LOFAR and APERTIF Surveys of the Radio Sky: Probing Shocks and Magnetic Fields in Galaxy Clusters

Journal of astrophysics and astronomy

Emanuela Orrù1¹  Jose Afonso^6,12  Krzysztof Chyży¹⁰  George Miley⁶  Huub Röttgering1⁶  Marcus Brüggen^5,6  Raffaella Morganti3 1⁷  John Conway^6,13  Philip Best¹⁵  Giulia Macario⁸  Roberto Pizzo1^6,9  John McKean1^6,9  Ilse van Bemmel1^6,9  Marijke Haverkorn11 12 1¹¹  Cyril Tasse1^6,17  George Heald1¹  Michael Wise1^6,9  Gianfranco Brunetti⁸  Glenn White1^3,6  Chiara Ferrari10^6,14  Francesco De Gasperin^6,19  Marc Verheijen⁷  Matt Lehnert1^6,17  Reinout van Weeren⁶  Annalisa Bonafede^5,6  Fabien Batejat^6,13  Bas van der Tol⁶  Neal Jackson1²  Matthias Hoeft1^4,6  Matt Jarvis1¹⁶  Tom Oosterloo3 1⁷  Alexander Shulevski⁷  David Rafferty⁶  Peter Barthel⁷  Louise Ker1^6,18 

[1] Radboud University Nijmegen, Heijendaalseweg 135, 6525 AJ Nijmegen, The Netherlands.$$;Jodrell Bank Centre for Astrophysics, University of Manchester, Turing Building, Oxford Road, Manchester M13 9PL, UK.$$;Department of Physics and Astronomy, The Open University, Milton Keynes, MK7 6AA, Space Science and Technology Department, STFC Rutherford Appleton Laboratory, Chilton, OX11 0QX, UK.$$;Thüringer Landessternwarte, Tautenburg, Germany.$$;Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany.$$;Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands.$$;Kapteyn Instituut, Landleven 12, 9747 AD Groningen, The Netherlands.$$;INAF, Istituto di Radioastronomia, Via P Gobetti 101, IT 40129, Bologna, Italy.$$;ASTRON, PO Box 2, 7990 AA Dwingeloo, The Netherlands.$$;Jagiellonian University, ul. Orla 171 30-244 Kraków POLAND.$$;Sterrewacht Leiden, P.O. Box 9513, 2300 RA Leiden, The Netherlands$$;Observatório Astronómico de Lisboa, Faculdade de Ciências, Universidade de Lisboa, Tapada da Ajuda, 1349-018 Lisbon, Portugal.$$;Chalmers University of Technology, Onsala Space Observatory, SE 439 92 Onsala, Sweden.$$;UNS, CNRS UMR 6202 Cassiopée, Observatoire de la Cote d’Azur, Nice, France.$$;Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK.$$;Centre for Astrophysics, University of Hertfordshire, Hatfield, Herts, UK.$$;Observatoire de Paris, 5 Place Jules Janssen, 92195 Meudon, France.$$;Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK$$;Max-Planck-Institut für Astrophysik, Karl-Schwarzschildstraβe 1, 85741 Garching, Germany.$$

关键词: Galaxies: clusters: general;    intracluster medium;    radio continuum: galaxies;    radio telescopes.;   

DOI  :  

学科分类：天文学(综合)

来源: Indian Academy of Sciences

【 摘 要 】

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.

【 授权许可】

Unknown