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Astrophysics > Astrophysics of Galaxies
Title: Unraveling the collision scenario of the dissociative galaxy cluster Abell 56 through hydrodynamic simulations
(Submitted on 26 Jan 2024 (v1), last revised 19 Apr 2024 (this version, v3))
Abstract: In galaxy cluster collisions, the gas can be separated from dark matter halos. Abell~56 displays signatures of a dissociative bullet-like merger with a possible high inclination angle between the plane of orbit and the sky. Our objective is to provide a comprehensive description of the features observed in the collision scenario of Abell~56. Additionally, we aim to apply a potential weak lensing mass bias correction attributed to the merger to evaluate its impact on our findings. To investigate this, we perform tailored hydrodynamical $N$-body simulations, varying the impact parameter. We initially identified an early scenario at $0.12$\,Gyr after the central passage that reproduces some observational features. However, the mean temperature of $9.7$\,keV exceeded the observed value. Our best model corresponds to the late scenario at $0.52$\,Gyr after the pericenter, reproducing observed features of Abell~56, with an inclination of $58^\circ$. These features include the offset of $103$\,kpc between the main gas density peak and the south dark matter density peak, gas morphology, a line of sight relative velocity of $184$\,km\,s$^{-1}$, and a mean temperature of $6.7$\,keV. This late model provides a plausible scenario to describe the dynamics of Abell~56. The weak lensing mass bias did not significantly impact the overall dynamics of this cluster merger.
Submission history
From: Richards Albuquerque R. Albuquerque [view email][v1] Fri, 26 Jan 2024 18:14:50 GMT (633kb,D)
[v2] Mon, 8 Apr 2024 15:02:11 GMT (3047kb,D)
[v3] Fri, 19 Apr 2024 20:29:06 GMT (3047kb,D)
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