Photometric redshifts for the next generation of deep radio continuum surveys - I: template fitting

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, Röttgering, Huub J A and Smith, Daniel J B (2018) Photometric redshifts for the next generation of deep radio continuum surveys - I: template fitting. Monthly Notices Of The Royal Astronomical Society, 473 (2). pp. 2655-2672. ISSN 0035-8711

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Abstract

We present a study of photometric redshift performance for galaxies and active galactic nuclei detected in deep radio continuum surveys. Using two multi-wavelength datasets, over the NOAO Deep Wide Field Survey Boötes and COSMOS fields, we assess photometric redshift (photo-z) performance for a sample of 4; 500 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 which equals or improves upon the performance of any individual template set.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QB Astronomy
Related URLs:
Depositing User: Billy Wichaidit
Date Deposited: 07 Nov 2017 12:15
Last Modified: 18 Jan 2018 16:34
URI: http://sro.sussex.ac.uk/id/eprint/71037

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