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arXiv 0901.0344astro-ph.GA
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引力透镜的微扰重建:当质量不随光时

Perturbative reconstruction of a gravitational lens: when mass does not follow light

C. Alard

摘要:

利用Alard 2007,MNRAS,382 L,58; Alard 2008,MNRAS,388,375中提出的微扰方法重建了复杂引力透镜的结构和势。这个透镜由属于一个小星系群的6个星系组成。透镜反演被简化为重建非简并量的问题:强引力透镜微扰理论的两个场。由于在微扰理论中,圆源解是解析的,因此微扰解的一般性质可以直接从数据中推断出来。因此,微扰场的重建不受简并性的影响,并且找到最佳解只是一个数值精化的问题。从微扰解中推导出了透镜的势和密度的局部形状,揭示了不跟随光的独立暗分量的存在。最可能的解释是,暗晕的特殊形状是由于冷暗物质晕的合并。这是在星系尺度上研究暗晕结构的一个新结果。

英文摘要:

The structure and potential of a complex gravitational lens is reconstructed using the perturbative method presented in Alard 2007, MNRAS, 382L, 58; Alard 2008, MNRAS, 388, 375. This lens is composed of 6 galaxies belonging to a small group. The lens inversion is reduced to the problem of reconstructing non-degenerate quantities: the 2 fields of the perturbative theory of strong gravitational lenses. Since in the perturbative theory the circular source solution is analytical, the general properties of the perturbative solution can be inferred directly from the data. As a consequence, the reconstruction of the perturbative fields is not affected by degeneracy, and finding the best solution is only a matter of numerical refinement. The local shape of the potential and density of the lens are inferred from the perturbative solution, revealing the existence of an independent dark component that does not follow light. The most likely explanation is that the particular shape of the dark halo is due to the merging of cold dark matter halos. This is a new result illustrating the structure of dark halos at the scale of galaxies.

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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