Helical jets in blazars. Interpretation of the multifrequency long-term variability of AO 0235+16

Abstract

The long-term variability of the multiwavelength blazar emission can be interpreted in terms of orientation variations of a helical, inhomogeneous, non-thermally emitting jet, possibly caused by the orbital motion of the parent black hole in a binary system (Villata & Raiteri 1999). The helical-jet model is here applied to explain the quasi-periodic radio-optical light curves and the broad-band spectral energy distributions (SEDs) of the BL Lac object AO 0235+16. Through a suitable choice of the model parameters, the helix rotation can well account for the periodicity of the main radio and optical outbursts and for the corresponding SED variability, while the interspersed minor radio events could be interpreted as due either to some local distortions of the helical structure or to other phenomena contributing to the source emission. In particular, the probable existence of flow instabilities provides a viable interpretation for the non-periodic features.

arXiv comment14 pages, 7 eps figures, 1 jpg figure, A&A, in press

References in corpus (12)

• Unified Schemes for Radio-Loud Active Galactic Nuclei
• Multi-Epoch VLBA Observations of EGRET-Detected Quasars and BL Lac Objects: Superluminal Motion of Gamma-Ray Bright Blazars
• The Difference between Radio-Loud and Radio-Quiet Active Galaxies
• Optical and radio behaviour of the BL Lacertae object 0716+714
• Black hole mass and spin coevolution by mergers
• Optical and radio variability of the BL Lac object AO 0235+16: a possible 5-6 year periodicity
• The WEBT BL Lac Campaign 2000
• The first COMPTEL Source Catalogue
• On the soft X-ray spectra of gamma-loud blazars
• A 5 GHz Southern Hemisphere VLBI Survey of Compact Radio SOurces - I
• Dual-Frequency VSOP Observations of AO 0235+164
• A Millimetre/Submillimetre Polarisation Survey of Compact Flat-Spectrum Radio Sources

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• Long-term variability of extragalactic radio sources in the Planck Early Release Compact Source Catalogue
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• Investigating the peculiar emission from the new VHE gamma-ray source H1722+119
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• SDSS J1130+0058 an X-shaped Radio Source With Double-Peaked Low-Ionization Emission Lines: A binary Black Hole System?
• Optical Monitoring of PKS 1510-089: A Binary Black Hole System?
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• Interpreting the variation phenomena of B2 1633+382 via the two-component model
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