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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 16506naa a2201501 4500 | |
| 001 | oai:DiVA.org:lnu-47974 | |
| 003 | SwePub | |
| 008 | 151207s2015 | |||||||||||000 ||eng| | |
| 009 | oai:research.chalmers.se:401bcadf-4a20-43b6-99f6-2abd77b8266a | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-479742 URI |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2014250422 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/2146042 URI |
| 040 | a (SwePub)lnud (SwePub)cth | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Moldón, J.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; University of Twente, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Twente,University of Twente4 aut |
| 245 | 1 0 | a The LOFAR long baseline snapshot calibrator survey |
| 264 | c 2015-01-28 | |
| 264 | 1 | b EDP Sciences,c 2015 |
| 338 | a print2 rdacarrier | |
| 520 | a Aims. An efficient means of locating calibrator sources for international LOw Frequency ARray (LOFAR) is developed and used to determine the average density of usable calibrator sources on the sky for subarcsecond observations at 140 MHz.Methods. We used the multi-beaming capability of LOFAR to conduct a fast and computationally inexpensive survey with the full international LOFAR array. Sources were preselected on the basis of 325 MHz arcminute-scale flux density using existing catalogues. By observing 30 different sources in each of the 12 sets of pointings per hour, we were able to inspect 630 sources in two hours to determine if they possess a sufficiently bright compact component to be usable as LOFAR delay calibrators.Results. More than 40% of the observed sources are detected on multiple baselines between international stations and 86 are classified as satisfactory calibrators. We show that a flat low-frequency spectrum (from 74 to 325 MHz) is the best predictor of compactness at 140 MHz. We extrapolate from our sample to show that the sky density of calibrators that are sufficiently bright to calibrate dispersive and non-dispersive delays for the international LOFAR using existing methods is 1.0 per square degree.Conclusions. The observed density of satisfactory delay calibrator sources means that observations with international LOFAR should be possible at virtually any point in the sky provided that a fast and efficient search, using the methodology described here, is conducted prior to the observation to identify the best calibrator. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng |
| 653 | a instrumentation | |
| 653 | a high angular resolution | |
| 653 | a interferometers | |
| 653 | a methods | |
| 653 | a observational | |
| 653 | a techniques | |
| 653 | a interferometric | |
| 653 | a high angular resolution | |
| 653 | a catalogs | |
| 653 | a Astroparticle Physics | |
| 653 | a Astropartikelfysik | |
| 700 | 1 | a Deller, A. T.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; ShellTechnology Center, India,Netherlands Institute for Radio Astronomy (ASTRON),Shell Technology Center4 aut |
| 700 | 1 | a Wucknitz, O.u Max-Planck-Institut für Radioastronomie, Germany,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Jackson, N.u The University of Manchester, UK,University of Manchester4 aut |
| 700 | 1 | a Drabent, A.u Thüringer Landessternwarte, Germany,Thüringer Landessternwarte Tautenburg,Curtin University,ARC Centre of Excellence for All-sky Astrophysics (CAASTRO),University of Portsmouth,University of Portsmouth, UK ; University of Sydney, Australia ;4 aut |
| 700 | 1 | a Carozzi, Tobia,d 1966u Chalmers University of Technology,Chalmers tekniska högskola4 aut0 (Swepub:cth)tobia |
| 700 | 1 | a Conway, John,d 1963u Chalmers University of Technology,Chalmers tekniska högskola4 aut0 (Swepub:cth)jconway |
| 700 | 1 | a Kapinska, A. D.u University of Portsmouth, UK ; University of Sydney, Australia ;4 aut |
| 700 | 1 | a McKean, J. P.u ASTRON, the Netherlands Institute for Radio Astronomy, Nehterlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Morabito, L.u Leiden University, The Netherlands,Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Varenius, Eskil,d 1986u Chalmers University of Technology,Chalmers tekniska högskola4 aut0 (Swepub:cth)varenius |
| 700 | 1 | a Zarka, P.u Univ. Paris-Diderot, France,Centre national de la recherche scientifique (CNRS)4 aut |
| 700 | 1 | a Anderson, J.u DeutschesGeoForschungsZentrum GFZ, Germany,Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ)4 aut |
| 700 | 1 | a Asgekar, A.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; ShellTechnology Center, India,Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL),University Of Oxford,Australian National University,Commonwealth Scientific and Industrial Research Organisation (CSIRO),University of Southampton,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; Leiden University, The Netherlands,University of Oxford, UK,Australian National University, Australia,CSIRO Australia Telescope National Facility, Australia,Max-Planck-Institut für Radioastronomie, Germany4 aut |
| 700 | 1 | a Avruch, I. M.u SRON Netherlands Insitute for Space Research, The Netherlands,Netherlands Institute for Space Research (SRON)4 aut |
| 700 | 1 | a Bell, M. E.u CSIRO Australia Telescope National Facility, Australia,Commonwealth Scientific and Industrial Research Organisation (CSIRO)4 aut |
| 700 | 1 | a Bentum, M. J.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; University of Twente, The Netherlands,Ruhr-Universität Bochum4 aut |
| 700 | 1 | a Bernardi, G.u Harvard-Smithsonian Center for Astrophysics, USA4 aut |
| 700 | 1 | a Best, P.u University of Edinburgh, UK4 aut |
| 700 | 1 | a Bîrzan, L.u Leiden University, The Netherlands,Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Bregman, J.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Breitling, F.u Leibniz-Institut für Astrophysik Potsdam, Germany,Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Broderick, J. W.u University of Oxford, UK ; University of Southampton UK,University of Southampton,University Of Oxford4 aut |
| 700 | 1 | a Brüggen, M.u University of Hamburg, Germany,Universität Hamburg4 aut |
| 700 | 1 | a Butcher, H. R.u Australian National University, Australia,Universiteit Leiden (UL),Leiden University (UL),Leiden University, The Netherlands4 aut |
| 700 | 1 | a Carbone, D.u University of Amsterdam, The Netherlands,Universiteit Van Amsterdam4 aut |
| 700 | 1 | a Ciardi, B.u Max Planck Institute for Astrophysics, Germany4 aut |
| 700 | 1 | a de Gasperin, F.u University of Hamburg, Germany,Universität Hamburg4 aut |
| 700 | 1 | a de Geus, E.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; SmarterVision BV, The Netherland,Netherlands Institute for Radio Astronomy (ASTRON),Universität Hamburg,University of Hamburg,Hamburger Sternwarte, Germany4 aut |
| 700 | 1 | a Duscha, S.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Universität Bielefeld,Bielefeld University,Universität Bielefeld, Germany4 aut |
| 700 | 1 | a Eislöffel, J.u Thüringer Landessternwarte, Germany,Thüringer Landessternwarte Tautenburg,Astronomisches Institut der Ruhr-Universität Bochum, Germany4 aut |
| 700 | 1 | a Engels, D.u Hamburger Sternwarte, Germany4 aut |
| 700 | 1 | a Falcke, H.u Radboud University Nijmegen, The Netherlands ; ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Radboud Universiteit,Radboud University4 aut |
| 700 | 1 | a Fallows, R. A.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands4 aut |
| 700 | 1 | a Fender, R.u University of Oxford, UK,University Of Oxford4 aut |
| 700 | 1 | a Ferrari, C.u Université de Nice Sophia-Antipolis, France,Centre national de la recherche scientifique (CNRS)4 aut |
| 700 | 1 | a Frieswijk, W.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Garrett, M. A.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; Leiden University, The Netherlands,Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam,Leibniz-Institut für Astrophysik Potsdam (AIP), Germany4 aut |
| 700 | 1 | a Grießmeier, J.u LPC2E – Université d’Orléans/CNRS, France ; Univ. Orléans, France,Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Gunst, A. W.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands4 aut |
| 700 | 1 | a Hamaker, J. P.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen,University of Groningen, The Netherlands4 aut |
| 700 | 1 | a Hassall, T. E.u University of Southampton, UK4 aut |
| 700 | 1 | a Heald, G.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Hoeft, M.u Thüringer Landessternwarte, Germany,Thüringer Landessternwarte Tautenburg,Netherlands Institute for Radio Astronomy (ASTRON),ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands4 aut |
| 700 | 1 | a Juette, E.u Astronomisches Institut der Ruhr-Universität Bochum, Germany4 aut |
| 700 | 1 | a Karastergiou, A.u University of Oxford, UK4 aut |
| 700 | 1 | a Kondratiev, V. I.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Astro Space Center of Lebedev Physical Institute4 aut |
| 700 | 1 | a Kramer, M.u Max-Planck-Institut für Radioastronomie, Germany ; The University of Manchester, UK,University of Manchester,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Kuniyoshi, M.u Max-Planck-Institut für Radioastronomie, Germany,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy4 aut |
| 700 | 1 | a Kuper, G.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Maat, P.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Observatoire de Lyon,Lyon Observatory,Observatoire de Lyon, France4 aut |
| 700 | 1 | a Mann, G.u Leibniz-Institut für Astrophysik Potsdam (AIP), Germany4 aut |
| 700 | 1 | a Markoff, S.u University of Amsterdam, The Netherlands,Universiteit Van Amsterdam,Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam,Leibniz-Institut für Astrophysik Potsdam (AIP), Germany4 aut |
| 700 | 1 | a McFadden, R.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a McKay-Bukowski, D.u University of Oulu, Finland ; STFC Rutherford Appleton Laboratory, UK,Oulun Yliopisto,STFC Rutherford Appleton Laboratory4 aut |
| 700 | 1 | a Morganti, R.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; Kapteyn Astronomical Institute, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Munk, H.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands4 aut |
| 700 | 1 | a Norden, M. J.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands4 aut |
| 700 | 1 | a Offringa, A. R.u Australian National University, Australia4 aut |
| 700 | 1 | a Orru, E.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Paas, H.u University of Groningen, The Netherlands4 aut |
| 700 | 1 | a Pandey-Pommier, M.u Observatoire de Lyon, France4 aut |
| 700 | 1 | a Pizzo, R.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Polatidis, A. G.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands4 aut |
| 700 | 1 | a Reich, W.u Max-Planck-Institut für Radioastronomie, Germany,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Harvard-Smithsonian Center for Astrophysics,Harvard-Smithsonian Center for Astrophysics, USA4 aut |
| 700 | 1 | a Röttgering, H.u Leiden University, The Netherlands4 aut |
| 700 | 1 | a Rowlinson, A.u CSIRO Australia Telescope National Facility, Australia4 aut |
| 700 | 1 | a Scaife, A. M. M.u University of Oxford, UK4 aut |
| 700 | 1 | a Schwarz, D.u Universität Bielefeld, Germany4 aut |
| 700 | 1 | a Sluman, J.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Smirnov, O.u Rhodes University, South Africa4 aut |
| 700 | 1 | a Stappers, B. W.u The University of Manchester, UK,University of Manchester,Max-Planck Institut für Radioastronomie,Max-Planck Institute for Radio Astronomy,Max Planck Institute for Astrophysics, Germany4 aut |
| 700 | 1 | a Steinmetz, M.u Leibniz-Institut für Astrophysik Potsdam (AIP), Germany4 aut |
| 700 | 1 | a Tagger, M.u LPC2E – Université d’Orléans/CNRS, France,Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Tang, Y.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Tasse, C.u Observatoire de Paris, France,Universität Bielefeld,Bielefeld University4 aut |
| 700 | 1 | a Thoudam, Satyendrau Radboud University Nijmegen, The Netherlands,Radboud Universiteit,Radboud University4 aut0 (Swepub:lnu)sathaa |
| 700 | 1 | a Toribio, M. C.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Vermeulen, R.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Vocks, C.u Leibniz-Institut für Astrophysik Potsdam (AIP), Germany,Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a van Weeren, R. J.u Harvard-Smithsonian Center for Astrophysics, USA4 aut |
| 700 | 1 | a White, S.u Max Planck Institute for Astrophysics, Germany4 aut |
| 700 | 1 | a Wise, M. W.u ASTRON, the Netherlands Institute for Radio Astronomy, Germany ; University of Amsterdam, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Yatawatta, S.u ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Zensus, A.u Max-Planck-Institut für Radioastronomie, Germany4 aut |
| 710 | 2 | a ASTRON, the Netherlands Institute for Radio Astronomy, The Netherlands ; University of Twente, The Netherlandsb Netherlands Institute for Radio Astronomy (ASTRON)4 org |
| 773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 574q 574x 0004-6361x 1432-0746 |
| 856 | 4 | u http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J%2FA%2BA%2F574%2FA73y VizieR on-line data |
| 856 | 4 | u https://www.aanda.org/articles/aa/pdf/2015/02/aa25042-14.pdf |
| 856 | 4 | u http://publications.lib.chalmers.se/records/fulltext/214604/local_214604.pdfx primaryx freey FULLTEXT |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-47974 |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/201425042 |
| 856 | 4 8 | u https://research.chalmers.se/publication/214604 |
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