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arXiv 1005.3295astro-ph.CO
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Abell~222和Abell~223星系团的多波长观测

The clusters Abell~222 and Abell~223: a multi-wavelength view

F. Durret, T. F. Laganá, C. Adami, E. Bertin

摘要:

Abell 222和223星系团位于平均红移z ~ 0.21处,相距0.26度。以前在这些星系团中已经发现了合并的迹象,无论是在X射线还是在光波长,从而激发了我们的研究。在X射线中,它们相对明亮,阿贝尔223显示出双重结构。在光学和X射线波长下,在星团之间也检测到了灯丝。我们分析了这两个星系团的光学性质的基础上,在两个波段的深度成像,推导出它们的星系微小度函数(GLF),并将这些属性与来自XMM-牛顿数据的X射线特征。Abell 222在g'和r'波段中的GLF通过Schechter函数很好地拟合; GLF在r'中比在g'中更陡。对于Abell 223,两个波段的GLF都需要一个亮幅值的第二分量,并添加到Schechter函数中;它们在两个波段中是相似的。Serna & Gerbal方法可以很好地分离两个簇。在星系团周围的大尺度上没有发现明显的星系结构,但第三个红移相同的星系团Abell 209位于投影距离19.2 Mpc处。X射线温度和金属丰度图显示,在Abell 222中,X射线气体的温度和金属丰度相当均匀,而在Abell 223中,它们非常扰动。Abell 222/Abell 223系统是复杂的。形成这种结构的两个团簇呈现出非常不同的动力学状态。在光学数据中也检测到最近相互作用的迹象,其中该集群显示了"扰动“GLF。总之,Abell 222和Abell 223的多波长分析被用来研究相互作用系统中ICM和星系团性质之间的联系。

英文摘要:

(Abstract abridged) The Abell 222 and 223 clusters are located at an average redshift z ~ 0.21 and are separated by 0.26 deg. Signatures of mergers have been previously found in these clusters, both in X-rays and at opticalwavelengths, thus motivating our study. In X-rays, they are relatively bright, and Abell 223 shows a double structure. A filament has also been detected between the clusters both at optical and X-ray wavelengths. We analyse the optical properties of these two clusters based on deep imaging in two bands, derive their galaxy minosity functions (GLFs) and correlate these properties with X-ray characteristics derived from XMM-Newton data. The GLFs of Abell 222 in the g' and r' bands are well fit by a Schechter function; the GLF is steeper in r' than in g'. For Abell 223, the GLFs in both bands require a second component at bright magnitudes, added to a Schechter function; they are similar in both bands. The Serna & Gerbal method allows to separate well the two clusters. No obvious filamentary structures are detected at very large scales around the clusters, but a third cluster at the same redshift, Abell 209, is located at a projected distance of 19.2 Mpc. X-ray temperature and metallicity maps reveal that the temperature and metallicity of the X-ray gas are quite homogeneous in Abell 222, while they are very perturbed in Abell 223. The Abell 222/Abell 223 system is complex. The two clusters that form this structure present very different dynamical states. Signs of recent interactions are also detected in the optical data where this cluster shows a ``perturbed'' GLF. In summary, the multiwavelength analyses of Abell 222 and Abell 223 are used to investigate the connection between the ICM and the cluster galaxy properties in an interacting system.

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