Abstract
Radio halos are large amorphous regions of radio emitting plasma with sizes of order 1 Mpc (throughout, H 0 = 50 km s-1 Mpc -1) located in extremely rich clusters (for reviews, see Jaffe 1992; Feretti & Giovannini 1995). These sources are rare; only 10 or so are known. Despite the fact that all of these examples were discovered more than 10 or 20 years ago, their nature is still a mystery and a number of basic questions have not yet been answered satisfactorily.
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Röttgering, H.J.A. et al. (1998). The Connection between Radio Halos and Rich Clusters: The Case of A3667 and a Search for Distant Radio Halos. In: Bremer, M.N., Jackson, N., Pérez-Fournon, I. (eds) Observational Cosmology. Astrophysics and Space Science Library, vol 226. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5238-9_21
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