TY - JOUR
T1 - KiDS-1000
T2 - Constraints on the intrinsic alignment of luminous red galaxies
AU - Fortuna, Maria Cristina
AU - Hoekstra, Henk
AU - Johnston, Harry
AU - Vakili, Mohammadjavad
AU - Kannawadi, Arun
AU - Georgiou, Christos
AU - Joachimi, Benjamin
AU - Wright, Angus H.
AU - Asgari, Marika
AU - Bilicki, Maciej
AU - Heymans, Catherine
AU - Hildebrandt, Hendrik
AU - Kuijken, Konrad
AU - Wietersheim-Kramsta, Maximilian Von
N1 - 21 pages, 14 figures. Accepted for publication in A&A
PY - 2021/10/15
Y1 - 2021/10/15
N2 - 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.
AB - 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.
KW - ravitational lensing: weak
KW - cosmology: observations
KW - large-scale structure of Universe
U2 - 10.1051/0004-6361/202140706
DO - 10.1051/0004-6361/202140706
M3 - Article
SN - 0004-6361
VL - 654
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
M1 - A76
ER -