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A very brief description of LOFAR – the Low Frequency Array

2006; Cambridge University Press; Volume: 2; Issue: 14 Linguagem: Inglês

10.1017/s174392130701112x

1743-9221

H. Falcke, M. P. van Haarlem, A. G. de Bruyn, Róbert Braun, H. J. A. Röttgering, B. W. Stappers, Wilfried H.W.M. Boland, H. R. Butcher, E. J. De Geus, L. V. E. Koopmans, R. P. Fender, H. Jan M.E. Kuijpers, G. K. Miley, R. T. Schilizzi, C. Vogt, R. A. M. J. Wijers, M. W. Wise, Willem N. Brouw, J. P. Hamaker, J. E. Noordam, Tom Oosterloo, L. Bähren, M. A. Brentjens, Stefan J. Wijnholds, J. D. Bregman, W. A. van Cappellen, A. W. Gunst, G. W. Kant, J. Reitsma, K. van der Schaaf, Cornelis M. de Vos,

Gamma-ray bursts and supernovae

Abstract 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 10 8 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 10 21 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.