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Observing pulsars and fast transients with LOFAR

B. W. Stappers 1 J. W. T. Hessels 2 A. Alexov 3 K. Anderson T. Coenen 3 T. Hassall A. Karastergiou 4 V. I. Kondratiev 5 M. Kramer 6 J. van Leeuwen 2 J. D. Mol A. Noutsos 6 J. W . Romein P. Weltevrede R. Fender 7 R. A. M. J. Wijers L. Bähren 3 M. E. Bell J. Broderick 7 E. J. Daw 8 V. S. Dhillon 8 J. Eislöffel 9 H. Falcke Jean-Mathias Grießmeier 10, 11 C. Law 3 S. Markoff 3 J. C. A. Miller-Jones 3 B. Scheers 3 H. Spreeuw 3 J. Swinbank 3 S. ter Veen 12 M. W. Wise 5, 3 O. Wucknitz 13 P. Zarka 14 J. Anderson A. Asgekar 5 I. M. Avruch 15 R. Beck P. Bennema M. J. Bentum 5 P. Best J. Bregman 5 M. Brentjens 5 R. H. van de Brink 5 P. C. Broekema W. N. Brouw 16 M. Brüggen 17 A. G. de Bruyn 16 H. R. Butcher 5 B. Ciardi 18 J. Conway R. -J. Dettmar 19 A. van Duin J. van Enst M. Garrett 5, 20 M. Gerbers 5 T. Grit 5 A. Gunst 5 M. P. van Haarlem 5 J. P. Hamaker G. Heald 5 M. Hoeft 9 H. Holties 5 A. Horneffer L. V. E. Koopmans 16 G. Kuper 5 M. Loose P. Maat 5 D. Mckay-Bukowski J. P. Mckean 5 G. Miley R. Morganti 16 R. Nijboer 5 J. E. Noordam 5 M. Norden H. Olofsson M. Pandey-Pommier 21 A. Polatidis 5 W. Reich 6 H. Röttgering 20 A. Schoenmakers 5 J. Sluman 5 O. Smirnov M. Steinmetz C. G. M. Sterks Michel Tagger 11 Y. Tang R. Vermeulen 5 N. Vermaas C. Vogt 5 M. de Vos S. J. Wijnholds 5 S. Yatawatta 5 A. Zensus 6
Abstract : Low frequency radio waves, while challenging to observe, are a rich source of information about pulsars. The LOw Frequency ARray (LOFAR) is a new radio interferometer operating in the lowest 4 octaves of the ionospheric "radio window": 10-240MHz, that will greatly facilitate observing pulsars at low radio frequencies. Through the huge collecting area, long baselines, and flexible digital hardware, it is expected that LOFAR will revolutionize radio astronomy at the lowest frequencies visible from Earth. LOFAR is a next-generation radio telescope and a pathfinder to the Square Kilometre Array (SKA), in that it incorporates advanced multi-beaming techniques between thousands of individual elements. We discuss the motivation for low-frequency pulsar observations in general and the potential of LOFAR in addressing these science goals. We present LOFAR as it is designed to perform high-time-resolution observations of pulsars and other fast transients, and outline the various relevant observing modes and data reduction pipelines that are already or will soon be implemented to facilitate these observations. A number of results obtained from commissioning observations are presented to demonstrate the exciting potential of the telescope. This paper outlines the case for low frequency pulsar observations and is also intended to serve as a reference for upcoming pulsar/fast transient science papers with LOFAR.
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B. W. Stappers, J. W. T. Hessels, A. Alexov, K. Anderson, T. Coenen, et al.. Observing pulsars and fast transients with LOFAR. Astronomy and Astrophysics - A&A, EDP Sciences, 2011, 530, pp.A80. ⟨10.1051/0004-6361/201116681⟩. ⟨insu-01310941⟩

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