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LOFAR sparse image reconstruction

Garsden, H.; Girard, J. N.; Starck, J. L.; Corbel, S.; Tasse, C.; Woiselle, A.; McKean, J. P.; van Amesfoort, A. S.; Anderson, J.; Avruch, I. M.; Beck, R.; Bentum, M. J.; Best, P.; Breitling, F.; Broderick, J.; Brüggen, M.; Butcher, H. R.; Ciardi, B.; de Gasperin, F.; de Geus, E.; de Vos, Marco; Duscha, S.; Eislöffel, J.; Engels, D.; Falcke, H.; Fallows, R. A.; Fender, R.; Ferrari, C.; Frieswijk, W.; Garrett, M. A.; Griessmeier, J.; Gunst, A. W.; Hassall, T. E.; Heald, G.; Hoeft, M.; Hörandel, J.; van der Horst, A.; Juette, E.; Karastergiou, A.; Kondratiev, V. I.; Kramer, M.; Kuniyoshi, M.; Kuper, G.; Mann, G.; Markoff, S.; McFadden, R.; McKay-Bukowski, D.; Mulcahy, D. D.; Munk, H.; Norden, M. J.; Orru, E.; Paas, H.; Pandey-Pommier, M.; Pandey, V. N.; Pietka, G.; Pizzo, R.; Polatidis, A. G.; Renting, A.; Röttgering, H.; Rowlinson, A.; Schwarz, D.; Sluman, J.; Smirnov, O.; Stappers, B. W.; Steinmetz, M.; Stewart, A.; Swinbank, J.; Tagger, M.; Tang, Y.; Thoudam, S.; Toribio, C.; Vermeulen, R.; Vocks, C.; van Weeren, R. J.; Wijnholds, S. J.; Wise, M. W.; Wucknitz, O.; Yatawatta, S.; Zarka, P.; Zensus, A.

Description

CONTEXT. The LOw Frequency ARray (LOFAR) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components of the sky brightness. Recovering the original brightness distribution with aperture synthesis forms an inverse problem that can be solved by various deconvolution and minimization methods AIMS. Recent papers have established a clear link between the discrete nature of radio interferometry...[Show more]

dc.contributor.authorGarsden, H.
dc.contributor.authorGirard, J. N.
dc.contributor.authorStarck, J. L.
dc.contributor.authorCorbel, S.
dc.contributor.authorTasse, C.
dc.contributor.authorWoiselle, A.
dc.contributor.authorMcKean, J. P.
dc.contributor.authorvan Amesfoort, A. S.
dc.contributor.authorAnderson, J.
dc.contributor.authorAvruch, I. M.
dc.contributor.authorBeck, R.
dc.contributor.authorBentum, M. J.
dc.contributor.authorBest, P.
dc.contributor.authorBreitling, F.
dc.contributor.authorBroderick, J.
dc.contributor.authorBrüggen, M.
dc.contributor.authorButcher, H. R.
dc.contributor.authorCiardi, B.
dc.contributor.authorde Gasperin, F.
dc.contributor.authorde Geus, E.
dc.contributor.authorde Vos, Marco
dc.contributor.authorDuscha, S.
dc.contributor.authorEislöffel, J.
dc.contributor.authorEngels, D.
dc.contributor.authorFalcke, H.
dc.contributor.authorFallows, R. A.
dc.contributor.authorFender, R.
dc.contributor.authorFerrari, C.
dc.contributor.authorFrieswijk, W.
dc.contributor.authorGarrett, M. A.
dc.contributor.authorGriessmeier, J.
dc.contributor.authorGunst, A. W.
dc.contributor.authorHassall, T. E.
dc.contributor.authorHeald, G.
dc.contributor.authorHoeft, M.
dc.contributor.authorHörandel, J.
dc.contributor.authorvan der Horst, A.
dc.contributor.authorJuette, E.
dc.contributor.authorKarastergiou, A.
dc.contributor.authorKondratiev, V. I.
dc.contributor.authorKramer, M.
dc.contributor.authorKuniyoshi, M.
dc.contributor.authorKuper, G.
dc.contributor.authorMann, G.
dc.contributor.authorMarkoff, S.
dc.contributor.authorMcFadden, R.
dc.contributor.authorMcKay-Bukowski, D.
dc.contributor.authorMulcahy, D. D.
dc.contributor.authorMunk, H.
dc.contributor.authorNorden, M. J.
dc.contributor.authorOrru, E.
dc.contributor.authorPaas, H.
dc.contributor.authorPandey-Pommier, M.
dc.contributor.authorPandey, V. N.
dc.contributor.authorPietka, G.
dc.contributor.authorPizzo, R.
dc.contributor.authorPolatidis, A. G.
dc.contributor.authorRenting, A.
dc.contributor.authorRöttgering, H.
dc.contributor.authorRowlinson, A.
dc.contributor.authorSchwarz, D.
dc.contributor.authorSluman, J.
dc.contributor.authorSmirnov, O.
dc.contributor.authorStappers, B. W.
dc.contributor.authorSteinmetz, M.
dc.contributor.authorStewart, A.
dc.contributor.authorSwinbank, J.
dc.contributor.authorTagger, M.
dc.contributor.authorTang, Y.
dc.contributor.authorThoudam, S.
dc.contributor.authorToribio, C.
dc.contributor.authorVermeulen, R.
dc.contributor.authorVocks, C.
dc.contributor.authorvan Weeren, R. J.
dc.contributor.authorWijnholds, S. J.
dc.contributor.authorWise, M. W.
dc.contributor.authorWucknitz, O.
dc.contributor.authorYatawatta, S.
dc.contributor.authorZarka, P.
dc.contributor.authorZensus, A.
dc.date.accessioned2015-04-14T05:44:56Z
dc.date.available2015-04-14T05:44:56Z
dc.identifier.issn0004-6361
dc.identifier.urihttp://hdl.handle.net/1885/13243
dc.description.abstractCONTEXT. The LOw Frequency ARray (LOFAR) radio telescope is a giant digital phased array interferometer with multiple antennas distributed in Europe. It provides discrete sets of Fourier components of the sky brightness. Recovering the original brightness distribution with aperture synthesis forms an inverse problem that can be solved by various deconvolution and minimization methods AIMS. Recent papers have established a clear link between the discrete nature of radio interferometry measurement and the "compressed sensing" (CS) theory, which supports sparse reconstruction methods to form an image from the measured visibilities. Empowered by proximal theory, CS offers a sound framework for efficient global minimization and sparse data representation using fast algorithms. Combined with instrumental direction-dependent effects (DDE) in the scope of a real instrument, we developed and validated a new method based on this framework METHODS. We implemented a sparse reconstruction method in the standard LOFAR imaging tool and compared the photometric and resolution performance of this new imager with that of CLEAN-based methods (CLEAN and MS-CLEAN) with simulated and real LOFAR data Results. We show that i) sparse reconstruction performs as well as CLEAN in recovering the flux of point sources; ii) performs much better on extended objects (the root mean square error is reduced by a factor of up to 10); and iii) provides a solution with an effective angular resolution 2-3 times better than the CLEAN images. CONCLUSIONS. Sparse recovery gives a correct photometry on high dynamic and wide-field images and improved realistic structures of extended sources (of simulated and real LOFAR datasets). This sparse reconstruction method is compatible with modern interferometric imagers that handle DDE corrections (A- and W-projections) required for current and future instruments such as LOFAR and SKA
dc.description.sponsorshipWe acknowledge the financial support from the UnivEarthS Labex program of Sorbonne Paris Cité (ANR-10-LABX-0023 and ANR-11-IDEX-0005-02) and from the European Research Council grant SparseAstro (ERC-228261). LOFAR, the Low Frequency Array designed and constructed by ASTRON, has facilities in several countries, that are owned by various parties (each with their own funding sources), and that are collectively operated by the International LOFAR Telescope (ILT) foundation under a joint scientific policy. C.F. acknowledges financial support by the Agence Nationale de la Recherche through grant ANR-09-JCJC-0001-01.
dc.format18 pages
dc.publisherEDP Sciences
dc.rightshttp://www.sherpa.ac.uk/romeo/issn/0004-6361/..."Pre-print, post-print or publisher version allowed On author's personal website or institutional website or OAI compliant website. Publisher's version/PDF may be used (see journal). On a non-profit server" from SHERPA/RoMEO site (as at 14/04/15)
dc.sourceAstronomy and Astrophysics
dc.titleLOFAR sparse image reconstruction
dc.typeJournal article
local.identifier.citationvolume575
dcterms.dateAccepted2014-12-18
dc.date.issued2015-03
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationa383154xPUB1202
local.publisher.urlhttp://publications.edpsciences.org/
local.type.statusPublished Version
local.contributor.affiliationButcher, H., Research School of Astronomy and Astrophysics, The Australian National University
local.bibliographicCitation.startpageA90
local.identifier.doi10.1051/0004-6361/201424504
local.identifier.absseo970102 - Expanding Knowledge in the Physical Sciences
dc.date.updated2016-06-14T08:28:01Z
local.identifier.scopusID2-s2.0-84924075664
CollectionsANU Research Publications

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