Search: onr:"swepub:oai:research.chalmers.se:b27775cb-9623-4d2e-a4be-667147e71dd0" >
Cassiopeia A, Cygnu...
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De Gasperin, F.Universität Hamburg,University of Hamburg
(author)
Cassiopeia A, Cygnus A, Taurus A, and Virgo A at ultra-low radio frequencies
- Article/chapterEnglish2020
Publisher, publication year, extent ...
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2020-03-26
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EDP Sciences,2020
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electronicrdacarrier
Numbers
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LIBRIS-ID:oai:research.chalmers.se:b27775cb-9623-4d2e-a4be-667147e71dd0
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https://research.chalmers.se/publication/516438URI
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https://doi.org/10.1051/0004-6361/201936844DOI
Supplementary language notes
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Language:English
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Summary in:English
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Classification
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Subject category:art swepub-publicationtype
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Subject category:ref swepub-contenttype
Notes
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The four persistent radio sources in the northern sky with the highest flux density at metre wavelengths are Cassiopeia A, Cygnus A, Taurus A, and Virgo A; collectively they are called the A-team. Their flux densities at ultra-low frequencies (< 100 MHz) can reach several thousands of janskys, and they often contaminate observations of the low-frequency sky by interfering with image processing. Furthermore, these sources are foreground objects for all-sky observations hampering the study of faint signals, such as the cosmological 21 cm line from the epoch of reionisation. Aims. We aim to produce robust models for the surface brightness emission as a function of frequency for the A-team sources at ultra-low frequencies. These models are needed for the calibration and imaging of wide-area surveys of the sky with low-frequency interferometers. This requires obtaining images at an angular resolution better than 15″ with a high dynamic range and good image fidelity. Methods. We observed the A-team with the Low Frequency Array (LOFAR) at frequencies between 30 MHz and 77 MHz using the Low Band Antenna system. We reduced the datasets and obtained an image for each A-team source. Results. The paper presents the best models to date for the sources Cassiopeia A, Cygnus A, Taurus A, and Virgo A between 30 MHz and 77 MHz. We were able to obtain the aimed resolution and dynamic range in all cases. Owing to its compactness and complexity, observations with the long baselines of the International LOFAR Telescope will be required to improve the source model for Cygnus A further.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
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Vink, J.Universiteit Van Amsterdam,University of Amsterdam,Netherlands Institute for Space Research (SRON)
(author)
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McKean, J.Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Asgekar, A.Shell Technology Center,Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Avruch, I.M.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Bentum, M. J.Technische Universiteit Eindhoven,Eindhoven University of Technology,Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Blaauw, R.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Bonafede, A.Istituto di Radioastronomia,Universita di Bologna,University of Bologna,Universität Hamburg,University of Hamburg
(author)
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Broderick, J.W.Curtin University
(author)
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Brueggen, M.Universität Hamburg,University of Hamburg
(author)
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Breitling, F.Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam
(author)
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Brouw, W. N.Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Butcher, H. R.Australian National University
(author)
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Ciardi, B.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Cuciti, V.Universität Hamburg,University of Hamburg
(author)
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De Vos, M.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Duscha, S.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Eisloffel, J.Thüringer Landessternwarte Tautenburg
(author)
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Engels, D.Universität Hamburg,University of Hamburg
(author)
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Fallows, R. A.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Franzen, T. M.O.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Garrett, M. A.University of Manchester,Universiteit Leiden (UL),Leiden University (UL)
(author)
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Gunst, A.W.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Hörandel, J.R.Vrije Universiteit Brüssel (VUB),Vrije Universiteit Brussel (VUB),Radboud Universiteit,Radboud University,National Institute for Subatomic Physics (NIKHEF)
(author)
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Heald, G.Commonwealth Scientific and Industrial Research Organisation (CSIRO)
(author)
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Hoeft, M.Thüringer Landessternwarte Tautenburg
(author)
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Iacobelli, M.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Koopmans, L.V.E.Rijksuniversiteit Groningen,University of Groningen
(author)
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Krankowski, A.University of Warmia and Mazury in Olsztyn
(author)
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Maat, P.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Mann, G.Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam
(author)
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Mevius, M.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Miley, G.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Morganti, R.Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen
(author)
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Nelles, A.Deutsches Elektronen-Synchrotron (DESY),Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)
(author)
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Norden, M. J.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Offringa, A. R.Rijksuniversiteit Groningen,University of Groningen,Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Orrú, E.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Paas, H.Rijksuniversiteit Groningen,University of Groningen
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Pandey, V. N.Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen
(author)
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Pandey-Pommier, M.Station de Radioastronomie de Nançay,CRAL Le Centre de Recherche Astronomique de Lyon
(author)
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Pekal, R.
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Pizzo, R.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Reich, W.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Rowlinson, A.Universiteit Van Amsterdam,University of Amsterdam,Netherlands Institute for Radio Astronomy (ASTRON)
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Rottgering, H.Universiteit Leiden (UL),Leiden University (UL)
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Schwarz, D. J.Universität Bielefeld,Bielefeld University
(author)
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Shulevski, A.Universiteit Van Amsterdam,University of Amsterdam
(author)
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Smirnov, O.Rhodes University
(author)
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Sobey, C.Commonwealth Scientific and Industrial Research Organisation (CSIRO)
(author)
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Soida, M.Jagiellonian University in Kraków, Poland
(author)
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Steinmetz, M.Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam
(author)
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Tagger, M.Universite d'Orleans,University of Orléans
(author)
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Toribio, M. C.
(author)
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van Ardenne, Arnold,1948Netherlands Institute for Radio Astronomy (ASTRON)(Swepub:cth)ardenne
(author)
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van der Horst, A. J.George Washington University
(author)
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van Haarlem, M. P.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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van Weeren, R.Universiteit Leiden (UL),Leiden University (UL)
(author)
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Vocks, C.Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam
(author)
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Wucknitz, O.Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
(author)
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Zarka, P.M.PSL University Paris
(author)
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Zucca, P.Netherlands Institute for Radio Astronomy (ASTRON)
(author)
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Universität HamburgUniversiteit Van Amsterdam
(creator_code:org_t)
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In:Astronomy and Astrophysics: EDP Sciences6350004-63611432-0746
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De Gasperin, F.
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Vink, J.
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McKean, J.
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Asgekar, A.
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Avruch, I.M.
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Bentum, M. J.
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show more...
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Blaauw, R.
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Bonafede, A.
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Broderick, J.W.
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Brueggen, M.
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Breitling, F.
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Brouw, W. N.
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Butcher, H. R.
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Ciardi, B.
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Cuciti, V.
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De Vos, M.
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Duscha, S.
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Eisloffel, J.
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Engels, D.
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Fallows, R. A.
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Franzen, T. M.O.
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Garrett, M. A.
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Gunst, A.W.
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Hörandel, J.R.
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Heald, G.
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Hoeft, M.
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Iacobelli, M.
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Koopmans, L.V.E.
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Krankowski, A.
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Maat, P.
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Mann, G.
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Mevius, M.
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Miley, G.
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Morganti, R.
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Nelles, A.
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Norden, M. J.
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Offringa, A. R.
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Orrú, E.
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Paas, H.
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Pandey, V. N.
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Pandey-Pommier, ...
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Pekal, R.
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Pizzo, R.
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Reich, W.
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Rowlinson, A.
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Rottgering, H.
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Schwarz, D. J.
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Shulevski, A.
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Smirnov, O.
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Sobey, C.
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Soida, M.
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Steinmetz, M.
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Tagger, M.
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Toribio, M. C.
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van Ardenne, Arn ...
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van der Horst, A ...
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van Haarlem, M. ...
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van Weeren, R.
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Vocks, C.
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Wucknitz, O.
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Zarka, P.M.
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Zucca, P.
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