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; Christos Georgiou; Arun Kannawadi; Koen Kuijken; Angus H. Wright

doi:10.48550/arXiv.1811.02518

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, Christos Georgiou, Arun Kannawadi, Koen Kuijken, Angus H. Wright

Research output: Working paper › Preprint › Academic

Abstract

We use the overlap between multiband photometry of the Kilo-Degree Survey (KiDS) and spectroscopic data based on the Sloan Digital Sky Survey (SDSS) and Galaxy And Mass Assembly (GAMA) 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 language	English
Publisher	arXiv
Pages	1-19
DOIs	https://doi.org/10.48550/arXiv.1811.02518
Publication status	Published - 6 Nov 2018

Keywords

astro-ph.CO

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1811.02518v1Submitted manuscript, 1.94 MB

https://arxiv.org/abs/1811.02518

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title = "Luminous red galaxies in the Kilo Degree Survey: selection with broad-band photometry and weak lensing measurements",

abstract = "We use the overlap between multiband photometry of the Kilo-Degree Survey (KiDS) and spectroscopic data based on the Sloan Digital Sky Survey (SDSS) and Galaxy And Mass Assembly (GAMA) 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.",

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author = "Mohammadjavad Vakili and Maciej Bilicki and Henk Hoekstra and Chisari, {Nora Elisa} and Christos Georgiou and Arun Kannawadi and Koen Kuijken and Wright, {Angus H.}",

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T1 - Luminous red galaxies in the Kilo Degree Survey

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AU - Vakili, Mohammadjavad

AU - Bilicki, Maciej

AU - Hoekstra, Henk

AU - Chisari, Nora Elisa

AU - Georgiou, Christos

AU - Kannawadi, Arun

AU - Kuijken, Koen

AU - Wright, Angus H.

PY - 2018/11/6

Y1 - 2018/11/6

N2 - We use the overlap between multiband photometry of the Kilo-Degree Survey (KiDS) and spectroscopic data based on the Sloan Digital Sky Survey (SDSS) and Galaxy And Mass Assembly (GAMA) 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.

AB - We use the overlap between multiband photometry of the Kilo-Degree Survey (KiDS) and spectroscopic data based on the Sloan Digital Sky Survey (SDSS) and Galaxy And Mass Assembly (GAMA) 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.

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BT - Luminous red galaxies in the Kilo Degree Survey

PB - arXiv

ER -

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

Abstract

Keywords

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