Articles written in Journal of Astrophysics and Astronomy
Volume 32 Issue 4 December 2011 pp 557-566
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.
Volume 32 Issue 4 December 2011 pp 589-598
George Heald Michael R. Bell Andreas Horneffer André R. Offringa Roberto Pizzo Sebastiaan van der Tol Reinout J. van Weeren Joris E. van Zwieten James M. Anderson Rainer Beck Ilse van Bemmel Laura Bîrzan Annalisa Bonafede John Conway Chiara Ferrari Francesco De Gasperin Marijke Haverkorn Neal Jackson Giulia Macario John McKean Halime Miraghaei Emanuela Orrù David Rafferty Huub Röttgering Anna Scaife Aleksandar Shulevski Carlos Sotomayor Cyril Tasse Monica Trasatti Olaf Wucknitz
The Low-Frequency Array (LOFAR) is under construction in the Netherlands and in several surrounding European countries. In this contribution, we describe the layout and design of the telescope, with particular emphasis on the imaging characteristics of the array when used in its `standard imaging’ mode. After briefly reviewing the calibration and imaging software used for LOFAR image processing, we show some recent results from the ongoing imaging commissioning efforts. We conclude by summarizing future prospects for the use of LOFAR in observing the little-explored low-frequency Universe.
Volume 40 | Issue 5
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