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A LOFAR-uGMRT spectral index study of distant radio halos

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 large-scale turbulence. Aims. Current re-acceleration models predi...

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Bibliographic Details
Published in:Astronomy and astrophysics (Berlin) 2021-10, Vol.654, p.A166
Main Authors: Di Gennaro, G., van Weeren, R. J., Cassano, R., Brunetti, G., Brüggen, M., Hoeft, M., Osinga, E., Botteon, A., Cuciti, V., de Gasperin, F., Röttgering, H. J. A., Tasse, C.
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Language:English
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Summary: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 large-scale turbulence. Aims. Current re-acceleration models predict that a significant number of halos at high redshift should be characterised by very steep spectra ( α  
ISSN:0004-6361
1432-0746
1432-0756
DOI:10.1051/0004-6361/202141510