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        Photometric redshifts for the next generation of deep radio continuum surveys - I. Template fitting

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        Author
        Duncan, Kenneth J.
        Brown, Michael J. I.
        Williams, Wendy L.
        Best, Philip N.
        Buat, Veronique
        Burgarella, Denis
        Jarvis, Matt J.
        Malek, Katarzyna
        Oliver, S. J.
        Rottgering, Huub J. A.
        Smith, Daniel J. B.
        Attention
        2299/20579
        Abstract
        We present a study of photometric redshift performance for galaxies and active galactic nuclei detected in deep radio continuum surveys. Using two multiwavelength data sets, over the NOAO Deep Wide Field Survey Boötes and COSMOS fields, we assess photometric redshift (photo-z) performance for a sample of ~4500 radio continuum sources with spectroscopic redshifts relative to those of ~63 000 non-radio-detected sources in the same fields. We investigate the performance of three photometric redshift template sets as a function of redshift, radio luminosity and infrared/X-ray properties.We find that no single template library is able to provide the best performance across all subsets of the radio-detected population, with variation in the optimum template set both between subsets and between fields. Through a hierarchical Bayesian combination of the photo-z estimates from all three template sets, we are able to produce a consensus photo-z estimate that equals or improves upon the performance of any individual template set.
        Publication date
        2018-01-11
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1093/mnras/stx2536
        Other links
        http://hdl.handle.net/2299/20579
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