LOFAR and APERTIF Surveys of the Radio Sky: Probing Shocks and Magnetic Fields in Galaxy Clusters
Huub Röttgering Jose Afonso Peter Barthel Fabien Batejat Philip Best Annalisa Bonafede Marcus Brüggen Gianfranco Brunetti Krzysztof Chyży John Conway Francesco De Gasperin Chiara Ferrari Marijke Haverkorn George Heald Matthias Hoeft Neal Jackson Matt Jarvis Louise Ker Matt Lehnert Giulia Macario John McKean George Miley Raffaella Morganti Tom Oosterloo Emanuela Orrù Roberto Pizzo David Rafferty Alexander Shulevski Cyril Tasse Ilse van Bemmel Bas van der Tol Reinout van Weeren Marc Verheijen Glenn White Michael Wise
At very low frequencies, the new pan-European radio telescope LOFAR is opening the last unexplored window of the electromagnetic spectrum for astrophysical studies. The revolutionary APERTIF-phased arrays that are about to be installed on the Westerbork radio telescope (WSRT) will dramatically increase the survey speed for the WSRT. Combined surveys with these two facilities will deeply chart the northern sky over almost two decades in radio frequency from ∼ 15 up to 1400 MHz. Here we briefly describe some of the capabilities of these new facilities and what radio surveys are planned to study fun-damental issues related to the formation and evolution of galaxies and clusters of galaxies. In the second part we briefly review some recent observational results directly showing that diffuse radio emission in clusters traces shocks due to cluster mergers. As these diffuse radio sources are relatively bright at low frequencies, LOFAR should be able to detect thousands of such sources up to the epoch of cluster formation. This will allow addressing many question about the origin and evolution of shocks and magnetic fields in clusters. At the end we briefly review some of the first and very preliminary LOFAR results on clusters.
Huub Röttgering1 Jose Afonso2 Peter Barthel3 Fabien Batejat4 Philip Best5 Annalisa Bonafede6 Marcus Brüggen6 Gianfranco Brunetti7 Krzysztof Chyży8 John Conway4 Francesco De Gasperin9 Chiara Ferrari10 Marijke Haverkorn11 12 13 George Heald13 Matthias Hoeft14 Neal Jackson15 Matt Jarvis16 Louise Ker17 Matt Lehnert18 Giulia Macario7 John McKean12 George Miley1 Raffaella Morganti3 12 Tom Oosterloo3 12 Emanuela Orrù13 Roberto Pizzo12 David Rafferty1 Alexander Shulevski3 Cyril Tasse18 Ilse van Bemmel12 Bas van der Tol1 Reinout van Weeren1 Marc Verheijen3 Glenn White19 Michael Wise12
Volume 43, 2022
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