PIRSA:26020037 Scientific Series Cosmology

DOI10.48660/26020037

Series: Cosmology and Gravitation

Ahad, S.L. (2026). Tracing the mass distribution and assembly of galaxy clusters with ICL and dynamical indicators. Perimeter Institute. https://pirsa.org/26020037

Ahad, Syeda Lammim. Tracing the mass distribution and assembly of galaxy clusters with ICL and dynamical indicators. Perimeter Institute, Feb. 03, 2026, https://pirsa.org/26020037 

@misc{ pirsa_PIRSA:26020037,
  doi = {10.48660/26020037},
  url = {https://pirsa.org/26020037},
  author = {Ahad, Syeda Lammim},
  keywords = {Cosmology},
  language = {en},
  title = {Tracing the mass distribution and assembly of galaxy clusters with ICL and dynamical indicators},
  publisher = {Perimeter Institute},
  year = {2026},
  month = {feb},
  note = {PIRSA:26020037 see, \url{https://pirsa.org}}
}

Abstract

Galaxy clusters assemble hierarchically, and their present-day dynamical state encodes information about cluster formation timescales and mass distribution. The diffuse intracluster light (ICL), a fossil record of tidal stripping and accretion, offers a complementary probe that is sensitive to a cluster’s assembly history. In this talk I will present recent works based on photometric surveys (Euclid, UNIONS, DESI Legacy, KiDS) and cosmological hydrodynamic simulations (e.g. IllustrisTNG, Hydrangea), addressing two questions: (i) how observational tracers (e.g. magnitude gaps, galaxy-stellar-mass ratios) can be used to identify cluster dynamical state and its imprint on cluster properties; and (ii) what the ICL fraction and morphology reveal about the underlying mass and the stage of assembly. If time allows, I will briefly describe ongoing work with the FLAMINGO simulations that connects high-redshift protoclusters to their descendant clusters using observational indicators of environment and assembly.

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