LOFAR and APERTIF surveys of the radio sky: probing shocks and magnetic fields in galaxy clusters
Huub Rottgering, Jose Afonso, Peter Barthel, Fabien Batejat, Philip Best, Annalisa Bonafede, Marcus Bruggen, Gianfranco Brunetti, Krzysztof Chyzy, John Conway, … 展开作者
Huub Rottgering, Jose Afonso, Peter Barthel, Fabien Batejat, Philip Best, Annalisa Bonafede, Marcus Bruggen, Gianfranco Brunetti, Krzysztof Chyzy, 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 Orru, Roberto Pizzo, David Rafferty, Alexander Shulevski, Cyril Tasse, Ilse van Bemmel, Bas van der Tol, Reinout van Weeren, Marc Verheijen, Glenn White, Michael Wise
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11 pages, 2 figures, Invited talk at the conference "Diffuse Relativistic Plasmas", Bangalore, 1-4 March 2011; in press for publication in special issue of Journal of Astrophysics and Astronomy
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 \sim 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 fundamental issues related 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.
Probing Primordial Black Holes with upcoming Radio Telescopes: a case study for LOFAR2.0, FAST Core Array and BINGO
Universidade Federal de Campina Grande（坎皮纳格兰德联邦大学）；Leibniz University Hannover（汉诺威莱布尼茨大学）；Ruprecht-Karls-Universität Heidelberg（海德堡大学）；Max Planck Institute for Gravitational Physics, Albert Einstein Institute（马克斯·普朗克引力物理研究所，爱因斯坦研究所）
The topology of the magnetic field in Abell 2255 out to its virial radius. Results from the LOFAR Galaxy Cluster Ultra-Deep Field
INAF - IRA（意大利国家天体物理研究所-博洛涅分院）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；Institute for Advanced Study（普林斯顿高等研究院）；Dipartimento di Fisica e Astronomia, Università di Bologna（博洛尼亚大学物理与天文学系）；Center for Astrophysics Harvard & Smithsonian（哈佛&史密森尼天体物理中心）；Department of Astronomy, University of Wisconsin-Madison（威斯康星大学麦迪逊分校天文学系）；ASTRON, the Netherlands Institute for Radio Astronomy（荷兰射电天文研究所）；Hamburger Sternwarte, Universität Hamburg（汉堡大学汉堡天文台）；INAF - IASF Milano（意大利国家天体物理研究所-米兰天文物理研究所）
Radio U-Net: a convolutional neural network to detect diffuse radio sources in galaxy clusters and beyond
Istituto di Radio Astronomia, INAF（意大利国家天体物理研究所射电天文研究所）；Dipartimento di Fisica e Astronomia, Universitá di Bologna（博洛尼亚大学物理与天文系）；Hamburger Sternwarte（汉堡天文台）
