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This article has an erratum: [https://doi.org/10.1051/0004-6361/202346801e]


Fig. 6.

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Comparison of the spectroscopic redshifts of the sources in the z-GAL sample that are single and multiple (where each source has a similar redshift) with the photometric redshifts derived using the methods of Ivison et al. (2016) and Pearson et al. (2013) – blue and red symbols, respectively (as listed in Tables A.6A.8 and A.1A.3, respectively). For each source, the two photometric redshift values are linked by a grey vertical line positioned at the spectroscopic redshift value. The solid line shows where the photometric and spectroscopic reshifts are equal and the dashed lines indicate the ±25% deviations. The significant spread here displayed is consistent with previous findings (e.g., Ivison et al. 2016; Reuter et al. 2020; Urquhart et al. 2022) and demonstrates that photometric redshifts, based on Herschel and, when available, SCUBA-2 850 μm continuum flux densities, are only indicative.

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