The LOFAR Two-metre Sky Survey. I. Survey description and preliminary data release

  title={The LOFAR Two-metre Sky Survey. I. Survey description and preliminary data release},
  author={Timothy W. Shimwell and H. J. A. Rottgering and Philip N. Best and Wendy L. Williams and Tammo Jan Dijkema and F. de Gasperin and Martin J. Hardcastle and George Heald and D. N. Hoang and Andreas Horneffer and Huib T. Intema and Elizabeth K. Mahony and S. Mandal and Alexandar Mechev and Leah K. Morabito and J. B. Raymond Oonk and David A. Rafferty and E. Retana-Montenegro and Jose Sabater and Cyril Tasse and Reinout J. van Weeren and Marcus Bruggen and Gianfranco Brunetti and K. T. Chy.zy and John Conway and Marijke Haverkorn and N. Jackson and Matt J. Jarvis and John P. McKean and George K. Miley and Raffaella Morganti and Glenn J. White and Michael W. Wise and Ilse van Bemmel and Rainer Beck and Marisa Brienza and Annalisa Bonafede and Gabriela Calistro Rivera and Rossella Cassano and Alex O. Clarke and D'avid Cseh and Adam T. Deller and Alexander Drabent and Wim van Driel and D. Engels and Heino Falcke and Chiara Ferrari and S. Frohlich and Michael A. Garrett and Jeremy J Harwood and Volker Heesen and M. Hoeft and C. Horellou and Frank P. Israel and Anna D. Kapi'nska and Magdalena Kunert‐Bajraszewska and Derek J. McKay and Niruj R. Mohan and Emanuela Orr'u and R F Pizzo and Isabella Prandoni and Dominik J. Schwarz and Aleksandar Shulevski and Michael Sipior and D. J. B. Smith and S. S. Sridhar and Matthias Steinmetz and Andra Stroe and Eskil Varenius and Paul van der Werf and J. Anton Zensus and Jonathan Zwart},
  journal={Astronomy and Astrophysics},
The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120-168 MHz imaging survey that will eventually cover the entire northern sky. Each of the 3170 pointings will be observed for 8 h, which, at most declinations, is sufficient to produce ~5? resolution images with a sensitivity of ~100 ?Jy/beam and accomplish the main scientific aims of the survey, which are to explore the formation and evolution of massive black holes, galaxies, clusters of galaxies and large-scale structure. Owing to the compact… 
The LOFAR Two-metre Sky Survey
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high-resolution 120–168 MHz survey of the entire northern sky for which observations are now 20% complete. We present our first
The LOFAR Two-metre Sky Survey Deep Fields
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Context.The LOFAR Two-metre Sky Survey (LoTSS) will eventually map the complete Northern sky and provide an excellent opportunity to study the distribution and evolution of the large-scale structure
Deep LOFAR 150 MHz imaging of the Boötes field: Unveiling the faint low-frequency sky
We have conducted a deep survey (with a central rms of 55 μJy) with the LOw Frequency ARray (LOFAR) at 120–168 MHz of the Boötes field, with an angular resolution of 3.98″ × 6.45″, and obtained a
LOFAR observations of the XMM-LSS field
We present observations of the XMM Large-Scale Structure (XMM-LSS) field observed with the LOw Frequency ARray (LOFAR) at 120–168 MHz. Centred at a J2000 declination of −4.5°, this is a challenging
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Faraday tomography allows us to map diffuse polarized synchrotron emission from our Galaxy and use it to interpret the magnetic field in the interstellar medium (ISM). We have applied Faraday


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We present Low-Frequency Array (LOFAR) High-Band Array observations of the Herschel-ATLAS North Galactic Pole survey area. The survey we have carried out, consisting of four pointings covering around
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This introductory paper describes in detail the motivation and design of the Multifrequency Snapshot Sky Survey, the first northern-sky LOFAR imaging survey, and outlines the plans for the ongoing production of the final survey products, and the ultimate public release of images and source catalogs.
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Abstract GLEAM, the GaLactic and Extragalactic All-sky MWA survey, is a survey of the entire radio sky south of declination + 25° at frequencies between 72 and 231 MHz, made with the MWA using a
The LOFAR long baseline snapshot calibrator survey
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 is conducted prior to the observation to identify the best calibrator.
LOFAR, the Low-Frequency Array, is a powerful new radio telescope operating between 10 and 240 MHz. LOFAR allows detailed sensitive high-resolution studies of the low-frequency radio sky. At the same
The VLA Low-Frequency Sky Survey
The VLA Low-frequency Sky Survey (VLSS) has imaged 95% of the 3π sr of sky north of δ = -30° at a frequency of 74 MHz (4 m wavelength). The resolution is 80″ (FWHM) throughout, and the typical rms
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We present the results of a recent re-reduction of the data from the Very Large Array (VLA) Low-frequency Sky Survey (VLSS). We used the VLSS catalog as a sky model to correct the ionospheric
The GMRT 150 MHz all-sky radio survey - First alternative data release TGSS ADR1
We present the first full release of a survey of the 150 MHz radio sky, observed with the Giant Metrewave Radio Telescope (GMRT) between April 2010 and March 2012 as part of the TIFR GMRT Sky Survey
High-resolution studies of radio sources in the Hubble Deep and Flanking Fields
18 days of MERLIN data and 42 h of A-array VLA data at 1.4 GHz have been combined to image a 10-arcmin field centred on the Hubble Deep Field (HDF). This area also includes the Hubble Flanking Fields