AC3 - Accretion discs and jets |
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Speaker |
Kun, Emma |
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Coauthors |
Karouzos, Marios; Gabányi, Krisztina Éva; Britzen, Silke; Gergely, Árpád László |
| Talk Title |
The evolution of the jet of S5 1803+784 identified from very long baseline radio interferometry |
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Abstract |
I discuss observable properties of the flat-spectrum jets of active galactic nuclei, focusing on the evolution of their structure, as revealed by very long baseline interferometry in radio frequencies. As an example I analyse an interesting source, the jet of BL Lac object S5 1803+784 at z = 0.679. Its VLBI observations spanning over two decades show that in contrast to what has been observed in the majority of other VLBI jets, the components building up its surface brightness distribution do not exhibit outward motion, but rather they maintain globally the same position. The long-term behaviour of the ridge line suggests that the jet experiences an oscillatory motion on a time-scale of about 6 years, superposed onto its helical jet kinematics. The temporal variability in the Doppler boosting of the ridge line results in jet regions behaving as flaring "radio lanterns". |
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Talk view |
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