research product . 2009

High-energy particle acceleration at the radio-lobe shock of Centaurus A

Croston, J.H.; Kraft, R.P.; Hardcastle, M.J.; Birkinshaw, M.; Worrall, D.M.; Nulsen, P.E.J.; Penna, R.F.; Sivakoff, G.R.; Jordan, R.; Brassington, Nicola; ...
Open Access English
  • Published: 01 Jan 2009
Abstract
We present new results on the shock around the south-west radio lobe of Centaurus A using data from the Chandra Very Large Programme observations (740 ks total observing time). The X-ray spectrum of the emission around the outer south-western edge of the lobe is well described by a single power-law model with Galactic absorption – thermal models are strongly disfavoured, except in the region closest to the nucleus. We conclude that a significant fraction of the X-ray emission around the south-west part of the lobe is synchrotron, not thermal. We infer that in the region where the shock is strongest and the ambient gas density lowest, the inflation of the lobe is...
Subjects
arXiv: Astrophysics::High Energy Astrophysical PhenomenaAstrophysics::Galaxy AstrophysicsAstrophysics::Cosmology and Extragalactic Astrophysics
free text keywords: X-Rays: Galaxies, Galaxies: Active, Radio Continuum: Galaxies, Shock Waves, Galaxies: Elliptical And Lenticular: Cd, Galaxies: Individual: Cen A
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