Astronomy and Astrophysics – Astrophysics
Scientific paper
1999-07-09
Astronomy and Astrophysics
Astrophysics
4 pages, plus 2 .ps figures, Latex, to appear in proceedings of the Ringberg workshop on 'Diffuse Thermal and Relativistic Pla
Scientific paper
It is pointed out that copius X-rays from the lobes of FRII radio galaxies are expected as a natural consequence of the unification linking FRIIs and radio-loud quasars. The detection of extended X-ray emission from 3C 219, likely due to Inverse Compton scattering of the IR photons from a hidden quasar with the relativistic electrons in the lobes, provides the first observational evidence supporting this conjecture. The X-ray fluxes detected in the directions of other five pwerful FRIIs with large redshifts may be similarly accounted for (an alternative to a thermal origin from hot intracluster gas). Much less energetic electrons than those producing the synchrotron radio emission are involved in the process. Then the equipartition conditions imply stronger fields, and significantly stronger internal pressures of the relativic plasmas, than those derived with conventional equipartition equations. The importance of this effect in the pressure balance with the confining intergalactic gas is pointed out.
Brunetti Gf.
Comastri Andrea
Setti Giancarlo
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