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2011•Comptes Rendus PhysiqueOpen access

LOFAR calibration and wide-field imaging

Cyril Tasse, Ger van Diepen, S. van der Tol, R. J. van Weeren, Joris E. van Zwieten, F. Batejat, S. Bhatnagar, Ilse van Bemmel, L. Bırzan, A. Bonafede, J. E. Conway, C. Ferrari, F. de Gasperin, K. Golap, G. Heald, N. Jackson, G. Macario, John McKean, Niruj R. Mohan, E. Orrú, R. Pizzo, D. A. Rafferty, Urvashi Rau, H. J. A. Röttgering, A. Shulevski

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Abstract

LOFAR is a revolutionary instrument, operating at low frequencies ( ν ≲ 240 MHz ). It will drive major breakthroughs in the area of observational cosmology, but its use requires the development of challenging techniques and algorithms. Since its field of view and sensitivity are increased by orders of magnitude as compared to the older generation of instruments, new technical problems have to be addressed. The LOFAR survey team is in charge of commissioning the first LOFAR data produced in the imager mode as part of building the imaging pipeline. We are developing algorithms to tackle the problems associated with calibration (ionosphere, beam, etc.) and wide-field imaging for the achievement of the deep extragalactic surveys. New types of problems arise in that context, and notions such as algorithmic complexity and parallelism become fundamental.

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What this paper is about

LOFAR is a revolutionary instrument, operating at low frequencies ( ν ≲ 240 MHz ). It will drive major breakthroughs in the area of observational cosmology, but its use requires the development of challenging techniques and algorithms. Since its field of view and sensitivity are increased by orders of magnitude as compared to the older generation of instruments, new technical problems have to be addressed. The LOFAR survey team is in charge of commissioning the first LOFAR data produced in the imager mode as part of building the imaging pipeline. We are developing algorithms to tackle the problems associated with calibration (ionosphere, beam, etc.) and wide-field imaging for the achievement of the deep extragalactic surveys. New types of problems arise in that context, and notions such as algorithmic complexity and parallelism become fundamental.

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Available abstract

LOFAR is a revolutionary instrument, operating at low frequencies ( ν ≲ 240 MHz ). It will drive major breakthroughs in the area of observational cosmology, but its use requires the development of challenging techniques and algorithms. Since its field of view and sensitivity are increased by orders of magnitude as compared to the older generation of instruments, new technical problems have to be addressed. The LOFAR survey team is in charge of commissioning the first LOFAR data produced in the imager mode as part of building the imaging pipeline. We are developing algorithms to tackle the problems associated with calibration (ionosphere, beam, etc.) and wide-field imaging for the achievement of the deep extragalactic surveys. New types of problems arise in that context, and notions such as algorithmic complexity and parallelism become fundamental.

Key concepts: LOFAR, Humanities, Physics, Context (archaeology), Astrophysics, Art, Geography, Archaeology

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