KiDS-1000: Weak lensing and intrinsic alignment around luminous red galaxies

We study the properties of luminous red galaxies (LRGs) selected from the fourth data release of the Kilo Degree Survey (KiDS-1000) via galaxy-galaxy lensing of the background galaxies from KiDS-1000. We used a halo model formalism to interpret our measurements and obtain estimates of the halo masses as well as the satellite fractions of the LRGs, resulting in halo masses of 2.7 × 10 12 h −1 M ⊙ < M h < 2.6 × 10 13 h −1 M ⊙ . We studied the strength of intrinsic alignments (IA) using the position-shape correlations as a function of LRG luminosity, where we used a double power law to describe the relation between luminosity and halo mass to allow for a comparison with previous works. Here, we directly linked the observed IA of the (central) galaxy to the mass of the hosting halo, which is expected to be a fundamental quantity in establishing the alignment. We find that the dependence of the IA amplitude on halo mass is described well by a single power law, with an amplitude of A = 5.74 ± 0.32 and slope of β M = 0.44 ± 0.04, in the range of 1.9 × 10 12 h −1 M ⊙ < M h < 3.7 × 10 14 h −1 M ⊙ . We also find that both red and blue galaxies from the source sample associated with the LRGs are randomly oriented, with respect to the LRGs, although our detection significance is limited by the uncertainty in our photometric redshifts.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-02-01
DOI
https://doi.org/10.1051/0004-6361/202452347
Citations
7
Primary Topic
Statistics Education and Methodologies
Type
article
Field-Weighted Citation Impact
18.41

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article

KiDS-1000: Weak lensing and intrinsic alignment around luminous red galaxies

Catherine Heymans, Angus H. Wright, Maciej Bilicki, H. Hildebrandt et al.
7 citations
Astronomy and Astrophysics
Statistics Education and Methodologies
18.41
article

KiDS-1000: Weak lensing and intrinsic alignment around luminous red galaxies

Catherine Heymans, Angus H. Wright, Maciej Bilicki, H. Hildebrandt, Andrej Dvornik, Nora Elisa Chisari, Konrad H. Kuijken, Marika Asgari, Ji Yao, Maria Cristina Fortuna
article en
7 citations

Abstract

We study the properties of luminous red galaxies (LRGs) selected from the fourth data release of the Kilo Degree Survey (KiDS-1000) via galaxy-galaxy lensing of the background galaxies from KiDS-1000. We used a halo model formalism to interpret our measurements and obtain estimates of the halo masses as well as the satellite fractions of the LRGs, resulting in halo masses of 2.7 × 10 12 h −1 M ⊙ < M h < 2.6 × 10 13 h −1 M ⊙ . We studied the strength of intrinsic alignments (IA) using the position-shape correlations as a function of LRG luminosity, where we used a double power law to describe the relation between luminosity and halo mass to allow for a comparison with previous works. Here, we directly linked the observed IA of the (central) galaxy to the mass of the hosting halo, which is expected to be a fundamental quantity in establishing the alignment. We find that the dependence of the IA amplitude on halo mass is described well by a single power law, with an amplitude of A = 5.74 ± 0.32 and slope of β M = 0.44 ± 0.04, in the range of 1.9 × 10 12 h −1 M ⊙ < M h < 3.7 × 10 14 h −1 M ⊙ . We also find that both red and blue galaxies from the source sample associated with the LRGs are randomly oriented, with respect to the LRGs, although our detection significance is limited by the uncertainty in our photometric redshifts.

Astronomy and AstrophysicsVol. 694
Leiden University (NL), Utrecht University (NL), Shanghai Astronomical Observatory (CN), Center for Theoretical Physics (PL), Royal Observatory (GB), Newcastle University (GB), Ruhr University Bochum (DE), University of Edinburgh (GB), Polish Academy of Sciences (PL)
National Science Foundation, Alexander von Humboldt-Stiftung, Imperial College London, Indian Council of Agricultural Research, Deutsche Forschungsgemeinschaft, National Natural Science Foundation of China, Bundesministerium für Bildung und Forschung, China Postdoctoral Science Foundation, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Università degli Studi di Padova, Max-Planck-Gesellschaft, Science and Technology Facilities Council, INAF-Osservatorio Astronomico di Padova
Peace, Justice and strong institutions
Openalex Percentile: Top 1%
Statistics Education and Methodologies
18.41
DOIOpen Access PDFOpenAlex
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