Oral Presentation

Weak lensing detection of galaxy clusters using redshift tomography in the framework of the Euclid mission

Author(s): Loris Chapuis, Sandrine Pires, Gabriel Pratt

Presenter: Loris Chappuis (CEA Paris Saclay)

The mass-redshift distribution of galaxy clusters is a well-known probe of the cosmology through the Halo Mass Function. Usually detected through their baryonic content (gas or galaxies), deriving the true population of galaxy clusters from the observed distribution requires an understand of the selection function. Detecting clusters through different observations, subject to different biases, allows a better understanding of the cluster population. Recently, multiple methods have emerged to detect galaxy clusters through their weak lensing signal. Although these methods lead to fewer detections than the detections through gas or galaxies, they offer a different selection, driven by the projected mass of the cluster rather than baryonic physics. Designed for weak lensing studies, Euclid will offer the possibility to build an unprecedented catalogue of weak lensing detected clusters. Relying on a multi-scale detection algorithm (Leroy et al. 2023), we explore the use of the tomographic information of the source galaxies, aiming at significantly increasing the number of detections while reducing the number of false associations.