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

Kenneth J. Duncan; Michael J. I. Brown; Wendy L. Williams; Philip N. Best; Veronique Buat; Denis Burgarella; Matt J. Jarvis; Katarzyna Małek; S. J. Oliver; Huub J. A. Röttgering; Daniel J. B. Smith

doi:10.1093/mnras/stx2536

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

Kenneth J. Duncan, Michael J. I. Brown, Wendy L. Williams, Philip N. Best, Veronique Buat, Denis Burgarella, Matt J. Jarvis, Katarzyna Małek, S. J. Oliver, Huub J. A. Röttgering, Daniel J. B. Smith

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

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.

Original language	English
Pages (from-to)	2655-2672
Number of pages	18
Journal	Monthly Notices of the Royal Astronomical Society
Volume	473
Issue number	2
DOIs	https://doi.org/10.1093/mnras/stx2536
Publication status	Published - 2 Oct 2017

Keywords / Materials (for Non-textual outputs)

galaxies: active
galaxies: distances and redshifts
radio continuum: galaxies

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Duncan, K. J., Brown, M. J. I., Williams, W. L., Best, P. N., Buat, V., Burgarella, D., Jarvis, M. J., Małek, K., Oliver, S. J., Röttgering, H. J. A., & Smith, D. J. B. (2017). Photometric redshifts for the next generation of deep radio continuum surveys - I. Template fitting. Monthly Notices of the Royal Astronomical Society , 473(2), 2655-2672. https://doi.org/10.1093/mnras/stx2536

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

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 Bo{\"o}tes 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.",

keywords = "galaxies: active, galaxies: distances and redshifts, radio continuum: galaxies",

author = "Duncan, {Kenneth J.} and Brown, {Michael J. I.} and Williams, {Wendy L.} and Best, {Philip N.} and Veronique Buat and Denis Burgarella and Jarvis, {Matt J.} and Katarzyna Ma{\l}ek and Oliver, {S. J.} and R{\"o}ttgering, {Huub J. A.} and Smith, {Daniel J. B.}",

year = "2017",

month = oct,

day = "2",

doi = "10.1093/mnras/stx2536",

language = "English",

volume = "473",

pages = "2655--2672",

journal = "Monthly Notices of the Royal Astronomical Society ",

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T1 - Photometric redshifts for the next generation of deep radio continuum surveys - I. Template fitting

AU - Duncan, Kenneth J.

AU - Brown, Michael J. I.

AU - Williams, Wendy L.

AU - Best, Philip N.

AU - Buat, Veronique

AU - Burgarella, Denis

AU - Jarvis, Matt J.

AU - Małek, Katarzyna

AU - Oliver, S. J.

AU - Röttgering, Huub J. A.

AU - Smith, Daniel J. B.

PY - 2017/10/2

Y1 - 2017/10/2

N2 - 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.

AB - 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.

KW - galaxies: active

KW - galaxies: distances and redshifts

KW - radio continuum: galaxies

U2 - 10.1093/mnras/stx2536

DO - 10.1093/mnras/stx2536

M3 - Article

SN - 0035-8711

VL - 473

SP - 2655

EP - 2672

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 2

ER -

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

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Keywords / Materials (for Non-textual outputs)

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