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Young cavities in the X-ray emitting hot gas in galaxy clusters are oftenfilled with radio synchrotron emission and it is widely thought that thecavities are inflated by these cosmic rays. At a later stage of its evolution,when the cavity becomes buoyant, the converging flow of gas beneath the cavityresults in a filament of thermal gas, a cavity jet, that moves radially outwardat large subsonic velocities. As the cavity jet forms, the cosmic ray electronsmay diffuse through the cavity walls, filling a large volume surrounding thecavity jet, as observed in M87/Virgo and elsewhere, sometimes referred to asrelic radio sources. We compute the combined evolution of cosmic rays, cavitiesand cavity jets. The observed pattern in M87/Virgo can be reached in 100 Myrs,matching the synchrotron age of the extended radio source. A 20-30 kpc longcavity jet is surrounded by a quasi-spherical radio lobe 40 kpc in diameter,but the initial cavity has disappeared. At later times the cavity jet will fallback to the origin, leaving only the extended radio source. The combinedjet-lobe evolution in M87/Virgo requires a total cosmic ray energy that is morethan 10 times larger than that usually assumed, 4PV.

Creation of the X-ray Cavity Jet and its Radio Lobe in M87/Virgo with Cosmic Rays; Relevance to Relic Radio Sources