Oral Presentation

Spatial Distribution Study of Intracluster Light vs. Dark Matter using HR5

Author(s): Jaewon Yoo (KIAS), Changbom Park (KIAS), Cristiano Giovanni Sabiu (University of Seoul), Ankit Singh (KIAS), Céline Gouin (KIAS), Jongwan Ko (KASI), Jaehyun Lee (KIAS), Juhan Kim (KIAS), M. James Jee (Yonsei), Hyowon Kim (KASI)

Presenter: Jaewon Yoo (Korea Institute for Advanced Study)

In studying the dynamical evolution of galaxy clusters, one intriguing approach is to compare the spatial distributions of various components, such as dark matter (DM), the member galaxies, the gas, and the intracluster light (ICL). If we find the spatial distribution of ICL coincides with the DM distribution, with higher fidelity for more relaxed galaxy clusters, then the similarity of the distributions may be used as a dynamical stage estimator of the cluster. We developed a new methodology (named Weighted Overlap Coefficient; WOC) to quantify the similarity of two or more 2-dimensional spatial distributions (Yoo et al. 2022 ApJS, 261, 28). We apply the method to the 174 galaxy clusters (>5*10^13 M_sun, z=0.625) at different dynamical stages (defined using the virial ratio, formation time, substructure fraction and offset) simulated within HR5. Furthermore, we apply the method to additional samples at various redshifts and in various density environments (galaxy cluster/ group/ field), and investigate how the similarity in spatial distribution between ICL and DM evolves over cosmological timescales.