The LOFAR Two-metre Sky Survey. III. First data release: Optical/infrared identifications and value-added catalogue

  title={The LOFAR Two-metre Sky Survey. III. First data release: Optical/infrared identifications and value-added catalogue},
  author={W. Williams and M. Hardcastle and P. Best and J. Sabater and J. Croston and K. Duncan and T. Shimwell and H. Rottgering and D. Nisbet and G. Gurkan and L. Alegre and R. Cochrane and A. Goyal and C. Hale and N. Jackson and M. Jamrozy and R. Kondapally and M. Kunert-Bajraszewska and V. Mahatma and B. Mingo and L. Morabito and I. Prandoni and C. Roskowiński and A. Shulevski and D. Smith and C. Tasse and S. Urquhart and B. Webster and G. White and R. Beswick and J. Callingham and K. Chy.zy and F. Gasperin and J. Harwood and M. Hoeft and M. Iacobelli and J. McKean and A. Mechev and G. Miley and D. Schwarz and R. V. Weeren},
  journal={Astronomy and Astrophysics},
The LOFAR Two-metre Sky Survey (LoTSS) is an ongoing sensitive, high- resolution 120-168 MHz survey of the northern sky with diverse and ambitious science goals. Many of the scientific objectives of LoTSS rely upon, or are enhanced by, the association or separation of the sometimes incorrectly catalogued radio components into distinct radio sources and the identification and characterisation of the optical counterparts to these sources. We present the source associations and optical and/or IR… Expand
One- and two-point source statistics from the LOFAR Two-metre Sky Survey first data release
The LOFAR Two-metre Sky Survey (LoTSS) will map the complete Northern sky and provide an excellent opportunity to study the distribution and evolution of the large-scale structure of the Universe. WeExpand
Unveiling the rarest morphologies of the LOFAR Two-metre Sky Survey radio source population with self-organised maps
The LOFAR-PyBDSF Visualisation Tool, which allows users to explore the LoTSS dataset through the trained SOMs, and presents an illustration of their potential by finding an arbitrary number of morphologically rare sources in the authors' training data and subsequently in an area of the sky outside the training data. Expand
A LOFAR-IRAS cross-match study: the far-infrared radio correlation and the 150-MHz luminosity as a star-formation rate.
Aims. We aim to study the far-infrared radio correlation (FIRC) at 150 MHz in the local Universe (at a median redshift z~0:05) and improve the use of the rest-frame 150-MHz luminosity, L150, as aExpand
The LOFAR Two-meter Sky Survey: Deep Fields Data Release 1
The Low Frequency Array (LOFAR) is an ideal instrument to conduct deep extragalactic surveys. It has a large field of view and is sensitive to large-scale and compact emission. It is, however, veryExpand
Fundamental differences in the radio properties of red and blue quasars: insight from the LOFAR Two-metre Sky Survey (LoTSS)
Red quasi-stellar objects (QSOs) are a subset of the luminous end of the cosmic population of active galactic nuclei (AGN), most of which are reddened by intervening dust along the line-of-sightExpand
Radio Sources Associated with Optical Galaxies and Having Unresolved or Extended Morphologies (ROGUE). I. A Catalog of SDSS Galaxies with FIRST Core Identifications
We present the catalog of Radio sources associated with Optical Galaxies and having Unresolved or Extended morphologies I (ROGUE~I), consisting of 32,616 spectroscopically selected galaxies. It isExpand
The LOFAR Two-metre Sky Survey IV. First Data Release: Photometric redshifts and rest-frame magnitudes
16 figures, 1 table and 18 pages. This paper is part of the LOFAR surveys Data Release 1 and has been accepted for publication in a special edition of A&A that will appear in Feb 2019, Volume 622.Expand
Giant radio galaxies in the LOFAR Two-metre Sky Survey
Giant radio galaxies (GRGs) are a subclass of radio galaxies, which have grown to megaparsec scales. GRGs are much rarer than normal-sized radio galaxies (<0.7 Mpc) and the reason for their giganticExpand
Radio-loud AGN in the first LoTSS data release. The lifetimes and environmental impact of jet-driven sources
We constructed a sample of 23 344 radio-loud active galactic nuclei (RLAGN) from the catalogue derived from the LOFAR Two-Metre Sky Survey (LoTSS) survey of the HETDEX Spring field. AlthoughExpand
The LoTSS view of radio AGN in the local Universe. The most massive galaxies are always switched on
This paper presents a study of the local radio source population, by cross-comparing the data from the first data release (DR1) of the LOFAR Two-Metre Sky Survey (LoTSS) with the Sloan Digital SkyExpand


The LOFAR Two-metre Sky Survey. I. Survey description and preliminary data release
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 mostExpand
LOFAR/H-ATLAS: A deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
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 aroundExpand
LOFAR 150-MHz observations of the Boötes field: catalogue and source counts
We present the first wide area (19 deg(2)), deep (a parts per thousand 120-150 mu Jy beam(-1)), high-resolution (5.6 x 7.4 arcsec) LOFAR High Band Antenna image of the Bootes field made at 130-169Expand
The FIRST Survey: Faint Images of the Radio Sky at twenty centimeters
The FIRST survey to produce Faint Images of the Radio Sky at Twenty centimeters is now underway using the NRAO Very Large Array. We describe here the scientific motivation for a large-area sky surveyExpand
Herschel-ATLAS: VISTA VIKING near-infrared counterparts in the Phase 1 GAMA 9-h data
We identify near-infrared Ks-band counterparts to Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) submillimetre (submm) sources, using a preliminary object catalogue from the VISTAExpand
A deep VLA survey at 6 cm in the Lockman Hole
We have obtained a deep radio image with the Very Large Array at 6 cm in the Lockman Hole. The noise level in the central part of the field is about 11 µJy. From these data we have extracted aExpand
CENSORS: A Combined EIS–NVSS Survey Of Radio Sources — I. Sample definition, radio data and optical identifications
A new sample of radio sources, with the designated name CENSORS (A Combined EIS-NVSS Survey Of Radio Sources), has been defined by combining the National Radio Astronomy Observatory Very Large ArrayExpand
The likelihood ratio as a tool for radio continuum surveys with Square Kilometre Array precursor telescopes
In this paper we investigate the performance of the likelihood ratio method as a tool for identifying optical and infrared counterparts to proposed radio continuum surveys with Square Kilometre ArrayExpand
Matching Radio Catalogs with Realistic Geometry: Application to SWIRE and ATLAS
Crossmatching catalogs at different wavelengths is a difficult problem in astronomy, especially when the objects are not point-like. At radio wavelengths an object can have several componentsExpand
2MASS Extended Source Catalog: Overview and Algorithms
The Two Micron All Sky Survey (2MASS) will observe over 1,000,000 galaxies and extended Galactic sources covering the entire sky at wavelengths between 1 and 2 μm. Most of these galaxies will beExpand