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    Lofar Facet Calibration

    74489.pdf (12.98Mb)
    Access Status
    Open access
    Authors
    Weeren, R.
    Williams, W.
    Hardcastle, M.
    Shimwell, T.
    Rafferty, D.
    Sabater, J.
    Heald, G.
    Sridhar, S.
    Dijkema, T.
    Brunetti, G.
    Brüggen, M.
    Andrade-Santos, F.
    Ogrean, G.
    Röttgering, H.
    Dawson, W.
    Forman, W.
    Gasperin, F.
    Jones, C.
    Miley, G.
    Rudnick, L.
    Sarazin, C.
    Bonafede, A.
    Best, P.
    Birzan, L.
    Cassano, R.
    Chyzy, K.
    Croston, J.
    Ensslin, T.
    Ferrari, C.
    Hoeft, M.
    Horellou, C.
    Jarvis, M.
    Kraft, R.
    Mevius, M.
    Intema, Hubertus
    Murray, S.
    Orrú, E.
    Pizzo, R.
    Simionescu, A.
    Stroe, A.
    Tol, S.
    White, G.
    Date
    2016
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Weeren, R. and Williams, W. and Hardcastle, M. and Shimwell, T. and Rafferty, D. and Sabater, J. and Heald, G. et al. 2016. Lofar Facet Calibration. Astrophysical Journal Supplement Series. 223 (1): Article ID 2.
    Source Title
    Astrophysical Journal Supplement Series
    DOI
    10.3847/0067-0049/223/1/2
    ISSN
    0067-0049
    Remarks

    This is an author-created, un-copy edited version of an article accepted for publication in Astrophysical Journal Supplement Series. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at 10.3847/0067-0049/223/1/2.

    URI
    http://hdl.handle.net/20.500.11937/74204
    Collection
    • Curtin Research Publications
    Abstract

    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 ~5' resolution, meeting the specifications of the LOFAR Tier-1 northern survey.

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