KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies

Fortuna, Maria Cristina; Hoekstra, Henk; Johnston, Harry; Vakili, Mohammadjavad; Kannawadi, Arun; Georgiou, Christos; Joachimi, Benjamin; Wright, Angus H.; Asgari, Marika; Bilicki, Maciej; Heymans, Catherine; Hildebrandt, Hendrik; Kuijken, Konrad; Von Wietersheim-Kramsta, Maximilian

Abstract

We constrain the luminosity and redshift dependence of the intrinsic alignment (IA) of a nearly volume-limited sample of luminous red galaxies selected from the fourth public data release of the Kilo-Degree Survey (KiDS-1000). To measure the shapes of the galaxies, we used two complementary algorithms, finding consistent IA measurements for the overlapping galaxy sample. The global significance of IA detection across our two independent luminous red galaxy samples, with our favoured method of shape estimation, is ∼10.7σ. We find no significant dependence with redshift of the IA signal in the range 0.2  <  z  <  0.8, nor a dependence with luminosity below Lr ≲  2.9  ×  1010  h-2Lr, ⊙ . Above this luminosity, however, we find that the IA signal increases as a power law, although our results are also compatible with linear growth within the current uncertainties. This behaviour motivates the use of a broken power law model when accounting for the luminosity dependence of IA contamination in cosmic shear studies.

Citation

Fortuna, M. C., Hoekstra, H., Johnston, H., Vakili, M., Kannawadi, A., Georgiou, C., Joachimi, B., Wright, A. H., Asgari, M., Bilicki, M., Heymans, C., Hildebrandt, H., Kuijken, K., & Von Wietersheim-Kramsta, M. (2021). KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies. Astronomy and Astrophysics, 654, Article A76. https://doi.org/10.1051/0004-6361/202140706

• Journal Article Type: Article
• Acceptance Date: Aug 4, 2021
• Online Publication Date: Oct 15, 2021
• Publication Date: Oct 1, 2021
• Deposit Date: Jan 9, 2025
• Publicly Available Date: Jan 13, 2025
• Journal: Astronomy and Astrophysics
• Print ISSN: 0004-6361
• Publisher: EDP Sciences
• Peer Reviewed: Peer Reviewed
• Volume: 654
• Article Number: A76
• DOI: https://doi.org/10.1051/0004-6361/202140706
• Keywords: gravitational lensing: weak / cosmology: observations / large-scale structure of Universe
• Public URL: https://hull-repository.worktribe.com/output/3965002