The X-ray ribs within the cocoon shock of Cygnus A
| Autor: | Alastair C. Edge, Bradford Snios, Michael W. Wise, William G. Mathews, Robert Laing, Martin J. Hardcastle, Paul Nulsen, Ryan T. Duffy, M. N. de Vries, Leith Godfrey, Chris Carilli, D. Rafferty, Mark Birkinshaw, Judith H. Croston, Richard A. Perley, Brian R. McNamara, John McKean, Diana M Worrall |
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| Přispěvatelé: | High Energy Astrophys. & Astropart. Phys (API, FNWI), Sterrenkunde |
| Rok vydání: | 2018 |
| Předmět: |
active [Galaxies]
Astrophysics::High Energy Astrophysical Phenomena galaxies: active FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences galaxies: individual: Cygnus A 0103 physical sciences Cluster (physics) Cygnus A 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics High Energy Astrophysical Phenomena (astro-ph.HE) Physics radio continuum: galaxies Jet (fluid) Shock (fluid dynamics) 010308 nuclear & particles physics Astronomy and Astrophysics Debris Astrophysics - Astrophysics of Galaxies Galaxy galaxies [X-rays] Core (optical fiber) Temperature gradient X-rays: galaxies galaxies: active galaxies: individual: Cygnus A radio continuum: galaxies X-rays: galaxies Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Astrophysics of Galaxies Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) individual: Cygnus A- radio continuum: galaxies [Galaxies] Astrophysics - High Energy Astrophysical Phenomena |
| Zdroj: | Duffy, R T, Worrall, D M, Birkinshaw, M, Nulsen, P E J, Wise, M W, de Vries, M N, Snios, B, Mathews, W G, Perley, R A, Hardcastle, M J, Rafferty, D A, McNamara, B R, Edge, A C, McKean, J P, Carilli, C L, Croston, J H, Godfrey, L E H & Laing, R A 2018, ' The X-ray ribs within the cocoon shock of Cygnus A ', Monthly Notices of the Royal Astronomical Society, vol. 476, no. 4, pp. 4848-4860 . https://doi.org/10.1093/mnras/sty549 Monthly Notices of the Royal Astronomical Society, 476(4), 4848-4860. Oxford University Press Monthly notices of the Royal Astronomical Society, 2018, Vol.476(4), pp.4848-4860 [Peer Reviewed Journal] |
| ISSN: | 1365-2966 0035-8711 |
| Popis: | We use new and archival Chandra observations of Cygnus A, totalling $\sim$1.9 Ms, to investigate the distribution and temperature structure of gas lying within the projected extent of the cocoon shock and exhibiting a rib-like structure. We confirm that the X-rays are dominated by thermal emission with an average temperature of around 4 keV, and have discovered an asymmetry in the temperature gradient, with the southwestern part of the gas cooler than the rest by up to 2 keV. Pressure estimates suggest that the gas is a coherent structure of single origin located inside the cocoon, with a mass of roughly $2\times10^{10} M_{\odot}$. We conclude that the gas is debris resulting from disintegration of the cool core of the Cygnus A cluster after the passage of the jet during the early stages of the current epoch of activity. The 4 keV gas now lies on the central inside surface of the hotter cocoon rim. The temperature gradient could result from an offset between the centre of the cluster core and the Cygnus A host galaxy at the switch-on of current radio activity. 15 pages, 12 figures, accepted by MNRAS |
| Databáze: | OpenAIRE |
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