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• W3103096470 abstract "We present the first direct imaging of what may be the thick torus in the active galactic nucleus (AGN) of the archetype powerful radio galaxy Cygnus A, using the Jansky Very Large Array (VLA) at 18 GHz to 48 GHz, with a resolution down to 45 mas. Such a torus has long been a key component of AGN models, but direct imaging on the relevant physical scales in sources of extreme (quasar-like) luminosities, remains scarce. An elongated structure, perpendicular to the radio jets and centered on the core, is well resolved, with a full length of $0.48$ (528 pc), and a full width of $0.26$ (286 pc). The radio emission spectrum is consistent with optically thin free-free emission. We present a toy model of a flaring torus, with a half-opening angle for the poloidal region of $62^o$. The radio jets are oriented along the poles. The observations require a clumpy gas distribution, with the free-free emission dominated by clumps with densities $ge 4000$ cm$^{-3}$" @default.
• W3103096470 created "2020-11-23" @default.
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• W3103096470 date "2019-04-05" @default.
• W3103096470 modified "2023-10-17" @default.
• W3103096470 title "Imaging the Active Galactic Nucleus Torus in Cygnus A" @default.
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• W3103096470 doi "https://doi.org/10.3847/2041-8213/ab1019" @default.
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