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

Maria Cristina FortunaLeiden Observatory, Leiden University, PO Box 9513, Leiden 2300 RA, The NetherlandsHenk HoekstraLeiden Observatory, Leiden University, PO Box 9513, Leiden 2300 RA, The NetherlandsHarry JohnstonInstitute for Theoretical Physics, Utrecht University, Princetonplein 5, 3584 CE Utrecht, The NetherlandsMohammadjavad VakiliLeiden Observatory, Leiden University, PO Box 9513, Leiden 2300 RA, The NetherlandsArun KannawadiDepartment of Astrophysical Sciences, Princeton University, 4 Ivy Lane, Princeton, NJ 08544, USAChristos GeorgiouLeiden Observatory, Leiden University, PO Box 9513, Leiden 2300 RA, The NetherlandsB. JoachimiDepartment of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UKAngus H. WrightRuhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing, 44780 Bochum, GermanyMarika AsgariInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UKMaciej BilickiCenter for Theoretical Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, PolandCatherine HeymansInstitute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UKH. HildebrandtRuhr University Bochum, Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), German Centre for Cosmological Lensing, 44780 Bochum, GermanyKonrad KuijkenLeiden Observatory, Leiden University, PO Box 9513, Leiden 2300 RA, The NetherlandsMaximilian von Wietersheim-KramstaDepartment of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, UK

2021en

ABI

Annotatsiya

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 ∼10.7 σ . 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 L r ≲ 2.9 × 10 10 h −2 L r , ⊙ . 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.

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DOI: 10.1051/0004-6361/202140706

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