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A very brief description of LOFAR – the Low Frequency Array

Published online by Cambridge University Press:  01 August 2006

Heino D. Falcke
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl Department of Astronomy, Radboud University, Nijmegen, the Netherlands
Michiel P. van Haarlem
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
A. Ger de Bruyn
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands
Robert Braun
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Huub J.A. Röttgering
Affiliation:
Leiden Observatory, Leiden University, Leiden, the Netherlands
Benjamin Stappers
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl Astronomical Institute Anton Pannekoek, University of Amsterdam, the Netherlands
Wilfried H.W.M. Boland
Affiliation:
Leiden Observatory, Leiden University, Leiden, the Netherlands
Harvey R. Butcher
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Eugène J. de Geus
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Leon V. Koopmans
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands
Robert P. Fender
Affiliation:
Astronomical Institute Anton Pannekoek, University of Amsterdam, the Netherlands School of Physics & Astronomy, University of Southampton, Southampton, SO17 1BJ, UK
H. Jan M.E. Kuijpers
Affiliation:
Department of Astronomy, Radboud University, Nijmegen, the Netherlands
George K. Miley
Affiliation:
Leiden Observatory, Leiden University, Leiden, the Netherlands
Richard T. Schilizzi
Affiliation:
Leiden Observatory, Leiden University, Leiden, the Netherlands International SKA Project Office, c/o ASTRON, Dwingeloo, the Netherlands
Corina Vogt
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Ralph A.M.J. Wijers
Affiliation:
Astronomical Institute Anton Pannekoek, University of Amsterdam, the Netherlands
Michael W. Wise
Affiliation:
Astronomical Institute Anton Pannekoek, University of Amsterdam, the Netherlands
Willem N. Brouw
Affiliation:
Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands
Johan P. Hamaker
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Jan E. Noordam
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Thomas Oosterloo
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Lars Bähren
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl Department of Astronomy, Radboud University, Nijmegen, the Netherlands
Michiel A. Brentjens
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl Kapteyn Astronomical Institute, Groningen University, Groningen, the Netherlands
Stefan J. Wijnholds
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Jaap D. Bregman
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Wim A. van Cappellen
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
André W. Gunst
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
G.W. (Dion) Kant
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Jan Reitsma
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Kjeld van der Schaaf
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
Cornelis M. de Vos
Affiliation:
ASTRON, Postbus 2, NL-7990AA Dwingeloo, the Netherlands email: falcke@astron.nl
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Abstract

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LOFAR (Low Frequency Array) is an innovative radio telescope optimized for the frequency range 30–240 MHz. The telescope is realized as a phased aperture array without any moving parts. Digital beam forming allows the telescope to point to any part of the sky within a second. Transient buffering makes retrospective imaging of explosive short-term events possible. The scientific focus of LOFAR will initially be on four key science projects (KSPs): (i) Detection of the formation of the very first stars and galaxies in the universe during the so-called epoch of reionization by measuring the power spectrum of the neutral hydrogen 21-cm line (Shaver et al. 1999) on the ∼ 5′ scale; (ii) Low-frequency surveys of the sky with of order 108 expected new sources; (iii) All-sky monitoring and detection of transient radio sources such as γ-ray bursts, X-ray binaries, and exo-planets (Farrell et al. 2004); and (iv) Radio detection of ultra-high energy cosmic rays and neutrinos (Falcke & Gorham 2003) allowing for the first time access to particles beyond 1021 eV (Scholten et al. 2006). Apart from the KSPs open access for smaller projects is also planned. Here we give a brief description of the telescope.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2007

References

Bregman, J. D. 2000, in: Butcher, H.R. (ed.), Radio Telescopes, Proc. SPIE 4015, 19Google Scholar
Falcke, H., & Gorham, P. 2003, Astropart. Phys., 19, 477CrossRefGoogle Scholar
Farrell, W. M., Lazio, T. J. W., Zarka, P., et al. 2004, Planet. Space Sci., 52, 1469CrossRefGoogle Scholar
Scholten, O., Bacelar, J., Braun, R., et al. 2006, Astropart. Phys., 26, 219CrossRefGoogle Scholar
Shaver, P. A., Windhorst, R. A., Madau, P., & de Bruyn, A. G. 1999, A&A, 345, 380Google Scholar
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