Spectral Properties of the Core and the VLBI-Jets of Cygnus A

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dc.creatorBach, U.
dc.creatorKrichbaum, T. P.
dc.creatorMiddelberg, E.
dc.creatorKadler, M.
dc.creatorAlef, W.
dc.creatorWitzel, A.
dc.creatorZensus, J. A.
dc.date2004-09-14
dc.date.accessioned2026-07-07T02:14:36Z
dc.date.available2026-07-07T02:14:36Z
dc.descriptionWe present a detailed VLBI study of the spectral properties of the inner core region of the radio galaxy Cygnus A at 5 GHz, 15 GHz, 22 GHz, 43 GHz and 86 GHz. Our observations include an epoch using phase-referencing at 15 GHz and 22 GHz and the first successful VLBI observations of Cygnus A at 86 GHz. We find a pronounced two-sided jet structure, with a steep spectrum along the jet and an inverted spectrum towards the counter-jet. The inverted spectrum and the frequency-dependent jet-to-counter-jet ratio suggest that the inner counter-jet is covered by a circum-nuclear absorber as it is proposed by the unified scheme.
dc.description2 pages, 2 figures, Proceedings of the 7th EVN Symposium held in Toledo, Spain in October 2004, needs evn2004.cls
dc.identifierhttps://arxiv.org/abs/astro-ph/0409330
dc.identifierhttp://arxiv.org/abs/astro-ph/0409330
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/8177
dc.subjectAstrophysics
dc.titleSpectral Properties of the Core and the VLBI-Jets of Cygnus A
dc.typetext

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