Euclid: Early Release Observations -- The intracluster light and intracluster globular clusters of the Perseus cluster

Intracluster medium
DOI: 10.48550/arxiv.2405.13503 Publication Date: 2024-05-22
AUTHORS (188)
ABSTRACT
We study the intracluster light (ICL) and globular clusters (ICGCs) in nearby Perseus galaxy cluster using Euclid's EROs. By modelling isophotal iso-density contours, we map distributions properties of ICL ICGCs out to a radius 600 kpc (~1/3 virial radius) from brightest (BCG). find that central 500 hosts 70000$\pm$2800 GCs $1.6\times10^{12}$ L$_\odot$ diffuse BCG+ICL near-infrared H$_E$. This accounts for 37$\pm$6% cluster's total stellar luminosity within this radius. The share coherent spatial distribution, suggesting common origin or potential governs their distribution. Their contours on largest scales (>200 kpc) are offset BCG's core westwards by 60 towards several luminous galaxies. is opposite displacement observed gaseous medium. radial surface brightness profile best described double S\'ersic model, with 68$\pm$4% H$_E$ extended, outer component. transition between these components occurs at ~50 kpc, beyond which isophotes become increasingly elliptical off-centred. ICGC number density closely follows only 50 radius, where an average per $10^9$ M$_\odot$ mass. colour becomes blue consistent populations having subsolar metallicities [Fe/H]~-0.6. ICL, specific frequency function suggest ICL+ICGCs were tidally stripped outskirts massive satellites masses few $\times10^{10}$ M$_\odot$, increasing contribution dwarf galaxies large radii.
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