The LOFAR Two-metre Sky Survey: V. Second data release

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The LOFAR Two-metre Sky Survey: V. Second data release

Shimwell, T. W. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Hardcastle, M. J. (author): University of Hertfordshire

Tasse, C. (author): Observatoire de Paris,Paris Observatory

Best, P. N. (author): University of Edinburgh

Röttgering, H. J.A. (author): Universiteit Leiden (UL),Leiden University (UL)

Williams, W. L. (author): Universiteit Leiden (UL),Leiden University (UL)

Botteon, A. (author): Universiteit Leiden (UL),Leiden University (UL)

Drabent, A. (author): Thüringer Landessternwarte Tautenburg

Mechev, A. P. (author): Universiteit Leiden (UL),Leiden University (UL)

Shulevski, A. (author): Universiteit Leiden (UL),Leiden University (UL)

van Weeren, R. (author): Universiteit Leiden (UL),Leiden University (UL)

Bester, L. (author): Rhodes University

Bruggen, M. (author): Universität Hamburg,University of Hamburg

Brunetti, G. (author): Istituto di Radioastronomia

Callingham, J. R. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Chyz̊y, K.T. (author): Jagiellonian University in Kraków, Poland

Conway, John, 1963 (author): Chalmers tekniska högskola,Chalmers University of Technology

Dijkema, T. J. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Duncan, K. (author): University of Edinburgh

De Gasperin, F. (author): Universität Hamburg,University of Hamburg

Hale, C. (author): University of Edinburgh

Haverkorn, M. (author): Radboud Universiteit,Radboud University

Hugo, B. (author): Rhodes University

Jackson, N. (author): University of Manchester

Mevius, M. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Miley, G. K. (author): Universiteit Leiden (UL),Leiden University (UL)

Morabito, L. (author): Durham University

Morganti, R. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Offringa, A. R. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Oonk, J. B. R. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Rafferty, D. (author): Universität Hamburg,University of Hamburg

Sabater, J. (author): University of Edinburgh

Smith, D.J.B. (author): University of Hertfordshire

Schwarz, D. J. (author): Universität Bielefeld,Bielefeld University

Smirnov, O. (author): Rhodes University

Oasullivan, S.P. (author): Dublin City University

Vedantham, Harish K. (author): Netherlands Institute for Radio Astronomy (ASTRON)

White, G.J. (author): STFC Rutherford Appleton Laboratory

Albert, J.G. (author): Universiteit Leiden (UL),Leiden University (UL)

Alegre, L. (author): University of Edinburgh

Asabere, B. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Bacon, D.J. (author): University of Portsmouth

Bonafede, A. (author): Universität Hamburg,University of Hamburg

Bonnassieux, E. (author): Universita di Bologna,University of Bologna

Brienza, M. (author): Istituto di Radioastronomia

Bilicki, M. (author): Polish Academy of Sciences

Bonato, M. (author): Istituto di Radioastronomia

Calistro Rivera, G. (author): European Southern Observatory (ESO)

Cassano, R. (author): Istituto di Radioastronomia

Cochrane, R. (author): Harvard-Smithsonian Center for Astrophysics

Croston, J. H. (author): Open University

Cuciti, V. (author): Universität Hamburg,University of Hamburg

Dallacasa, D. (author): Istituto di Radioastronomia

Danezi, A. (author)

Dettmar, R. -J. (author): Ruhr-Universität Bochum

Di Gennaro, G. (author): Universität Hamburg,University of Hamburg

Edler, H.W. (author): Universität Hamburg,University of Hamburg

Enalin, T.A. (author): Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)

Emig, K.L. (author): National Radio Astronomy Observatory

Franzen, T. M.O. (author): Netherlands Institute for Radio Astronomy (ASTRON)

García-Vergara, C. (author): Universiteit Leiden (UL),Leiden University (UL)

Grange, Y. G. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Gurkan, G. (author): Thüringer Landessternwarte Tautenburg

Hajduk, M. (author): Radboud Universiteit,Radboud University

Heald, G. (author): Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Heesen, V. (author): Universität Hamburg,University of Hamburg

Hoang, D. N. (author): Universität Hamburg,University of Hamburg

Hoeft, M. (author): Thüringer Landessternwarte Tautenburg

Horellou, Cathy, 1967 (author): Chalmers tekniska högskola,Chalmers University of Technology

Iacobelli, M. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Jamrozy, M. (author): Jagiellonian University in Kraków, Poland

Jelia, V. (author): Ruder Boskovic Institute

Kondapally, R. (author): University of Edinburgh

Kukreti, P. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Kunert-Bajraszewska, M. (author): Uniwersytet Mikolaja Kopernika w Toruniu,Nicolaus Copernicus University

Magliocchetti, M. (author): Istituto nazionale di astrofisica (INAF)

Mahatma, V. (author): Thüringer Landessternwarte Tautenburg

Maaek, K. (author)

Mandal, S. (author): Universiteit Leiden (UL),Leiden University (UL)

Massaro, F. (author): Universita degli Studi di Torino,University of Turin

Meyer-Zhao, Z. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Mingo, B. (author): Open University

Mostert, R.I.J. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Nair, Dhanya G. (author): Joint Institute for VLBI in Europe (JIVE)

Nakoneczny, S.J. (author)

Nikiel-Wroczyaski, B. (author): Jagiellonian University in Kraków, Poland

Orrú, E. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Pajdosz-Amierciak, U. (author): Jagiellonian University in Kraków, Poland

Pasini, T. (author): Universität Hamburg,University of Hamburg

Prandoni, I. (author): Istituto di Radioastronomia

Van Piggelen, H.E. (author)

Rajpurohit, K. (author): Istituto di Radioastronomia

Retana-Montenegro, E. (author): University of KwaZulu-Natal

Riseley, C. J. (author): Istituto di Radioastronomia

Rowlinson, A. (author): Netherlands Institute for Radio Astronomy (ASTRON)

Saxena, A. (author): University College London (UCL)

Schrijvers, C. (author)

Sweijen, F. (author): Universiteit Leiden (UL),Leiden University (UL)

Siewert, T.M. (author): Universität Bielefeld,Bielefeld University

Timmerman, R. (author): Universiteit Leiden (UL),Leiden University (UL)

Vaccari, M. (author): Istituto di Radioastronomia

Vink, J. (author): Anton Pannekoek Institute for Astronomy

West, Jennifer L. (author): University of Toronto

Woaowska, A. (author): Commonwealth Scientific and Industrial Research Organisation (CSIRO)

Zhang, X. (author): Universiteit Leiden (UL),Leiden University (UL)

Zheng, J. (author): University of Portsmouth

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(creator_code:org_t)

2022-02-25
2022
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 659

Related links:: https://research.cha... (primary) (free); show more...; https://www.aanda.or...; https://research.cha...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

In this data release from the ongoing LOw-Frequency ARray (LOFAR) Two-metre Sky Survey we present 120a 168 MHz images covering 27% of the northern sky. Our coverage is split into two regions centred at approximately 12h45m +44 30a and 1h00m +28 00a and spanning 4178 and 1457 square degrees respectively. The images were derived from 3451 h (7.6 PB) of LOFAR High Band Antenna data which were corrected for the direction-independent instrumental properties as well as direction-dependent ionospheric distortions during extensive, but fully automated, data processing. A catalogue of 4 396 228 radio sources is derived from our total intensity (Stokes I) maps, where the majority of these have never been detected at radio wavelengths before. At 6a resolution, our full bandwidth Stokes I continuum maps with a central frequency of 144 MHz have: a median rms sensitivity of 83 μJy beama 1; a flux density scale accuracy of approximately 10%; an astrometric accuracy of 0.2a; and we estimate the point-source completeness to be 90% at a peak brightness of 0.8 mJy beama 1. By creating three 16 MHz bandwidth images across the band we are able to measure the in-band spectral index of many sources, albeit with an error on the derived spectral index of > a ±a 0.2 which is a consequence of our flux-density scale accuracy and small fractional bandwidth. Our circular polarisation (Stokes V) 20a resolution 120a168 MHz continuum images have a median rms sensitivity of 95 μJy beama 1, and we estimate a Stokes I to Stokes V leakage of 0.056%. Our linear polarisation (Stokes Q and Stokes U) image cubes consist of 480a A a 97.6 kHz wide planes and have a median rms sensitivity per plane of 10.8 mJy beama 1 at 4a and 2.2 mJy beama 1 at 20a; we estimate the Stokes I to Stokes Q/U leakage to be approximately 0.2%. Here we characterise and publicly release our Stokes I, Q, U and V images in addition to the calibrated uv-data to facilitate the thorough scientific exploitation of this unique dataset.

Subject headings

NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Geofysik (hsv//swe)
NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Geophysics (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Signalbehandling (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Signal Processing (hsv//eng)
TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk bildbehandling (hsv//swe)
ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Image Processing (hsv//eng)

Keyword

Techniques: image processing
Surveys
Catalogs
Radio continuum: general

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By the author/editor: Shimwell, T. W.; Hardcastle, M. J ...; Tasse, C.; Best, P. N.; Röttgering, H. J ...; Williams, W. L.; show more...; Botteon, A.; Drabent, A.; Mechev, A. P.; Shulevski, A.; van Weeren, R.; Bester, L.; Bruggen, M.; Brunetti, G.; Callingham, J. R ...; Chyz̊y, K.T.; Conway, John, 19 ...; Dijkema, T. J.; Duncan, K.; De Gasperin, F.; Hale, C.; Haverkorn, M.; Hugo, B.; Jackson, N.; Mevius, M.; Miley, G. K.; Morabito, L.; Morganti, R.; Offringa, A. R.; Oonk, J. B. R.; Rafferty, D.; Sabater, J.; Smith, D.J.B.; Schwarz, D. J.; Smirnov, O.; Oasullivan, S.P.; Vedantham, Haris ...; White, G.J.; Albert, J.G.; Alegre, L.; Asabere, B.; Bacon, D.J.; Bonafede, A.; Bonnassieux, E.; Brienza, M.; Bilicki, M.; Bonato, M.; Calistro Rivera, ...; Cassano, R.; Cochrane, R.; Croston, J. H.; Cuciti, V.; Dallacasa, D.; Danezi, A.; Dettmar, R. -J.; Di Gennaro, G.; Edler, H.W.; Enalin, T.A.; Emig, K.L.; Franzen, T. M.O.; García-Vergara, ...; Grange, Y. G.; Gurkan, G.; Hajduk, M.; Heald, G.; Heesen, V.; Hoang, D. N.; Hoeft, M.; Horellou, Cathy, ...; Iacobelli, M.; Jamrozy, M.; Jelia, V.; Kondapally, R.; Kukreti, P.; Kunert-Bajraszew ...; Magliocchetti, M ...; Mahatma, V.; Maaek, K.; Mandal, S.; Massaro, F.; Meyer-Zhao, Z.; Mingo, B.; Mostert, R.I.J.; Nair, Dhanya G.; Nakoneczny, S.J.; Nikiel-Wroczyask ...; Orrú, E.; Pajdosz-Amiercia ...; Pasini, T.; Prandoni, I.; Van Piggelen, H. ...; Rajpurohit, K.; Retana-Montenegr ...; Riseley, C. J.; Rowlinson, A.; Saxena, A.; Schrijvers, C.; Sweijen, F.; Siewert, T.M.; Timmerman, R.; Vaccari, M.; Vink, J.; West, Jennifer L ...; Woaowska, A.; Zhang, X.; Zheng, J.; show less...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Earth and Relate ...; and Geophysics

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Electrical Engin ...; and Signal Processin ...

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Medical Engineer ...; and Medical Image Pr ...

Articles in the publication: Astronomy and As ...

By the university: Chalmers University of Technology

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