Luminous red galaxies in the Kilo-Degree Survey: Selection with broad-band photometry and weak lensing measurements

Mohammadjavad Vakili, MacIej Bilicki, Henk Hoekstra, Nora Elisa Chisari, Michael J.I. Brown, Christos Georgiou, Arun Kannawadi, Konrad Kuijken, Angus H. Wright

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6 Citations (Scopus)

Abstract

We use the overlap between multiband photometry of the Kilo-Degree Survey (KiDS) and spectroscopic data based on the Sloan Digital Sky Survey and Galaxy And Mass Assembly to infer the colour-magnitude relation of red-sequence galaxies. We then use this inferred relation to select luminous red galaxies (LRGs) in the redshift range of 0.1 < z < 0.7 over the entire KiDS Data Release 3 footprint. We construct two samples of galaxies with different constant comoving densities and different luminosity thresholds. The selected red galaxies have photometric redshifts with typical photo-z errors of σz ∼0.014(1 + z) that are nearly uniform with respect to observational systematics. This makes them an ideal set of galaxies for lensing and clustering studies. As an example, we use the KiDS-450 cosmic shear catalogue to measure the mean tangential shear signal around the selected LRGs. We detect a significant weak lensing signal for lenses out to z ∼0.7.

Original languageEnglish
Pages (from-to)3715-3733
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume487
Issue number3
DOIs
Publication statusPublished - Aug 2019

Keywords

  • galaxies: distances and redshifts
  • gravitational lensing: weak
  • methods: data analysis
  • methods: statistical

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