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arXiv 2004.13660astro-ph.GAastro-ph.CO
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星系团Abell 1644中新发现的贫气体亚结构引起的气体晃动的模拟

Simulations of gas sloshing induced by a newly discovered gas poor substructure in galaxy cluster Abell 1644

L. Doubrawa, R. E. G. Machado, T. F. Laganá, G. B. Lima Neto, R. Monteiro-Oliveira, E. S. Cypriano

摘要:

碰撞事件导致星系团团内气体出现特殊的形态。Abell 1644似乎就是这种情况,它是附近的一个星系团,由三个主要结构组成:南部的星系团呈现出螺旋状的形态,A1644 S;在X射线观测中看到的北部星系团A1644 N1;以及最近发现的子结构A1644 N2。通过$N$ -体流体动力学模拟,我们试图重建该系统的动力学历史。这些模拟产生了两种特定的情景:(i)A1644 S和A1644 N2之间的碰撞。我们的最佳模型在合并平面和$30^\circ$的天空平面之间有一个倾角,并在中心附近通过后达到最佳形态$1.6\,$ Gyr。此时,A1644 N2是贫气体的,在X射线发射中几乎无法检测到。该模型与观测结果吻合较好;(ii)A1644 S和A1644 N1之间的碰撞。这种方法并没有产生像第一种情况那样令人满意的结果,因为密度和不匹配的温度图存在很大的干扰。作为补充研究,我们进行了一个三集群模拟作为基础的最佳拟合模型再现A1644的三个主要结构的当前状态。这种情况下提出了一个很好的协议,全球形态的观察。因此,我们发现更有可能的情况是A1644 S和新发现的A1644 N2之间的碰撞,只要A1644 N1不会严重干扰螺旋特征的形成,它就可能存在。

英文摘要:

Collision events lead to peculiar morphologies in the intracluster gas of galaxies clusters. That seems to be the case of Abell 1644, a nearby galaxy cluster, composed of three main structures: the southern cluster that exhibits a spiral-like morphology, A1644S; the northern cluster seen in X-ray observations, A1644N1; and the recently discovered substructure, A1644N2. By means of $N$-body hydrodynamical simulations, we attempt to reconstruct the dynamical history of this system. These simulations resulted in two specific scenarios: (i) The collision between A1644S and A1644N2. Our best model has an inclination between the merger plane and the plane of the sky of $30^\circ$, and reaches the best morphology $1.6\,$Gyr after the pericentric passage. At this instant A1644N2 is gas poor, becoming nearly undetectable in X-ray emission. This model shows a good agreement with observations; (ii) The collision between A1644S and A1644N1. This approach did not give rise to results as satisfactory as the first scenario, due to great disturbances in density and mismatching temperature maps. As a complementary study, we perform a three-cluster simulation using as base the best-fitting model to reproduce the current state of A1644 with the three main structures. This scenario presented a good agreement to the global morphology of the observations. Thus, we find that the more likely scenario is a collision between A1644S and the newly discovered A1644N2, where A1644N1 may be present as long as it does not greatly interfere in the formation of the spiral feature.

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