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Number of Authors: 141
2015 (English)In: Astrophysical Journal Letters, ISSN 2041-8205, E-ISSN 2041-8213, Vol. 813, no 2, L41Article in journal (Refereed) Published
Abstract [en]

We report for the first time a gamma-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 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 Owens Valley Radio Observatory, Tuorla, Katzman Automatic Imaging Telescope, and Catalina Sky Survey monitoring programs and Swift-UVOT. The optical cycle appearing in similar to 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.

Place, publisher, year, edition, pages
2015. Vol. 813, no 2, L41
Keyword [en]
accretion, accretion disks, BL Lacertae objects: general, BL Lacertae objects: individual (PG 1553+113), galaxies: jets, gamma rays: galaxies, gamma rays: general
National Category
Physical Sciences
URN: urn:nbn:se:su:diva-124765DOI: 10.1088/2041-8205/813/2/L41ISI: 000365035000019OAI: diva2:891373
Available from: 2016-01-07 Created: 2016-01-04 Last updated: 2016-01-07Bibliographically approved

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Conrad, JanLarsson, StefanZimmer, Stephan
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Department of PhysicsThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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ReferencesLink to record
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