The LOFAR Two-metre Sky Survey IV. First Data Release: Photometric redshifts and rest-frame magnitudes
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Author
Duncan, Kenneth J
Sabater, J.
Röttgering, H. J. A.
Jarvis, M. J.
Smith, D. J. B.
Best, P. N.
Callingham, J. R.
Cochrane, R.
Croston, J. H.
Hardcastle, M. J.
Mingo, B.
Morabito, L.
Nisbet, D.
Prandoni, I.
Shimwell, T. W.
Tasse, C.
White, G. J.
Williams, W. L.
Alegre, L.
Chyży, K. T.
Gürkan, G.
Hoeft, M.
Kondapally, R.
Mechev, A. P.
Miley, G. K.
Schwarz, D. J.
Weeren, R. J. van
Attention
2299/20953
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.