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Exploring Formation and Expansion of the Ancient Cold Front in the Perseus Galaxy Cluster

Presentation #103.04 in the session Galaxy Clusters/Large Scale Structures - Poster Session.

Published onMay 03, 2024
Exploring Formation and Expansion of the Ancient Cold Front in the Perseus Galaxy Cluster

The intracluster medium of the Perseus Cluster exhibits spiral-shaped X-ray surface brightness discontinuities known as cold fronts, which serve as valuable probes of the physical processes within the hot gas and the merger history of galaxy clusters. Simulations indicate that these features emerge from the sloshing motion of the gas following the passage of a subcluster. Recent Perseus observations reveal the extension of these cold fronts to considerably large radii, out to at least half the virial radius and possibly further, raising the question of what sort of merger event could produce such structures. We present simulations of binary cluster mergers using the AREPO magnetohydrodynamics code, exploring a range of initial conditions to determine which merger conditions can generate and sustain a cold front capable of propagating to large radii. Our results demonstrate how the different parameters affect various aspects of the cold fronts, including the time it takes for the first fronts formed to reach large radii, the number and positions of the fronts, and constraints on the possible position and trajectory of the subcluster, an important issue since in many sloshing cold front clusters-including Perseus-the identity of the subcluster is not readily apparent and no identifiable structure is visible in the X-ray observations.

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