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

Kenneth J Duncan, J. Sabater, H. J. A. Röttgering, M. J. Jarvis, D. J. B. Smith, P. N. Best, J. R. Callingham, R. Cochrane, J. H. Croston, M. J. Hardcastle, B. Mingo, L. Morabito, D. Nisbet, I. Prandoni, T. W. Shimwell, C. Tasse, G. J. White, W. L. Williams, L. Alegre, K. T. ChyżyG. Gürkan, M. Hoeft, R. Kondapally, A. P. Mechev, G. K. Miley, D. J. Schwarz, R. J. van Weeren

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Number of pages18
JournalAstronomy & Astrophysics
DOIs
Publication statusPublished - 1 Feb 2019

Keywords

  • astro-ph.GA
  • astro-ph.CO
  • astro-ph.HE

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