Are Cluster Radio Relics Revived Fossil Radio Cocoons?

Details Are Cluster Radio Relics Revived Fossil Radio Cocoons? Are Cluster Radio Relics Revived Fossil Radio Cocoons?

2000-10-30

arxiv.org/abs/astro-ph/0010600v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, uses newpasp.sty (included) and epsf.sty. To appear in R.A. Laing and K.M. Blundell (Eds.) 'Particles and

Scientific paper

A new model for the, so called, `cluster radio relics' is presented (Ensslin & Gopal-Krishna 2000). Fossil radio cocoons, resulting from the former activity of radio galaxies, should contain a low energy relativistic electron population and magnetic fields. Electrons with an age of even up to 2 Gyr can be re-accelerated adiabatically to radio emitting energies, if the fossil radio plasma gets compressed in an environmental shock wave. Such a wave can be caused by a merging event of galaxy clusters, or by the accretion onto galaxy clusters. An implication of this model is the existence of a population of diffuse, ultra-steep spectrum, very low-frequency radio sources located inside and possibly outside of clusters of galaxies, tracing the revival of aged fossil radio plasma by the shock waves associated with large-scale structure formation.

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