohno T. Ohsugi R. Ojha N. Omodei E. Orlando J. F. Ormes D. Paneque T. J. Pearson J. S. Perkins M. Perri M. Pesce-Rollins V. Petrosian F. Piron G. Pivato T. A. Porter S. Raino' R. Rando M. Razzano A. Readhead A. Reimer O. Reimer A. Schulz C. Sgro' E. J. Siskind F. Spada G. Spandre P. Spinelli D. J. Suson H. Takahashi J. B. Thayer D. J. Thompson L. Tibaldo D. F. Torres G. Tosti E. Troja Y. Uchiyama G. Vianello K. S. Wood M. Wood S. Zimmer A. Berdyugin R. H. D. Corbet T. Hovatta E. Lindfors K. Nilsson R. Reinthal A. Sillanpaa A. Stamerra L. O. Takalo M. J. Valtonen
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classification 🌌 astro-ph.HE
keywords gamma-rayblazarcycledatamonitoringmulti-wavelengthopticaloscillation
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We report for the first time a gamma-ray and multi-wavelength nearly-periodic oscillation in an active galactic nucleus. Using the Fermi Large Area Telescope (LAT) we have discovered an apparent quasi-periodicity in the gamma-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 gamma-ray cycle is strengthened by correlated oscillations observed in radio and optical fluxes, through data collected in the OVRO, Tuorla, KAIT, and CSS 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 multi-wavelength monitoring of this blazar may discriminate among the possible explanations for this quasi-periodicity.

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  1. Tracking down the broadband polarimetric properties of PG 1553+113

    astro-ph.HE 2026-05 unverdicted novelty 4.0

    New IXPE X-ray polarimetry and optical monitoring of PG 1553+113 reveal variable polarization and a large EVPA swing, supporting jet models with related but non-co-spatial X-ray and optical emission regions.