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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Calibrating high-precision Faraday rotation measurements for LOFAR and the next generation of low-frequency radio telescopes
Astronomy and Astrophysics, Volume 552, Article A58, Year 2013
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Description
Faraday rotation measurements using the current and next generation of low-frequency radio telescopes will provide a powerful probe of astronomical magnetic fields. However, achieving the full potential of these measurements requires accurate removal of the time-variable ionospheric Faraday rotation contribution. We present ionFR, a code that calculates the amount of ionospheric Faraday rotation for a specific epoch, geographic location, and line-of-sight. ionFR uses a number of publicly available, GPS-derived total electron content maps and the most recent release of the International Geomagnetic Reference Field. We describe applications of this code for the calibration of radio polarimetric observations, and demonstrate the high accuracy of its modeled ionospheric Faraday rotations using LOFAR pulsar observations. These show that we can accurately determine some of the highest-precision pulsar rotation measures ever achieved. Precision rotation measures can be used to monitor rotation measure variations-either intrinsic or due to the changing line-of-sight through the interstellar medium. This calibration is particularly important for nearby sources, where the ionosphere can contribute a significant fraction of the observed rotation measure. We also discuss planned improvements to ionFR, as well as the importance of ionospheric Faraday rotation calibration for the emerging generation of low-frequency radio telescopes, such as the SKA and its pathfinders. © 2013 ESO.
Authors & Co-Authors
Sotomayor-Beltran, C. A.
Germany, Bochum
Ruhr-universitat Bochum
Sobey, Charlotte A.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Hessels, Jason W.T.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Amsterdam
Universiteit Van Amsterdam
de Bruyn, Ger
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Groningen
Kapteyn Instituut
Noutsos, Aristeidis
Germany, Bonn
Max Planck Institute for Radio Astronomy
Alexov, Anastasia
Netherlands, Amsterdam
Universiteit Van Amsterdam
United States, Baltimore
Space Telescope Science Institute
Anderson, James M.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Asgekar, Ashish
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Avruch, Ian Max
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Utrecht
Sron Netherlands Institute for Space Research
Beck, Rainer
Germany, Bonn
Max Planck Institute for Radio Astronomy
Bell, Martin E.
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
United Kingdom, Southampton
University of Southampton
Bell, Michael R.
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Bentum, Mark J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Bernardi, Gianni
Netherlands, Groningen
Kapteyn Instituut
Best, Phillip N.
United Kingdom, Edinburgh
The University of Edinburgh
Bi̊rzan, Laura
Netherlands, Leiden
Universiteit Leiden
Bonafede, Annalisa
Germany, Hamburg
Universität Hamburg
Germany, Bremen
Constructor University
Breitling, Frank
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Broderick, Jess W.
United Kingdom, Southampton
University of Southampton
Brouw, Willem N.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Groningen
Kapteyn Instituut
Brüggen, Marcus
Germany, Hamburg
Universität Hamburg
Ciardi, Benedetta
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
De Gasperin, Francesco
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Germany, Hamburg
Universität Hamburg
Dettmar, Ralf Juergen
Germany, Bochum
Ruhr-universitat Bochum
van Duin, Albert P.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Duscha, Sven
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Eislöffel, Jochen
Germany, Camburg
Thüringer Landessternwarte
Falcke, Heino D.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Nijmegen
Radboud Universiteit
Fallows, Richard A.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Fender, Robert P.
United Kingdom, Southampton
University of Southampton
Ferrari, Chiara
France, Nice
Université Côte D'azur
Frieswijk, Wilfred W.F.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Garrett, Michael A.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Leiden
Universiteit Leiden
Grießmeier, Jean Mathias
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
France, Orleans
Laboratoire de Physique et de Chimie de L'environnement et de L'espace Lpc2e
Grit, Teun
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Gunst, André W.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Hassall, Tom E.
United Kingdom, Southampton
University of Southampton
United Kingdom, Manchester
The University of Manchester
Heald, George H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Hoeft, Matthias
Germany, Camburg
Thüringer Landessternwarte
Horneffer, Andreas
Germany, Bonn
Max Planck Institute for Radio Astronomy
Iacobelli, Marco
Netherlands, Leiden
Universiteit Leiden
Juette, E.
Germany, Bochum
Ruhr-universitat Bochum
Karastergiou, Aris
United Kingdom, Oxford
University of Oxford
Keane, Evan F.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Köhler, Jess
Germany, Bonn
Max Planck Institute for Radio Astronomy
Kramer, Michael
Germany, Bonn
Max Planck Institute for Radio Astronomy
United Kingdom, Manchester
The University of Manchester
Kondratiev, Vladislav I.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Russian Federation, Moscow
P.n. Lebedev Physical Institute of the Russian Academy of Sciences
Koopmans, Léon V.E.
Netherlands, Groningen
Kapteyn Instituut
Kuniyoshi, Masaya
Germany, Bonn
Max Planck Institute for Radio Astronomy
Kuper, G.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
van Leeuwen, Joeri
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Amsterdam
Universiteit Van Amsterdam
Maat, Peter D.H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
MacArio, Giulia
France, Nice
Université Côte D'azur
Markoff, Sera B.
Netherlands, Amsterdam
Universiteit Van Amsterdam
McKean, John P.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Mulcahy, D. D.
Germany, Bonn
Max Planck Institute for Radio Astronomy
Munk, H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Orrú, Emanuela
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Nijmegen
Radboud Universiteit
Paas, Harm
Netherlands, Groningen
Rijksuniversiteit Groningen
Pandey-Pommier, Mamta
Netherlands, Leiden
Universiteit Leiden
France, Saint-genis-laval
Observatoire de Lyon
Pilia, Maura
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Pizzo, Roberto F.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Polatidis, Antonios G.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Reich, Wolfganga
Germany, Bonn
Max Planck Institute for Radio Astronomy
R̈ottgering, Huub J.A.R.
Netherlands, Leiden
Universiteit Leiden
Serylak, MacIej
France, Orleans
Laboratoire de Physique et de Chimie de L'environnement et de L'espace Lpc2e
France, Nancay
Station de Radioastronomie de Nancay
Sluman, J. J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Stappers, Benjamin W.
United Kingdom, Manchester
The University of Manchester
Tagger, Michel
France, Orleans
Laboratoire de Physique et de Chimie de L'environnement et de L'espace Lpc2e
Tang, Y.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Tasse, Cyril
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Ter-Veen, Sander
Netherlands, Nijmegen
Radboud Universiteit
Vermeulen, René C.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
van Weeren, Reinout J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Leiden
Universiteit Leiden
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Wijers, Ralph A.M.J.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Wijnholds, Stefan J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Wise, Michael W.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Amsterdam
Universiteit Van Amsterdam
Wucknitz, Olaf
Germany, Bonn
Max Planck Institute for Radio Astronomy
Germany, Bonn
Universität Bonn
Yatawatta, Sarod B.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Zarka, Philippe M.
France, Meudon
Lesia - Laboratoire D'etudes Spatiales et D'instrumentation en Astrophysique
Statistics
Citations: 100
Authors: 80
Affiliations: 28
Identifiers
Doi:
10.1051/0004-6361/201220728
ISSN:
00046361