Journal articles
LOFAR sparse image reconstruction
H Garsden
1
J.N Girard
1
J.L. Starck
1
Stéphane Corbel
1
C Tasse
2
A Woiselle
3
J.P. Mckean
4
Alexander S. van Amesfoort
5
J Anderson
4
I. M. Avruch
6
R. Beck
6
M.J. Bentum
5
P. Best
7
F Breitling
8
J. Broderick
9, 10
M. Brüggen
9
Jean-Mathias Grießmeier
11, 12
R Mcfadden
4
D Mckay-Bukowski
13
H Munk
4
E Orru
4
H Paas
14
M Pandey-Pommier
15
Michel Tagger
12
Jean-Mathias Grießmeier 11, 12
Mail :
Author Employer institution : Université d'Orléans
R Mcfadden 4
Author
D Mckay-Bukowski 13
Author
H Munk 4
Author
E Orru 4
Author
H Paas 14
Author
M Pandey-Pommier 15
Author
Michel Tagger 12
Mail :
Author IdHAL : michel-tagger ResearcherId : http://www.researcherid.com/rid/O-6615-2014 IdRef : https://www.idref.fr/097156310 ORCID : https://orcid.org/0000-0003-2962-3220
1
AIM (UMR_7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation (AIM - UMR 7158 - UMR E 9005,
ex "Astrophysique Interactions Multi-échelles",
Service d'astrophysique,
CEA/Saclay,
Orme des Merisiers
F-91191 GIF SUR YVETTE CEDEX - France)
- CEA - Commissariat à l'énergie atomique et aux énergies alternatives : UMR_E_9005 (Centre de Saclay Centre de Grenoble Centre de Cadarache etc - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- UPD7 - Université Paris Diderot - Paris 7 : UMR_7158 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
- CNRS - Centre National de la Recherche Scientifique : UMR_7158 (France)
2
LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique (5, place Jules Janssen 92190 MEUDON - France)
- CNRS - Centre National de la Recherche Scientifique : UMR8109 (France)
- UPD7 - Université Paris Diderot - Paris 7 (5 rue Thomas-Mann - 75205 Paris cedex 13 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - PSL Research University (France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- UPMC - Université Pierre et Marie Curie - Paris 6 (4 place Jussieu - 75005 Paris - France)
3
SAGEM Défense Sécurité [Massy] (100 Avenue de Paris 91300 Massy - France)
4
ASTRON - Netherlands Institute for Radio Astronomy (Oude Hoogeveensedijk 4, 7991 PD Dwingeloo / PO Box 2, 7990 AA Dwingeloo - Netherlands)
5
TU Delft - Delft University of Technology (Postbus 5 2600 AA Delft - Netherlands)
6
SRON - SRON Netherlands Institute for Space Research (SRON Groningen, Landleven 12, 9747 AD Groningen - SRON Utrecht, Sorbonnelaan 2, 3584 CA Utrecht - Netherlands)
7
University of Edinburgh (Old College South Bridge Edinburgh EH8 9YL - United Kingdom)
8
AIP - Leibniz-Institut für Astrophysik Potsdam (An der Sternwarte 16, 14482 Potsdam, Germany - Germany)
9
UHH - Universität Hamburg (Germany)
10
University of Southampton (University Road, Southampton SO17 1BJ - United Kingdom)
11
USN - Unité Scientifique de la Station de Nançay (18330 NANCAY - France)
- UO - Université d'Orléans : USR 704 (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- OSUC - Observatoire des Sciences de l'Univers en région Centre (Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - PSL Research University (France)
- UO - Université d'Orléans (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- CNRS - Centre National de la Recherche Scientifique : UMS3116 (France)
- INSU - CNRS - Institut national des sciences de l'Univers : USR 704 (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris : USR 704 (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - PSL Research University (France)
- CNRS - Centre National de la Recherche Scientifique : USR 704 (France)
12
LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (3A, Avenue de la Recherche Scientifique 45071 Orléans cedex 2 - France)
- OSUC - Observatoire des Sciences de l'Univers en région Centre : UMS3116 (Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - PSL Research University (France)
- UO - Université d'Orléans (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- CNRS - Centre National de la Recherche Scientifique : UMS3116 (France)
- CNES - Centre National d’Études Spatiales [Paris] : UMR 7328 (Siège social : 2 place Maurice Quentin, 75039 Paris - France)
13
University of Oulu (Oulu Finland - Finland)
15
CRAL - Centre de Recherche Astrophysique de Lyon (9 Avenue Charles André 69561 ST GENIS LAVAL CEDEX - France)
- CNRS - Centre National de la Recherche Scientifique : UMR5574 (France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- UCBL - Université Claude Bernard Lyon 1 (43, boulevard du 11 novembre 1918, 69622 Villeurbanne cedex - France)
- Université de Lyon (92 rue Pasteur - CS 30122, 69361 Lyon Cedex 07 - France)
- ENS Lyon - École normale supérieure - Lyon (15 parvis René Descartes - BP 7000 - 69342 Lyon Cedex 07 - France)
Abstract : 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 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.
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Journal articles
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https://hal-insu.archives-ouvertes.fr/insu-01169967
Contributor : Nathalie Pothier <>
Submitted on : Tuesday, June 30, 2015 - 3:39:19 PM
Last modification on : Tuesday, July 21, 2020 - 4:04:48 AM
Document(s) archivé(s) le : Tuesday, April 25, 2017 - 8:27:12 PM
Contributor : Nathalie Pothier <>
Submitted on : Tuesday, June 30, 2015 - 3:39:19 PM
Last modification on : Tuesday, July 21, 2020 - 4:04:48 AM
Document(s) archivé(s) le : Tuesday, April 25, 2017 - 8:27:12 PM
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Identifiers
- HAL Id : insu-01169967, version 1
- DOI : 10.1051/0004-6361/201424504
- ARXIV : 1406.7242
- BIBCODE : 2015A&A...575A..90G
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INSU | LPC2E | OSUC | USN | CNRS | CRAL | ENS-LYON | UNIV-ORLEANS | UNIV-PARIS7 | USPC | OBSPM | UNIV-LYON1 | IRFU-AIM | CEA | DSM-IRFU | CEA-DRF | UDL | UP-SCIENCES | LESIA | SORBONNE-UNIVERSITE | SU-SCIENCES | UPMC
Citation
H Garsden, J.N Girard, J.L. Starck, Stéphane Corbel, C Tasse, et al.. LOFAR sparse image reconstruction. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 575, pp.A90. ⟨10.1051/0004-6361/201424504⟩. ⟨insu-01169967⟩
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