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http://hdl.handle.net/20.500.12386/27221
Titolo: | A model for periodic blazars | Autori: | SOBACCHI, Emanuele Sormani, Mattia C. STAMERRA, Antonio |
Data pubblicazione: | 2017 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 465 | Fascicolo: | 1 | Da pagina:: | 161 | Abstract: | We describe a scenario to explain blazar periodicities with time-scales of ∼ few years. The scenario is based on a binary supermassive black hole (SMBH) system in which one of the two SMBHs carries a jet. We discuss the various mechanisms that can cause the jet to precess and produce corkscrew patterns through space with a scale of ∼ few pc. It turns out that the dominant mechanism responsible for the precession is simply the imprint of the jet-carrying SMBH orbital speed on the jet. Gravitational deflection and Lense-Thirring precession (due to the gravitational field of the other SMBH) are second-order effects. We complement the scenario with a kinematical jet model which is inspired to the spine-sheath structure observed in M87. One of the main advantages of such a structure is that it allows the peak of the synchrotron emission to scale with frequency according to νF ∝ ν<SUP>ξ</SUP> as the viewing angle is changed, where ξ is not necessarily 3 or 4 as in the case of jets with uniform velocity, but can be ξ ∼ 1. Finally, we apply the model to the source PG1553+113, which has been recently claimed to show a T<SUB>obs</SUB> = (2.18 ± 0.08) yr periodicity. We are able to reproduce the optical and gamma-ray light curves and multiple synchrotron spectra simultaneously. We also give estimates of the source mass and size. | URI: | http://hdl.handle.net/20.500.12386/27221 | URL: | https://academic.oup.com/mnras/article/465/1/161/2417411 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stw2684 | Bibcode ADS: | 2017MNRAS.465..161S | Fulltext: | open |
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