LOFAR calibration and wide-field imaging

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• 作者：Cyril Tasse^a ; ^{cyril.tasse@obspm.fr} ; Ger van Diepen^b ; Sebastiaan van der Tol^c ; Reinout J. van Weeren^c ; Joris E. van Zwieten^c ; Fabien Batejat^d ; Sanjay Bhatnagar^e ; Ilse van Bemmel^b ; Laura Bî ; rzan^c ; Annalisa Bonafede^f ; John Conway^d ; Chiara Ferrari^g ; Francesco De Gasperin^h ; Kumar Golap^e ; George Heald^b ; Neal Jacksonⁱ ; Giulia Macario^g ; John McKean^b ; Niruj Mohan^c ; Emanuela Orrù ; ^j ; Roberto Pizzo^b ; David Rafferty^c ; Urvashi Rau^e ; Huub Rö ; ttgering^c ; Aleksandar Shulevski^j ; on behalf of the LOFAR Collaboration
• 关键词：LOFAR ; Interferometry ; Calibration ; Imaging
• 刊名：Comptes Rendus Physique
• 出版年：2012
• 出版时间：January-February 2012
• 年：2012
• 卷：13
• 期：1
• 页码：28-32
• 全文大小：219 K

文摘

LOFAR is a revolutionary instrument, operating at low frequencies (). 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.