University of Hertfordshire

From the same journal

From the same journal

By the same authors

The LOFAR Two-metre Sky Survey IV. First Data Release: Photometric redshifts and rest-frame magnitudes

Research output: Contribution to journalArticlepeer-review


  • 1811.07928v1

    Accepted author manuscript, 2.24 MB, PDF document

  • Kenneth J Duncan
  • J. Sabater
  • H. J. A. Röttgering
  • M. J. Jarvis
  • P. N. Best
  • J. R. Callingham
  • R. Cochrane
  • J. H. Croston
  • B. Mingo
  • L. Morabito
  • D. Nisbet
  • I. Prandoni
  • T. W. Shimwell
  • C. Tasse
  • G. J. White
  • W. L. Williams
  • L. Alegre
  • K. T. Chyży
  • G. Gürkan
  • M. Hoeft
  • R. Kondapally
  • A. P. Mechev
  • G. K. Miley
  • D. J. Schwarz
  • R. J. van Weeren
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Original languageEnglish
JournalAstronomy & Astrophysics
Early online date19 Nov 2018
Publication statusE-pub ahead of print - 19 Nov 2018


The LOFAR Two-metre Sky Survey (LoTSS) is a sensitive, high-resolution 120-168 MHz survey of the Northern sky. The LoTSS First Data Release (DR1) presents 424 square degrees of radio continuum observations over the HETDEX Spring Field (10h45m00s $ 0.15$) of 7.9%. We also find that, at a given redshift, there is no strong trend in photo-$z$ quality as a function of radio luminosity. However there are strong trends as a function of redshift for a given radio luminosity, a result of selection effects in the spectroscopic sample and/or intrinsic evolution within the radio source population. Additionally, for the sample of sources in the LoTSS First Data Release with optical counterparts, we present rest-frame optical and mid-infrared magnitudes based on template fits to the consensus photometric (or spectroscopic when available) redshift.


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. The catalogues and images from the data release will be publicly available at upon publication of the volume. Reproduced with permission from Astronomy & Astrophysics. © 2019 ESO.


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