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arXiv 0909.3527astro-ph.CO
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透镜星系团Abell 611中半径30年以上的暗物质分布

The Distribution of Dark Matter Over 3 Decades in Radius in the Lensing Cluster Abell 611

A. B. Newman, T. Treu, R. S. Ellis, D. J. Sand, J. Richard, P. J. Marshall, P. Capak, S. Miyazaki

摘要:

我们提出了一个详细的分析的重子和暗物质分布在透镜集群阿贝尔611(z=0.288),确定暗物质配置文件在一个前所未有的范围内的集群为中心的距离的目标。通过结合三个互补的探测质量分布,弱透镜从深多色成像,强透镜约束的基础上识别的多个成像源,并解决了恒星速度色散措施的最亮的星系团(BCG),我们扩展的方法来分离的黑暗和重子质量分量介绍了由Sand等。(2008)。我们得到的暗物质配置文件样本的集群从3千秒差距到3.25百万秒差距,从而提供了一个很好的基础与最近的数值模型进行比较。我们证明,只有通过结合我们的三个观测技术可以简并约束的形式的暗物质配置文件被打破的尺度与数值模拟的详细比较至关重要。我们的分析表明,一个简单的Navarro,Frenk和White(NFW)配置文件是一个不可接受的适合我们的数据。我们证实了早期的说法,即暗物质轮廓的内部轮廓与NFW形式显着偏离,并发现内部对数斜率β比0.3更平坦(68%;其中rho_DM ~ r^{-β}在小半径处)。为了使我们的数据与LambdaCDM宇宙学中的团簇形成相一致,我们推测可能有必要修改我们对星系团核心中重子-暗物质相互作用性质的理解。综合弱和强透镜数据,再加上最亮的星系团的运动学信息,可以很容易地应用到一个更大的样本的集群,以测试这些结果的普遍性。

英文摘要:

We present a detailed analysis of the baryonic and dark matter distribution in the lensing cluster Abell 611 (z=0.288), with the goal of determining the dark matter profile over an unprecedented range of cluster-centric distance. By combining three complementary probes of the mass distribution, weak lensing from deep multi-color imaging, strong lensing constraints based on the identification of multiply-imaged sources, and resolved stellar velocity dispersion measures for the brightest cluster galaxy (BCG), we extend the methodology for separating the dark and baryonic mass components introduced by Sand et al. (2008). Our resulting dark matter profile samples the cluster from ~3 kpc to 3.25 Mpc, thereby providing an excellent basis for comparisons with recent numerical models. We demonstrate that only by combining our three observational techniques can degeneracies in constraining the form of the dark matter profile be broken on scales crucial for detailed comparisons with numerical simulations. Our analysis reveals that a simple Navarro, Frenk, and White (NFW) profile is an unacceptable fit to our data. We confirm earlier claims that the inner profile of the dark matter profile deviates significantly from the NFW form and find a inner logarithmic slope βflatter than 0.3 (68%; where rho_DM ~ r^{-β} at small radii). In order to reconcile our data with cluster formation in a LambdaCDM cosmology, we speculate that it may be necessary to revise our understanding of the nature of baryon--dark matter interactions in cluster cores. Comprehensive weak and strong lensing data, when coupled with kinematic information on the brightest cluster galaxy, can readily be applied to a larger sample of clusters to test the universality of these results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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