Accueil > Séminaires d’Astrophysique > Automne 2006 > The physics of radio galaxies at small and large scale


The physics of radio galaxies at small and large scale

Elena Belsole (Institute of Astronomy, Cambridge, UK)

Par Stephane Charpinet - 8/01/2007


Séminaires d’Astrophysique

de l’Observatoire Midi-Pyrénées

Séminaire de 


(Institute of Astronomy, Cambridge, UK)

Jeudi 8 Juin 2006 à 11h

OMP - Salle Coriolis

The physics of radio galaxies at small and large scale

Active galaxies are the most powerful engines in the Universe for converting gravitational energy into radiation. Their study at all epochs is fundamental to map the energy evolution of the Universe and the large scale structure. Powerful radio-loud quasars and radio galaxies have the added advantage that, since their radio jets need X-ray-emitting gas as a medium in which to propagate, the sources can be used as cosmological probes to trace significant atmospheres at high redshift. The radio emission is used as a measure of source orientation, and sensitive X-ray measurements can be used to derive important results on the physical structures on a range of sizes from the cores to the large-scale components. I will present the physical properties of radio galaxies at different redshift and I will show results from a significant sample of powerful radio galaxies and quasars at z > 0.5. Using high-quality observations I will discuss the X-ray properties of the cores, jets, lobes and cluster gas, and draw conclusions about the nature of the emission from the different components.



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