爱因斯坦环中可见物质和暗物质的分离LBG J213512 .73-010143
Separation of the visible and dark matter in the Einstein ring LBG J213512.73-010143
摘要：
我们在最近发现的爱因斯坦环LBG J213512.73-010143（“宇宙之眼”）使用档案哈勃太空望远镜成像的质量分布模型。我们重建的质量密度分布的z=0.73透镜和表面亮度分布的z=3.07源，并发现所观察到的环是最好的拟合与重子Sersic组件嵌套在一个暗物质晕的双组件透镜模型。暗物质晕的内部斜率为1.42+/-0.23，与考虑重子收缩后的CDM模拟一致。重子分量在B波段的质光比为1.71+0.28-0.38（太阳单位），演化到今天与局部椭圆星系一致。在爱因斯坦半径为0.77“（5.6 kpc）的范围内，重子占透镜总质量的（46+/-11）%。该模型可以准确地预测来自附近前景集群的外部剪切。在源平面中的重建的表面亮度分布清楚地示出了两个峰值。通过我们的透镜反演方法的概括，我们得出结论，两个峰值的红移是相互一致的，这表明我们看到的是一个单一的星系内的结构。
英文摘要：
We model the mass distribution in the recently discovered Einstein ring LBG J213512.73-010143 (the `Cosmic Eye') using archival Hubble Space Telescope imaging. We reconstruct the mass density profile of the z=0.73 lens and the surface brightness distribution of the z=3.07 source and find that the observed ring is best fit with a dual-component lens model consisting of a baryonic Sersic component nested within a dark matter halo. The dark matter halo has an inner slope of 1.42+/-0.23, consistent with CDM simulations after allowing for baryon contraction. The baryonic component has a B-band mass-to-light ratio of 1.71+0.28-0.38 (solar units) which when evolved to the present day is in agreement with local ellipticals. Within the Einstein radius of 0.77'' (5.6 kpc), the baryons account for (46+/-11)% of the total lens mass. External shear from a nearby foreground cluster is accurately predicted by the model. The reconstructed surface brightness distribution in the source plane clearly shows two peaks. Through a generalisation of our lens inversion method, we conclude that the redshifts of both peaks are consistent with each other, suggesting that we are seeing structure within a single galaxy.
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