A LOFAR-uGMRT spectral index study of distant radio halos
G. Di Gennaro,
R. J. van Weeren,
R. Cassano
et al.
Abstract:Context. Radio halos are megaparsec-scale diffuse radio sources mostly located at the centres of merging galaxy clusters. The common mechanism invoked to explain their origin is the re-acceleration of relativistic particles caused by largescale turbulence. Aims. Current re-acceleration models predict that a significant number of halos at high redshift should be characterised by very steep spectra (α < −1.5) because of increasing inverse Compton energy losses. In this paper, we investigate the spectral index pr… Show more
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