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Collimation,Acceleration, andRecollimation Shockin the Jet ofGamma-Ray EmittingRadio-loudNarrow-line Seyfert 1Galaxy 1H0323+342 Kazuhiro HadaAkihiro DoiKiyoaki Wajima2018 год

Collimation, Acceleration, and Recollimation Shock in the Jet of Gamma-Ray Emitting Radio-loud Narrow-line Seyfert 1 Galaxy 1H0323+342
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Аннотация: Abstract We investigated the detailed radio structure of the jet of 1H 0323+342 using high-resolution multifrequency Very Long Baseline Array observations. This source is known as the nearest γ -ray emitting radio-loud narrow-line Seyfert 1 (NLS1) galaxy. We discovered that the morphology of the inner jet is well characterized by a parabolic shape, indicating that the jet is continuously collimated near the jet base. On the other hand, we found that the jet expands more rapidly at larger scales, resulting in a conical shape. The location of the “collimation break” is coincident with a bright quasi-stationary feature at 7 mas from core (corresponding to a deprojected distance on the order of ∼100 pc), where the jet width locally contracts together with highly polarized signals, suggesting a recollimation shock. We found that the collimation region is coincident with the region where the jet speed gradually accelerates, suggesting a coexistence of the jet acceleration and collimation zone, ending up with the recollimation shock, which could be a potential site of high-energy γ -ray flares detected by the Fermi -LAT. Remarkably, these observational features of the 1H 0323+342 jet are overall very similar to those of the nearby radio galaxy M87 and HST-1 as well as some blazars, suggesting that a common jet formation mechanism might be at work. Based on the similarity of the jet profile of the two sources, we also briefly discuss the mass of the central black hole of 1H 0323+342, which is also still highly controversial in this source and NLS1s in general.
Год издания: 2018
Авторы: Kazuhiro Hada, Akihiro Doi, Kiyoaki Wajima, F. D’Ammando, M. Orienti, M. Giroletti, G. Giovannini, Masanori Nakamura, Keiichi Asada
Издательство: IOP Publishing
Источник: The Astrophysical Journal
Ключевые слова: Astrophysics and Cosmic Phenomena, Radio Astronomy Observations and Technology, Gamma-ray bursts and supernovae
Другие ссылки: The Astrophysical Journal (PDF)
The Astrophysical Journal (HTML)
arXiv (Cornell University) (PDF)
arXiv (Cornell University) (HTML)
Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (PDF)
Archivio istituzionale della ricerca (Alma Mater Studiorum Università di Bologna) (HTML)
DataCite API (HTML)