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Astrophysics > Astrophysics of Galaxies
Title: Weak-lensing mass bias in the dissociative galaxy cluster Abell 56
(Submitted on 26 Jan 2024 (this version), latest version 19 Apr 2024 (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 $9.8$ keV exceeded the observed value. Despite applying a mass bias correction due to the merger process, the new mean temperature of $8.4$ keV remained higher than 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 between the main gas density peak and the south dark matter density peak of $103$ kpc, gas morphology, a line of sight relative velocity of $184$ km s$^{-1}$, and a mean temperature of $6.7$ keV. In the Abell $56$ collision scenario, the weak lensing mass bias did not significantly impact the overall dynamics of the cluster merger. The correction only resulted in a slight decrease in the final mean temperature.
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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