Edinburgh Research Explorer

KiDS+VIKING-450: A new combined optical & near-IR dataset for cosmology and astrophysics

Research output: Contribution to journalArticle

  • Angus H. Wright
  • Hendrik Hildebrandt
  • Konrad Kuijken
  • Thomas Erben
  • Hugo Buddelmeijer
  • Ami Choi
  • Jelte T. A. de Jong
  • Alastair Edge
  • Carlos Gonzalez-Fernandez
  • Eduardo González Solares
  • Aniello Grado
  • Mike Irwin
  • Aybuke Kupcu Yoldas
  • James R. Lewis
  • Nicola Napolitano
  • Mario Radovich
  • Peter Schneider
  • Cristóbal Sifón
  • William Sutherland
  • Gijs A. Verdoes Kleijn

Related Edinburgh Organisations

Original languageEnglish
Number of pages17
JournalAstronomy & astrophysics
Early online date22 Nov 2019
Publication statusPublished - 1 Dec 2019


We present the curation and verification of a new combined optical and near infrared dataset for cosmology and astrophysics, derived
from the combination of ugri-band imaging from the Kilo Degree Survey (KiDS) and ZYJHKs-band imaging from the VISTA Kilo
degree Infrared Galaxy (VIKING) survey. This dataset is unrivaled in cosmological imaging surveys due to its combination of area
(458 deg2 before masking), depth (r 25), and wavelength coverage (ugriZYJHKs). The combination of survey depth, area, and (most
importantly) wavelength coverage allows significant reductions in systematic uncertainties (i.e. reductions of between 10 and 60% in
bias, outlier rate, and scatter) in photometric-to-spectroscopic redshift comparisons, compared to the optical-only case at photo-z
above 0:7. The complementarity between our optical and NIR surveys means that over 80% of our sources, across all photo-z, have
significant detections (i.e. not upper limits) in our 8 reddest bands. We derive photometry, photo-z, and stellar masses for all sources
in the survey, and verify these data products against existing spectroscopic galaxy samples. We demonstrate the fidelity of our
higher-level data products by constructing the survey stellar mass functions in 8 volume-complete redshift bins. We find that these
photometrically derived mass functions provide excellent agreement with previous mass evolution studies derived using spectroscopic
surveys. The primary data products presented in this paper are publicly available at http://kids.strw.leidenuniv.nl/

    Research areas

  • astro-ph.CO, astro-ph.GA, astro-ph.IM

ID: 110655976