Testing minimum energy with powerful radio sources in clusters of galaxies

Details Testing minimum energy with powerful radio sources in clusters of galaxies Testing minimum energy with powerful radio sources in clusters of galaxies

1999-09-07

arxiv.org/abs/astro-ph/9909121v1

New Astron.Rev. 46 (2002) 117-120

Astronomy and Astrophysics

Astrophysics

6 pages, including 2 figures, to appear in `Life Cycles of Radio Galaxies', ed. J. Biretta et al., New Astronomy Reviews

Scientific paper

10.1016/S1387-6473(01)00166-X

We analyze ROSAT data for cluster gas surrounding powerful radio galaxies, which is well fitted by a ``beta-model'' gas distribution, after allowing for a compact central source. The cluster thermal pressure at the distance of the radio lobes is typically an order of magnitude larger than the lobe minimum pressure. Since radio lobes are sharply-bounded, the missing pressure is not simply entrained intra-cluster gas. Thus the minimum energy in the lobes is a severe underestimate of the actual energy content. We argue that the extra energy is mostly in the form of particles, so that the magnetic field is below equipartition and thus not a major factor in the lobe dynamics. The large departure from minimum energy has far-reaching implications for the nature of AGN central engines and the supply of mechanical energy to the cluster gas.

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