Abell 3827中未对准爱因斯坦环对暗物质的几何支持
Geometric Support for Dark Matter by an Unaligned Einstein Ring in Abell 3827
摘要：
在越来越严格的实验室研究中，没有发现暗物质（DM）粒子，这鼓励了另一种引力理论，即引力只来自可见物质。在这里，我们考虑这样的理论是否可以通过引力透镜提出的二维测试-在星系团阿贝尔3827的核心再现一个特别详细的爱因斯坦环。我们发现，当我们要求透镜质量分布严格遵循形状（椭圆率和位置角）的光分布的星系团成员星系，星系团内的恒星，和X射线发射的星系团内的介质，我们不能重现爱因斯坦环，尽管允许这些可见组件的质光比随半径自由变化，以模仿替代引力理论。或者，我们表明，爱因斯坦环的详细功能是准确地再现，允许一个光滑的，自由取向的DM晕在透镜模型中，与相对较小的贡献，从可见光组件在一个水平上与他们观察到的亮度一致。这个主要的DM分量被限制为与来自星团内恒星的光具有相同的方向，这表明星团内恒星追踪这个分量的引力势。因此，阿贝尔3827的爱因斯坦环对其他引力理论提出了新的挑战：这些理论不仅必须在总的透镜质量和可见质量之间找到一致性，而且还必须在透镜质量的投影天空分布和可见物质之间找到一致性，这是一个比迄今为止透镜数据所提出的更严格的测试。
英文摘要：
The non-detection of dark matter (DM) particles in increasingly stringent laboratory searches has encouraged alternative gravity theories where gravity is sourced only from visible matter. Here, we consider whether such theories can pass a two-dimensional test posed by gravitational lensing -- to reproduce a particularly detailed Einstein ring in the core of the galaxy cluster Abell 3827. We find that when we require the lensing mass distribution to strictly follow the shape (ellipticity and position angle) of the light distribution of cluster member galaxies, intracluster stars, and the X-ray emitting intracluster medium, we cannot reproduce the Einstein ring, despite allowing the mass-to-light ratios of these visible components to freely vary with radius to mimic alternative gravity theories. Alternatively, we show that the detailed features of the Einstein ring are accurately reproduced by allowing a smooth, freely oriented DM halo in the lens model, with relatively small contributions from the visible components at a level consistent with their observed brightnesses. This dominant DM component is constrained to have the same orientation as the light from the intracluster stars, indicating that the intracluster stars trace the gravitational potential of this component. The Einstein ring of Abell 3827 therefore presents a new challenge for alternative gravity theories: not only must such theories find agreement between the total lensing mass and visible mass, but they must also find agreement between the projected sky distribution of the lensing mass and that of the visible matter, a more stringent test than has hitherto been posed by lensing data.
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