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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 13600naa a2201357 4500 | |
| 001 | oai:research.chalmers.se:340c461c-07f4-4dba-bc83-c2a4b44f8013 | |
| 003 | SwePub | |
| 008 | 220212s2022 | |||||||||||000 ||eng| | |
| 009 | oai:DiVA.org:su-202432 | |
| 024 | 7 | a https://doi.org/10.1051/0004-6361/2021406492 DOI |
| 024 | 7 | a https://research.chalmers.se/publication/5286502 URI |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2024322 URI |
| 040 | a (SwePub)cthd (SwePub)su | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a art2 swepub-publicationtype |
| 072 | 7 | a ref2 swepub-contenttype |
| 100 | 1 | a Morabito, L.u Durham University4 aut |
| 245 | 1 0 | a Sub-arcsecond imaging with the International LOFAR Telescope: I. Foundational calibration strategy and pipeline |
| 264 | c 2022-01-25 | |
| 264 | 1 | b EDP Sciences,c 2022 |
| 338 | a electronic2 rdacarrier | |
| 520 | a The International LOFAR Telescope is an interferometer with stations spread across Europe. With baselines of up to ∼2000 km, LOFAR has the unique capability of achieving sub-arcsecond resolution at frequencies below 200 MHz. However, it is technically and logistically challenging to process LOFAR data at this resolution. To date only a handful of publications have exploited this capability. Here we present a calibration strategy that builds on previous high-resolution work with LOFAR. It is implemented in a pipeline using mostly dedicated LOFAR software tools and the same processing framework as the LOFAR Two-metre Sky Survey (LoTSS). We give an overview of the calibration strategy and discuss the special challenges inherent to enacting high-resolution imaging with LOFAR, and describe the pipeline, which is publicly available, in detail. We demonstrate the calibration strategy by using the pipeline on P205+55, a typical LoTSS pointing with an 8 h observation and 13 international stations. We perform in-field delay calibration, solution referencing to other calibrators in the field, self-calibration of these calibrators, and imaging of example directions of interest in the field. We find that for this specific field and these ionospheric conditions, dispersive delay solutions can be transferred between calibrators up to ∼1.5° away, while phase solution transferral works well over ∼1°. We also demonstrate a check of the astrometry and flux density scale with the in-field delay calibrator source. Imaging in 17 directions, we find the restoring beam is typically ∼0.3″ ×0.2″ although this varies slightly over the entire 5 deg2 field of view. We find we can achieve ∼80-300 μJy bm-1 image rms noise, which is dependent on the distance from the phase centre; typical values are ∼90 μJy bm-1 for the 8 h observation with 48 MHz of bandwidth. Seventy percent of processed sources are detected, and from this we estimate that we should be able to image roughly 900 sources per LoTSS pointing. This equates to ∼ 3 million sources in the northern sky, which LoTSS will entirely cover in the next several years. Future optimisation of the calibration strategy for efficient post-processing of LoTSS at high resolution makes this estimate a lower limit. | |
| 650 | 7 | a NATURVETENSKAPx Fysikx Annan fysik0 (SwePub)103992 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Physical Sciencesx Other Physics Topics0 (SwePub)103992 hsv//eng |
| 650 | 7 | a TEKNIK OCH TEKNOLOGIERx Elektroteknik och elektronikx Signalbehandling0 (SwePub)202052 hsv//swe |
| 650 | 7 | a ENGINEERING AND TECHNOLOGYx Electrical Engineering, Electronic Engineering, Information Engineeringx Signal Processing0 (SwePub)202052 hsv//eng |
| 650 | 7 | a NATURVETENSKAPx Data- och informationsvetenskapx Datorseende och robotik0 (SwePub)102072 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Computer and Information Sciencesx Computer Vision and Robotics0 (SwePub)102072 hsv//eng |
| 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 Galaxies: jets | |
| 653 | a Galaxies: active | |
| 653 | a Radiation mechanisms: non-thermal | |
| 653 | a Techniques: high angular resolution | |
| 700 | 1 | a Jackson, N. J.u University of Manchester4 aut |
| 700 | 1 | a Mooney, S.u Jagiellonian University in Kraków, Poland4 aut |
| 700 | 1 | a Sweijen, F.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Badole, S.u University of Manchester4 aut |
| 700 | 1 | a Kukreti, P.u Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Venkattu, Deepikau Stockholms universitet,Institutionen för astronomi,Alba Nova Universitetscentrum,AlbaNova University Center. Stockholm Center for Physics, Astronomy and Biotechnology4 aut0 (Swepub:su)deve3138 |
| 700 | 1 | a Groeneveld, C.u Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Kappes, A.u Julius-Maximilians Universität Würzburg,University of Würzburg4 aut |
| 700 | 1 | a Bonnassieux, E.u Universita di Bologna,University of Bologna4 aut |
| 700 | 1 | a Drabent, A.u Thüringer Landessternwarte Tautenburg4 aut |
| 700 | 1 | a Iacobelli, M.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Croston, J. H.u Open University4 aut |
| 700 | 1 | a Best, P. N.u University of Edinburgh4 aut |
| 700 | 1 | a Bondi, M.u Istituto di Radioastronomia4 aut |
| 700 | 1 | a Callingham, J. R.u Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Conway, John,d 1963u Chalmers tekniska högskola,Chalmers University of Technology4 aut0 (Swepub:cth)jconway |
| 700 | 1 | a Deller, A.u Swinburne University of Technology,Deutsches Elektronen-Synchrotron (DESY),Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)4 aut |
| 700 | 1 | a Hardcastle, M. J.u University of Hertfordshire,Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen,Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)4 aut |
| 700 | 1 | a McKean, J.u Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen,Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ),Technische Universität Berlin,Technische Universiteit Eindhoven,Eindhoven University of Technology,Station de Radioastronomie de Nançay,Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Miley, G. K.u Universiteit Leiden (UL),Leiden University (UL),Julius-Maximilians Universität Würzburg,University of Würzburg4 aut |
| 700 | 1 | a Moldon, J.u Instituto de Astrofisica de Andalucía (IAA),Institute of Astrophysics of Andalusia (IAA)4 aut |
| 700 | 1 | a Röttgering, H. J.A.u Universiteit Leiden (UL),Leiden University (UL),Shell Technology Center,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Tasse, C.u Observatoire de Paris-Meudon,Rhodes University4 aut |
| 700 | 1 | a Shimwell, T. W.u Netherlands Institute for Radio Astronomy (ASTRON),Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a van Weeren, R.u Universiteit Leiden (UL),Leiden University (UL),Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Anderson, J. M.u Deutsches GeoForschungsZentrum (GFZ),German Research Centre for Geosciences (GFZ),Technische Universität Berlin4 aut |
| 700 | 1 | a Asgekar, A.u Shell Technology Center,Netherlands Institute for Radio Astronomy (ASTRON),Universita di Bologna,University of Bologna,Istituto di Radioastronomia,Universität Hamburg,University of Hamburg,Vrije Universiteit Brüssel (VUB),Vrije Universiteit Brussel (VUB),Radboud Universiteit,Radboud University,University of Manchester,Universiteit Leiden (UL),Leiden University (UL),George Washington University,University of Warmia and Mazury in Olsztyn,Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Avruch, I.M.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a van Bemmel, I.u Joint Institute for VLBI in Europe (JIVE)4 aut |
| 700 | 1 | a Bentum, M. J.u Technische Universiteit Eindhoven,Eindhoven University of Technology,Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Bonafede, A.u Universita di Bologna,University of Bologna,Istituto di Radioastronomia,Universität Hamburg,University of Hamburg4 aut |
| 700 | 1 | a Brouw, W. N.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Butcher, H. R.u Australian National University,Polish Academy of Sciences4 aut |
| 700 | 1 | a Ciardi, B.u Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Corstanje, A.u Vrije Universiteit Brüssel (VUB),Vrije Universiteit Brussel (VUB),Radboud Universiteit,Radboud University4 aut |
| 700 | 1 | a Coolen, A. H.W.M.u Netherlands Institute for Radio Astronomy (ASTRON),Thüringer Landessternwarte Tautenburg4 aut |
| 700 | 1 | a Damstra, Siedsu Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a De Gasperin, F.u Universität Hamburg,University of Hamburg,Istituto di Radioastronomia4 aut |
| 700 | 1 | a Duscha, S.u Netherlands Institute for Radio Astronomy (ASTRON),Universität Bielefeld,Bielefeld University4 aut |
| 700 | 1 | a Eisloffel, J.u Thüringer Landessternwarte Tautenburg,Ruhr-Universität Bochum4 aut |
| 700 | 1 | a Engels, D.u Universität Hamburg,University of Hamburg4 aut |
| 700 | 1 | a Falcke, H.D.u Radboud Universiteit,Radboud University4 aut |
| 700 | 1 | a Garrett, M. A.u University of Manchester,Universiteit Leiden (UL),Leiden University (UL),Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Grießmeier, J.M.u Station de Radioastronomie de Nançay,Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Gunst, A.W.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a van Haarlem, M. P.u Netherlands Institute for Radio Astronomy (ASTRON),Rijksuniversiteit Groningen,University of Groningen,Université de Lyon4 aut |
| 700 | 1 | a Hoeft, M.u Thüringer Landessternwarte Tautenburg4 aut |
| 700 | 1 | a van der Horst, A. J.u George Washington University4 aut |
| 700 | 1 | a Jutte, E.u Ruhr-Universität Bochum4 aut |
| 700 | 1 | a Kadler, M.u Julius-Maximilians Universität Würzburg,University of Würzburg4 aut |
| 700 | 1 | a Koopmans, L.V.E.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Krankowski, A.u University of Warmia and Mazury in Olsztyn4 aut |
| 700 | 1 | a Mann, G.u Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Nelles, A.u Deutsches Elektronen-Synchrotron (DESY),Friedrich-Alexander-Universität Erlangen Nurnberg (FAU)4 aut |
| 700 | 1 | a Oonk, J. B. R.u Surfsara Bv4 aut |
| 700 | 1 | a Orrú, E.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Paas, H.u Rijksuniversiteit Groningen,University of Groningen4 aut |
| 700 | 1 | a Pandey, V. N.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Pizzo, R.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Pandey-Pommier, M.u Université de Lyon,LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique,Station de Radioastronomie de Nançay4 aut |
| 700 | 1 | a Reich, W.u Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Rothkaehl, Hannau Polish Academy of Sciences4 aut |
| 700 | 1 | a Ruiter, Marku Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Schwarz, D. J.u Universität Bielefeld,Bielefeld University4 aut |
| 700 | 1 | a Shulevski, A.u Universiteit Van Amsterdam,University of Amsterdam,Universiteit Leiden (UL),Leiden University (UL)4 aut |
| 700 | 1 | a Soida, M.u Jagiellonian University in Kraków, Poland4 aut |
| 700 | 1 | a Tagger, M.u Universite d'Orleans,University of Orléans4 aut |
| 700 | 1 | a Vocks, C.u Leibniz-Institut Für Astrophysik Potsdam,Leibniz Institute for Astrophysics Potsdam4 aut |
| 700 | 1 | a Wijers, Ramju Universiteit Van Amsterdam,University of Amsterdam4 aut |
| 700 | 1 | a Wijnholds, S. J.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 700 | 1 | a Wucknitz, O.u Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)4 aut |
| 700 | 1 | a Zarka, P.M.u LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique,Station de Radioastronomie de Nançay4 aut |
| 700 | 1 | a Zucca, P.u Netherlands Institute for Radio Astronomy (ASTRON)4 aut |
| 710 | 2 | a Durham Universityb University of Manchester4 org |
| 773 | 0 | t Astronomy and Astrophysicsd : EDP Sciencesg 658q 658x 0004-6361x 1432-0746 |
| 856 | 4 | u https://research.chalmers.se/publication/528650/file/528650_Fulltext.pdfx primaryx freey FULLTEXT |
| 856 | 4 | u https://www.aanda.org/articles/aa/pdf/forth/aa40649-21.pdf |
| 856 | 4 | u https://doi.org/10.1051/0004-6361/202140649y Fulltext |
| 856 | 4 8 | u https://doi.org/10.1051/0004-6361/202140649 |
| 856 | 4 8 | u https://research.chalmers.se/publication/528650 |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-202432 |
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