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LOFAR Facet Calibra...
LOFAR Facet Calibration
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- van Weeren, R. J. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Williams, W. L. (author)
- University of Hertfordshire,Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL)
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- Hardcastle, M. J. (author)
- University of Hertfordshire
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- Shimwell, T. W. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Rafferty, D. (author)
- Universität Hamburg,University of Hamburg
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- Sabater, J. (author)
- University of Edinburgh
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- Heald, G. (author)
- Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen
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- Sridhar, S. S. (author)
- Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON)
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- Dijkema, T. J. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Brunetti, G. (author)
- Istituto di Radioastronomia
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- Brüggen, M. (author)
- Universität Hamburg,University of Hamburg
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- Andrade-Santos, F. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Ogrean, G. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Rottgering, H. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Dawson, W. A. (author)
- Lawrence Livermore National Laboratory
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- Forman, W. R. (author)
- Harvard-Smithsonian Center for Astrophysics
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- De Gasperin, F. (author)
- Universiteit Leiden (UL),Leiden University (UL),Universität Hamburg,University of Hamburg
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- Jones, C. G. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Miley, G. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- Rudnick, L. (author)
- University of Minnesota
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- Sarazin, C. L. (author)
- University of Virginia
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- Bonafede, A. (author)
- Universität Hamburg,University of Hamburg
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- Best, P. N. (author)
- University of Edinburgh
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- Birzan, L. (author)
- Universität Hamburg,University of Hamburg
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- Cassano, R. (author)
- Istituto di Radioastronomia
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- Chyz̊y, K.T. (author)
- Jagiellonian University in Kraków, Poland
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- Croston, J. H. (author)
- University of Southampton
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- Enßlin, T.A. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Ferrari, C. (author)
- Observatoire de la Cote d'Azur
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- Hoeft, M. (author)
- Thüringer Landessternwarte Tautenburg
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- Horellou, Cathy, 1967 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Jarvis, M. J. (author)
- University of the Western Cape,University Of Oxford
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- Kraft, R. P. (author)
- Harvard-Smithsonian Center for Astrophysics
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- Mevius, M. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Intema, H. T. (author)
- Universiteit Leiden (UL),Leiden University (UL),National Radio Astronomy Observatory
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- Murray, S. S. (author)
- Johns Hopkins University,Harvard-Smithsonian Center for Astrophysics
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- Orru, E. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- Pizzo, R. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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Simionescu, A. (author)
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- Stroe, A. (author)
- Universiteit Leiden (UL),Leiden University (UL)
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- van der Tol, S. (author)
- Netherlands Institute for Radio Astronomy (ASTRON)
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- White, G. J. (author)
- Open University,STFC Rutherford Appleton Laboratory
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(creator_code:org_t)
- 2016-03-07
- 2016
- English.
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In: Astrophysical Journal, Supplement Series. - : American Astronomical Society. - 1538-4365 .- 0067-0049. ; 223:1
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Abstract
Subject headings
Close
- LOFAR, the Low-Frequency Array, is a powerful new radio telescope operating between 10 and 240 MHz. LOFAR allows detailed sensitive high-resolution studies of the low-frequency radio sky. At the same time LOFAR also provides excellent short baseline coverage to map diffuse extended emission. However, producing highquality deep images is challenging due to the presence of direction-dependent calibration errors, caused by imperfect knowledge of the station beam shapes and the ionosphere. Furthermore, the large data volume and presence of station clock errors present additional difficulties. In this paper we present a new calibration scheme, which we name facet calibration, to obtain deep high-resolution LOFAR High Band Antenna images using the Dutch part of the array. This scheme solves and corrects the direction-dependent errors in a number of facets that cover the observed field of view. Facet calibration provides close to thermal noise limited images for a typical 8 hr observing run at similar to 5. resolution, meeting the specifications of the LOFAR Tier-1 northern survey.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- algorithm
- wide-field
- gain calibration
- system
- techniques: interferometric
- self-calibration
- w-projection
- radio interferometric calibration
- astronomy
- sky survey
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
To the university's database
- By the author/editor
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van Weeren, R. J ...
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Williams, W. L.
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Hardcastle, M. J ...
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Shimwell, T. W.
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Rafferty, D.
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Sabater, J.
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show more...
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Heald, G.
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Sridhar, S. S.
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Dijkema, T. J.
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Brunetti, G.
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Brüggen, M.
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Andrade-Santos, ...
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Ogrean, G.
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Rottgering, H.
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Dawson, W. A.
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Forman, W. R.
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De Gasperin, F.
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Jones, C. G.
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Miley, G.
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Rudnick, L.
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Sarazin, C. L.
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Bonafede, A.
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Best, P. N.
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Birzan, L.
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Cassano, R.
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Chyz̊y, K.T.
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Croston, J. H.
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Enßlin, T.A.
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Ferrari, C.
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Hoeft, M.
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Horellou, Cathy, ...
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Jarvis, M. J.
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Kraft, R. P.
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Mevius, M.
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Intema, H. T.
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Murray, S. S.
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Orru, E.
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Pizzo, R.
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Simionescu, A.
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Stroe, A.
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van der Tol, S.
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White, G. J.
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- About the subject
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- NATURAL SCIENCES
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NATURAL SCIENCES
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and Physical Science ...
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and Astronomy Astrop ...
- Articles in the publication
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Astrophysical Jo ...
- By the university
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Chalmers University of Technology