Fortuna, MC;
Hoekstra, H;
Johnston, H;
Vakili, M;
Kannawadi, A;
Georgiou, C;
Joachimi, B;
... Von Wietersheim-Kramsta, M; + view all
(2021)
KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies.
Astronomy & Astrophysics
, 654
A76-A76.
10.1051/0004-6361/202140706.
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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.
| Type: | Article |
|---|---|
| Title: | KiDS-1000: Constraints on the intrinsic alignment of luminous red galaxies |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1051/0004-6361/202140706 |
| Publisher version: | https://doi.org/10.1051/0004-6361/202140706 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Gravitational lensing: weak / cosmology: observations / large-scale structure of Universe |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10137062 |
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