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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Initial LOFAR observations of epoch of reionization windows: II. diffuse polarized emission in the ELAIS-N1 field
Astronomy and Astrophysics, Volume 568, Article A101, Year 2014
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Description
Aims. This study aims to characterise the polarized foreground emission in the ELAIS-N1 field and to address its possible implications for extracting of the cosmological 21 cm signal from the LOw-Frequency ARray-Epoch of Reionization (LOFAR-EoR) data. Methods. We used the high band antennas of LOFAR to image this region and RM-synthesis to unravel structures of polarized emission at high Galactic latitudes. Results. The brightness temperature of the detected Galactic emission is on average ~4 K in polarized intensity and covers the range from-10 to + 13 rad m-2 in Faraday depth. The total polarized intensity and polarization angle show a wide range of morphological features. We have also used the Westerbork Synthesis Radio Telescope (WSRT) at 350 MHz to image the same region. The LOFAR and WSRT images show a similar complex morphology at comparable brightness levels, but their spatial correlation is very low. The fractional polarization at 150 MHz, expressed as a percentage of the total intensity, amounts to 1.5%. There is no indication of diffuse emission in total intensity in the interferometric data, in line with results at higher frequencies Conclusions. The wide frequency range, high angular resolution, and high sensitivity make LOFAR an exquisite instrument for studying Galactic polarized emission at a resolution of ~1-2 rad m-2 in Faraday depth. The different polarized patterns observed at 150 MHz and 350 MHz are consistent with different source distributions along the line of sight wring in a variety of Faraday thin regions of emission. The presence of polarized foregrounds is a serious complication for epoch of reionization experiments. To avoid the leakage of polarized emission into total intensity, which can depend on frequency, we need to calibrate the instrumental polarization across the field of view to a small fraction of 1%. © 2014 ESO.
Authors & Co-Authors
Jelić, Vibor
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
de Bruyn, A. Ger
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Mevius, M.
Netherlands, Groningen
Kapteyn Instituut
Abdalla, Fillipe Batoni
United Kingdom, London
University College London
Asad, K. M.B.
Netherlands, Groningen
Kapteyn Instituut
Bernardi, Gianni
South Africa, Pinelands
Square Kilometre Array, South Africa
Brentjens, Michiel A.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Bus, Sander
Netherlands, Groningen
Kapteyn Instituut
Chapman, Emma
United Kingdom, London
University College London
Ciardi, Benedetta
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Daiboo, Soobash
Netherlands, Groningen
Kapteyn Instituut
Fernandez, Elizabeth R.
Netherlands, Groningen
Kapteyn Instituut
Ghosh, Abhik
Netherlands, Groningen
Kapteyn Instituut
Harker, Geraint J.A.
United States, Boulder
University of Colorado Boulder
Jensen, Hannes
Sweden, Stockholm
Oskar Klein Centre
Kazemi, Sanaz
Netherlands, Groningen
Kapteyn Instituut
Koopmans, Léon V.E.
Netherlands, Groningen
Kapteyn Instituut
Labropoulos, Panagiotis
Netherlands, Groningen
Kapteyn Instituut
Martinez-Rubi, O.
Netherlands, Groningen
Kapteyn Instituut
Mellema, Garrelt
Sweden, Stockholm
Oskar Klein Centre
Offringa, André R.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Australia, Sydney
Arc Centre of Excellence for All-sky Astrophysics
Pandey, Vishhambhar N.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Patil, Ajinkya H.
Netherlands, Groningen
Kapteyn Instituut
Thomas, Rajat Mani
Netherlands, Groningen
Kapteyn Instituut
Vedantham, Harish K.
Netherlands, Groningen
Kapteyn Instituut
Veligatla, Vamsikrishna
Netherlands, Groningen
Kapteyn Instituut
Yatawatta, Sarod B.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Zaroubi, Saleem
Netherlands, Groningen
Kapteyn Instituut
Alexov, Anastasia
United States, Baltimore
Space Telescope Science Institute
Anderson, James M.
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Avruch, Ian Max
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
Bentum, Mark J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Best, Phillip N.
United Kingdom, Edinburgh
University of Edinburgh, Institute for Astronomy
Bonafede, Annalisa
Germany, Hamburg
Universität Hamburg
Bregman, Jaap D.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Breitling, Frank
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Broderick, Jess W.
United Kingdom, Southampton
University of Southampton
Brouw, Willem N.
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Brüggen, Marcus
Germany, Hamburg
Universität Hamburg
Butcher, Harvey R.
Australia, Canberra
Australian National University, Mount Stromlo Observatory
Conway, John E.
Sweden, Onsala
Onsala Space Observatory
De Gasperin, Francesco
Germany, Hamburg
Universität Hamburg
de Geus, Eugène J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Deller, Adam T.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Dettmar, Ralf Juergen
Germany, Bochum
Ruhr-universitat Bochum
Duscha, Sven
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Eislöffel, Jochen
Unknown Affiliation
Engels, Dieter
Germany, Hamburg
Universität Hamburg
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, Oxford
University of Oxford
Ferrari, Chiara
France, Nice
Laboratoire Joseph-louis Lagrange
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
Sterrewacht Leiden
Grießmeier, Jean Mathias
France, Orleans
Université D'orléans
France, Nancay
Station de Radioastronomie de Nancay
Gunst, André W.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Hamaker, Johan P.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Hassall, Tom E.
United Kingdom, Southampton
University of Southampton
United Kingdom, Manchester
The University of Manchester
Haverkorn, Marijke
Netherlands, Nijmegen
Radboud Universiteit
Netherlands, Leiden
Sterrewacht Leiden
Heald, George H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Hessels, Jason W.T.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Netherlands, Amsterdam
Anton Pannekoek Instituut Voor Sterrenkunde
Hoeft, Matthias
Unknown Affiliation
Hörandel, Jörg R.
Netherlands, Nijmegen
Radboud Universiteit
Horneffer, Andreas
Germany, Bonn
Max Planck Institute for Radio Astronomy
van der Horst, Alexander J.
Netherlands, Amsterdam
Anton Pannekoek Instituut Voor Sterrenkunde
Iacobelli, Marco
Netherlands, Leiden
Sterrewacht Leiden
Juette, E.
Germany, Bochum
Ruhr-universitat Bochum
Karastergiou, Aris
United Kingdom, Oxford
University of Oxford
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
Kramer, Michael
Germany, Bonn
Max Planck Institute for Radio Astronomy
United Kingdom, Manchester
The University of Manchester
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
Anton Pannekoek Instituut Voor Sterrenkunde
Maat, Peter D.H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Mann, Gottfried J.
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
McKay-Bukowski, Derek J.
Finland, Sodankyla
Sodankylä Geophysical Observatory
United Kingdom, Didcot
Rutherford Appleton Laboratory
McKean, John P.
Netherlands, Groningen
Kapteyn Instituut
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Munk, H.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Nelles, Anna
Netherlands, Nijmegen
Radboud Universiteit
Norden, Menno J.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Paas, Harm
Netherlands, Groningen
Rijksuniversiteit Groningen
Pandey-Pommier, Mamta
France, Saint-genis-laval
Centre de Recherche Astrophysique de Lyon
Pietka, G.
United Kingdom, Oxford
University of Oxford
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
Sterrewacht Leiden
Rowlinson, Antonia
Netherlands, Amsterdam
Anton Pannekoek Instituut Voor Sterrenkunde
Scaife, Anna M.M.
United Kingdom, Southampton
University of Southampton
Schwarz, Dominik J.
Germany, Bielefeld
Universität Bielefeld
Serylak, MacIej
United Kingdom, Oxford
University of Oxford
Smirnov, Oleg M.
South Africa, Pinelands
Square Kilometre Array, South Africa
South Africa, Grahamstown
Rhodes University
Steinmetz, Matthias
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Stewart, Adam J.
United Kingdom, Oxford
University of Oxford
Tagger, Michel
France, Orleans
Université D'orléans
Tang, Y.
Netherlands, Dwingeloo
Netherlands Foundation for Research in Astronomy
Tasse, Cyril
France, Paris
L'observatoire de Paris
Ter-Veen, Sander
Netherlands, Nijmegen
Radboud Universiteit
Statistics
Citations: 100
Authors: 100
Affiliations: 34
Identifiers
Doi:
10.1051/0004-6361/201423998
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Environmental