ELUCID. IX. Recovering the Substructures and History of the Coma Cluster
Abstract
We employ constrained hydrodynamic simulations of the Coma galaxy cluster from the ELUCID project to study its substructures and assembly history. Our simulations accurately reproduce the global properties of Coma, including its position, virial mass, radius, and surrounding large-scale filaments. Using a combined HBT+SKID method, we obtain a total intracluster light (ICL) fraction of 12.2%−23.5%, consistent with recent observations. The mass-weighted ICL profiles of velocity dispersion, stellar age, and iron abundance generally agree with MaNGA measurements, and its clumpy east-west elongation is closely linked to the merger history of the two brightest cluster galaxies (BCGs). The simulation also successfully reproduces the north and west intracluster filaments (ICFs) detected by weak lensing, and the surrounding galaxy groups are distributed in alignment with the directions toward the nearby A2199 and A1367 clusters. The simulation further predict a complex cluster assembly history, with two major mergers at z=0.74 and $0.45$, and a pericentric passage of the two BCGs occurring ∼ 0.64 Gyr before its current state. Our results demonstrate that constrained simulations are a powerful tool for connecting observed structures to the unobservable assembly histories of individual galaxy clusters.
Related
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- The HERON Coma Project: Exploring the low-surface-brightness frontiers in the Coma cluster
- An Unusually Clumpy Ultra-Diffuse Galaxy in the Coma Cluster: A Missing Link for Globular Cluster Formation?
- Planck Constraints on Turbulence in the Coma Cluster
- Exploring the dynamics of the Coma galaxy cluster by mapping its X-ray emission line profiles with XRISM
BibTeX
@misc{luo2026elucid,
title = {{ELUCID. IX. Recovering the Substructures and History of the Coma Cluster}},
author = {Xiong Luo and Huiyuan Wang and Weiguang Cui and Yipeng Jing and Weipeng Lin and Neal Katz and Romeel Davé and Houjun Mo and Xiaohu Yang and Hao Li},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.20442},
eprint = {2609.20442},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.20442},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - ELUCID. IX. Recovering the Substructures and History of the Coma Cluster
AU - Xiong Luo
AU - Huiyuan Wang
AU - Weiguang Cui
AU - Yipeng Jing
AU - Weipeng Lin
AU - Neal Katz
AU - Romeel Davé
AU - Houjun Mo
AU - Xiaohu Yang
AU - Hao Li
PY - 2026
DA - 2026/09/20
PB - arXiv
DO - 10.48550/arxiv.2609.20442
UR - https://arxiv.org/abs/2609.20442
AB - We employ constrained hydrodynamic simulations of the Coma galaxy cluster from the ELUCID project to study its substructures and assembly history. Our simulations accurately reproduce the global properties of Coma, including its position, virial mass, radius, and surrounding large-scale filaments. Using a combined HBT+SKID method, we obtain a total intracluster light (ICL) fraction of 12.2%−23.5%, consistent with recent observations. The mass-weighted ICL profiles of velocity dispersion, stellar age, and iron abundance generally agree with MaNGA measurements, and its clumpy east-west elongation is closely linked to the merger history of the two brightest cluster galaxies (BCGs). The simulation also successfully reproduces the north and west intracluster filaments (ICFs) detected by weak lensing, and the surrounding galaxy groups are distributed in alignment with the directions toward the nearby A2199 and A1367 clusters. The simulation further predict a complex cluster assembly history, with two major mergers at z=0.74 and $0.45$, and a pericentric passage of the two BCGs occurring ∼ 0.64 Gyr before its current state. Our results demonstrate that constrained simulations are a powerful tool for connecting observed structures to the unobservable assembly histories of individual galaxy clusters.
ER -