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arXiv 1808.09449astro-ph.GA
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Abell 2034星系团的新发现

New insights on the dissociative merging galaxy cluster Abell 2034

R. Monteiro-Oliveira, E. S. Cypriano, A. Z. Vitorelli, A. L. B. Ribeiro, L. Sodré, R. Dupke, C. Mendes de Oliveira

摘要:

基于弱透镜效应和动力学分析,我们提出了关于合并星系团Abell 2034($\bar{z}=0.114$)的新见解.从我们的深斯巴鲁$BR_Cz'$图像加上Gemini-GMOS/N低分辨率光谱伴随着可用的红移数据,我们已经获得了碰撞子团的个体质量,以及估计的时间轴的过程。碰撞事件发生在$0.56^{+0.15}_{-0.22}$ Gyr前,发生在子星系团A2034 S($M_{200}^S=2.35_{-0.99}^{+0.84}\times 10^{14}$ M $_{\odot}$)和A2034 N($M_{200}^N=1.08_{-0.71}^{+0.51}\times 10^{14}$ M $_{\odot}$)之间,两个子星系团的气体含量相对于它们的星系和暗物质分布发生了位移,情况与子弹星系团中发现的情况类似。根据我们的数据和模型,碰撞事件很可能发生在离天空平面不远的地方,与之成$27^\circ\pm14^\circ$角。尽管该系统固有的内在简并性(无论是观测到的入射还是出射),我们计算的时间与观测到的X射线冲击波阵面的估计年龄以及星系团成员的速度色散所经历的增量的最接近近似值的比较指向出射运动。此外,我们发现了一个强有力的证据,我们称之为A2034 W的第三种结构的存在。

英文摘要:

We present here new insights about the merging galaxy cluster Abell 2034 ($\bar{z}=0.114$) based on a combined weak lensing and dynamical analysis. From our deep Subaru $BR_Cz'$ images plus Gemini-GMOS/N low-resolution spectra accompanied by available redshift data, we have obtained the individual masses of the colliding subclusters as well as estimated a timeline of the process. The collision event happened $0.56^{+0.15}_{-0.22}$ Gyr ago between the subclusters A2034S ($M_{200}^S=2.35_{-0.99}^{+0.84}\times 10^{14}$ M$_{\odot}$) and A2034N ($M_{200}^N=1.08_{-0.71}^{+0.51}\times 10^{14}$ M$_{\odot}$) with the gas content of both subclusters displaced in relation to their galaxy and dark matter distributions, in a scenario similar to that found in the Bullet Cluster. Following our data and modelling the collision event is, most likely, taking place not so far from the plane of the sky, with an angle of $27^\circ\pm14^\circ$ in relation to that. In spite of the intrinsic degeneracy inherent to the system (whether it has been observed incoming or outgoing), the comparison of our calculated time since the closest approximation with the estimated age of the observed X-ray shock front and the increment experienced by the velocity dispersion of the galaxy cluster members points toward an outgoing movement. Besides, we found a strong evidence for the presence of a third structure which we called A2034W.

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