The LOFAR Two-metre Sky Survey: II. First data release
Reviewartikel, 2019

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 full-quality public data release. For this data release 424 square degrees, or 2% of the eventual coverage, in the region of the HETDEX Spring Field (right ascension 10h45m00s to 15h30m00s and declination 45°00′00″ to 57°00′00″) were mapped using a fully automated direction-dependent calibration and imaging pipeline that we developed. A total of 325 694 sources are detected with a signal of at least five times the noise, and the source density is a factor of ∼10 higher than the most sensitive existing very wide-area radio-continuum surveys. The median sensitivity is S144 MHz = 71 μJy beam -1 and the point-source completeness is 90% at an integrated flux density of 0.45 mJy. The resolution of the images is 6″ and the positional accuracy is within 0.2″. This data release consists of a catalogue containing location, flux, and shape estimates together with 58 mosaic images that cover the catalogued area. In this paper we provide an overview of the data release with a focus on the processing of the LOFAR data and the characteristics of the resulting images. In two accompanying papers we provide the radio source associations and deblending and, where possible, the optical identifications of the radio sources together with the photometric redshifts and properties of the host galaxies. These data release papers are published together with a further ∼20 articles that highlight the scientific potential of LoTSS.

Radio continuum: general

Catalogs

Techniques: image processing

Surveys

Författare

T. W. Shimwell

Netherlands Institute for Radio Astronomy (ASTRON)

C. Tasse

GEPI - Galaxies, Etoiles, Physique, Instrumentation

M. J. Hardcastle

University of Hertfordshire

A. P. Mechev

Universiteit Leiden

W. L. Williams

University of Hertfordshire

P.N. Best

Royal Observatory

H. Rottgering

Universiteit Leiden

J. R. Callingham

Netherlands Institute for Radio Astronomy (ASTRON)

T. J. Dijkema

Netherlands Institute for Radio Astronomy (ASTRON)

F. De Gasperin

Universiteit Leiden

D. N. Hoang

Universiteit Leiden

B. Hugo

Rhodes University

M. Mirmont

Ampyx Power B.V

J. B. R. Oonk

Netherlands Institute for Radio Astronomy (ASTRON)

I. Prandoni

Istituto di Radioastronomia

D. Rafferty

Universität Hamburg

J. Sabater

Royal Observatory

O. Smirnov

Rhodes University

R. van Weeren

Universiteit Leiden

G. White

Open University

M. Atemkeng

Rhodes University

L. Bester

Rhodes University

E. Bonnassieux

Square Kilometre Array, South Africa

M. Brueggen

Universität Hamburg

G. Brunetti

Istituto di Radioastronomia

K. T. Chy

Uniwersytet Jagiellonski w Krakowie

R. Cochrane

Royal Observatory

John Conway

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

J. H. Croston

Open University

A. Danezi

SURFsara, Netherlands

K. Duncan

Universiteit Leiden

M. Haverkorn

Radboud Universiteit

G. Heald

CSIRO Astronomy and Space Science

M. Iacobelli

Netherlands Institute for Radio Astronomy (ASTRON)

H. T. Intema

Universiteit Leiden

N. Jackson

University of Manchester

M. Jamrozy

Uniwersytet Jagiellonski w Krakowie

M.J. Jarvis

University of Oxford

R. Lakhoo

University of Oxford

M. Mevius

Netherlands Institute for Radio Astronomy (ASTRON)

G. Miley

Universiteit Leiden

L. Morabito

University of Oxford

R. Morganti

Netherlands Institute for Radio Astronomy (ASTRON)

D. Nisbet

Royal Observatory

E. Orrú

Netherlands Institute for Radio Astronomy (ASTRON)

S. Perkins

Square Kilometre Array, South Africa

R. Pizzo

SURFsara, Netherlands

C. Schrijvers

University of Hertfordshire

D. J.B. Smith

Netherlands Institute for Radio Astronomy (ASTRON)

R. Vermeulen

Netherlands Institute for Radio Astronomy (ASTRON)

M. W. Wise

Royal Observatory

L. Alegre

University of Portsmouth

D.J. Bacon

Joint Institute for VLBI in Europe (JIVE)

I. van Bemmel

University of Manchester

R. J. Beswick

Universität Hamburg

A. Bonafede

Istituto di Radioastronomia

A. Botteon

S. Bourke

Netherlands Institute for Radio Astronomy (ASTRON)

M. Brienza

Universiteit Leiden

G. Calistro Rivera

Istituto di Radioastronomia

R. Cassano

University of Manchester

A. O. Clarke

University of Nottingham

C. Conselice

Ruhr-Universität Bochum

R. J. Dettmar

Thüringer Landessternwarte Tautenburg

A. Drabent

Thüringer Landessternwarte Tautenburg

C. Dumba

Thüringer Landessternwarte Tautenburg

K.L. Emig

Universiteit Leiden

T.A. Enßlin

Max-Planck-Gesellschaft

C. Ferrari

Observatoire de la Cote d'Azur

M. A. Garrett

University of Manchester

R.T. Génova-Santos

Universiteit Leiden

A. Goyal

Instituto Astrofisico de Canarias

G. Gurkan

Universidad de la Laguna

C. Hale

Rhodes University

J. J. Harwood

CSIRO Astronomy and Space Science

V. Heesen

University of Oxford

M. Hoeft

University of Hertfordshire

Cathy Horellou

Universität Hamburg

C. Jackson

Thüringer Landessternwarte Tautenburg

G. Kokotanekov

R. Kondapally

Netherlands Institute for Radio Astronomy (ASTRON)

M. Kunert-Bajraszewska

Universiteit Van Amsterdam

V. Mahatma

Royal Observatory

E. Mahony

Uniwersytet Mikołaja Kopernika w Toruniu

S. Mandal

University of Hertfordshire

J. McKean

CSIRO Astronomy and Space Science

A. Merloni

Max-Planck-Gesellschaft

B. Mingo

LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique

A. Miskolczi

Ruhr-Universität Bochum

S. Mooney

Max-Planck-Gesellschaft

B. Nikiel-Wroczyński

University College Dublin

Shane P. O'Sullivan

Uniwersytet Jagiellonski w Krakowie

J. Quinn

Universität Hamburg

W. Reich

University College Dublin

C. Roskowiński

Max-Planck-Gesellschaft

A. Rowlinson

Uniwersytet Mikołaja Kopernika w Toruniu

F. Savini

Universität Hamburg

A. Saxena

Universiteit Leiden

D. J. Schwarz

Universität Bielefeld

A. Shulevski

Netherlands Institute for Radio Astronomy (ASTRON)

S. S. Sridhar

Netherlands Institute for Radio Astronomy (ASTRON)

H.R. Stacey

Netherlands Institute for Radio Astronomy (ASTRON)

S. Urquhart

Open University

M. H. D. van der Wiel

Netherlands Institute for Radio Astronomy (ASTRON)

Eskil Varenius

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

B. Webster

Open University

A. Wilber

Universität Hamburg

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 622 A1

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201833559

Mer information

Senast uppdaterat

2021-01-05