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VLBI observations o...
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Perucho, ManelUniversitat de Valencia
(författare)
VLBI observations of helical jets: Hints on the nature of radio-jets
- Artikel/kapitelEngelska2012
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LIBRIS-ID:oai:research.chalmers.se:8747e170-4ec4-4d54-87b8-4357bfd63c94
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https://research.chalmers.se/publication/533239URI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:kon swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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We make use of VLBI observations of the radio jet in the quasar S5 0836+710 at different frequencies and epochs to study its properties. The jet shows helical structure at all frequencies. The ridge-line of the emission in the jet coincides at all frequencies and epochs, within the errors. We conclude that the helicity is a real, physical structure. Small differences between epochs reveal wave-like motion of the ridge-line transversal to the jet propagation axis. These transversal motions are measured to be superluminal. This unphysical result could correspond to a possible small amplitude oscillation of the ridge-line at the radio-core and to large errors in the determination of the positions. In addition, higher resolution images at 15 GHz show that the ridge-line does not coincide exactly with the centre of the radio jet. At arc-second scales, this powerful jet shows non-collimated, irregular structure and a lack of a hot-spot. Following this collection of evidence, we conclude that the ridge-line could be related to a pressure maximum within the jet cross-section, associated with the observed helical pattern that could lead to jet disruption at longer scales.
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Kovalev, Yuri Y.Astro Space Center of Lebedev Physical Institute
(författare)
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Hardee, PhilipUniversity of Alabama
(författare)
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Lobanov, Andrei P.Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy
(författare)
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Agudo, IvanAgencia Estatal Consejo Superior de Investigaciones Científicas,Spanish National Research Council
(författare)
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Marti-Vidal, Ivan,1980Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)mivan
(författare)
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Universitat de ValenciaAstro Space Center of Lebedev Physical Institute
(creator_code:org_t)
Sammanhörande titlar
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Ingår i:Proceedings of Science2012-October1824-8039
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