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arXiv 1004.4660astro-ph.CO
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Abell 1703的全透镜分析:独立透镜建模技术的比较

Full Lensing Analysis of Abell 1703: Comparison of Independent Lens-Modelling Techniques

Adi Zitrin, Tom Broadhurst, Keiichi Umetsu, Yoel Rephaeli, Elinor Medezinski, Larry Bradley, Yolanda Jiménez-Teja, Narciso Benítez, Holland Ford, Jori Liesenbor… 展开作者

Adi Zitrin, Tom Broadhurst, Keiichi Umetsu, Yoel Rephaeli, Elinor Medezinski, Larry Bradley, Yolanda Jiménez-Teja, Narciso Benítez, Holland Ford, Jori Liesenborgs, Sven De Rijcke, Herwig Dejonghe, Philippe Bekaert

摘要:

用两种不同的强透镜技术对弛豫星系团Abell 1703的内部质量分布进行了分析。我们的参数化方法具有再现多组多个图像所需的精度,基于质量近似跟踪光的假设。我们测试这个假设与一个完全非参数,自适应网格方法,没有知识的星系分布。由于成员星系必须包括在设计用于搜索透镜图像的模型中,因此在精细尺度上可以看到方法之间的差异,但在较大尺度上,暗物质的一般分布非常一致,具有非常相似的径向质量分布。我们从深多色斯巴鲁成像中添加未稀释的弱透镜测量,以获得完全独立于模型的质量分布,直至维里半径及更远。在弱透镜和强透镜之间的重叠区域中发现一致性,并且完整的质量分布由浓度参数$c_{\rm vir}\simeq 7.15\pm0.5$(和$M_{vir}\simeq 1.22\pm0.15 \times 10^{15}M_{\odot}/h$)的NFW模型很好地描述。Abell 1703位于标准$c$ -$M$关系之上,该关系是为标准$Λ$ CDM模型预测的,类似于具有精确确定的基于透镜的轮廓的其他大质量弛豫星系团。

英文摘要:

The inner mass-profile of the relaxed cluster Abell 1703 is analysed by two very different strong-lensing techniques applied to deep ACS and WFC3 imaging. Our parametric method has the accuracy required to reproduce the many sets of multiple images, based on the assumption that mass approximately traces light. We test this assumption with a fully non-parametric, adaptive grid method, with no knowledge of the galaxy distribution. Differences between the methods are seen on fine scales due to member galaxies which must be included in models designed to search for lensed images, but on the larger scale the general distribution of dark matter is in good agreement, with very similar radial mass profiles. We add undiluted weak-lensing measurements from deep multi-colour Subaru imaging to obtain a fully model-independent mass profile out to the virial radius and beyond. Consistency is found in the region of overlap between the weak and strong lensing, and the full mass profile is well-described by an NFW model of a concentration parameter, $c_{\rm vir}\simeq 7.15\pm0.5$ (and $M_{vir}\simeq 1.22\pm0.15 \times 10^{15}M_{\odot}/h$). Abell 1703 lies above the standard $c$--$M$ relation predicted for the standard $Λ$CDM model, similar to other massive relaxed clusters with accurately determined lensing-based profiles.

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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