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

We constrain the luminosity and redshift dependence of intrinsic alignment (IA) a nearly volume-limited sample luminous red galaxies selected from fourth public data release Kilo-Degree Survey (KiDS-1000). To measure shapes galaxies, we used two complementary algorithms, finding consistent IA measurements for overlapping galaxy sample. The global significance detection across our independent samples, with favoured method shape estimation, is ∼10.7 σ . find no significant signal in range 0.2 < z 0.8, nor below L r ≲ 2.9 × 10 h −2 , ⊙ Above this luminosity, however, that increases as power law, although results are also compatible linear growth within current uncertainties. This behaviour motivates use broken law model when accounting contamination cosmic shear studies.