Dark matter dynamics in Abell 3827: New data consistent with standard cold dark matter
Dark matter dynamics in Abell 3827: New data consistent with standard cold dark matter
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DOI：
10.1093/mnras/sty630
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发表时间：
2017-08
影响因子：
4.8
通讯作者：
R. Massey;D. Harvey;J. Liesenborgs;J. Richard;S. Stach;M. Swinbank;P. Taylor;L. Williams;D. Clowe;F. Courbin;A. Edge;H. Israel;M. Jauzac;R. Joseph;E. Jullo;T. Kitching;A. Leonard;J. Merten;D. Nagai;J. Nightingale;A. Robertson;L. J. Romualdez;P. Saha;R. Smit;S. Tam;E. Tittley
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文献类型：
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作者：
R. Massey;D. Harvey;J. Liesenborgs;J. Richard;S. Stach;M. Swinbank;P. Taylor;L. Williams;D. Clowe;F. Courbin;A. Edge;H. Israel;M. Jauzac;R. Joseph;E. Jullo;T. Kitching;A. Leonard;J. Merten;D. Nagai;J. Nightingale;A. Robertson;L. J. Romualdez;P. Saha;R. Smit;S. Tam;E. Tittley
利用阿塔卡马大型毫米波阵（阿尔马）和甚大望远镜/多单元光谱探测器对阿贝尔3827星系团进行了积分场光谱研究。它揭示了星团核心中强引力透镜的不寻常配置，其中至少有七个背景螺旋星系的透镜图像。基于哈勃太空望远镜成像的透镜模型表明，与星团中央星系之一相关的暗物质可能被抵消。新的光谱数据能够更好地减去前景光，并更好地识别多个背景图像。暗物质的推断分布与以星系为中心一致，正如Λ冷暗物质的预期。每个星系的暗物质似乎也是对称的。虽然，我们没有发现质量和光之间的偏移（暗示自相互作用的暗物质），如以前报道的，已经执行的数值模拟校准阿贝尔3827表明，偏移和不对称性仍然值得寻找在特定的几何碰撞。同时，阿尔马证明非常有用的强透镜图像识别。
We present integral field spectroscopy of galaxy cluster Abell 3827, using Atacama Large Millimetre Array (ALMA) and Very Large Telescope/Multi-Unit Spectroscopic Explorer. It reveals an unusual configuration of strong gravitational lensing in the cluster core, with at least seven lensed images of a single background spiral galaxy. Lens modelling based on Hubble Space Telescope imaging had suggested that the dark matter associated with one of the cluster's central galaxies may be offset. The new spectroscopic data enable better subtraction of foreground light, and better identification of multiple background images. The inferred distribution of dark matter is consistent with being centred on the galaxies, as expected by Λ cold dark matter. Each galaxy's dark matter also appears to be symmetric. Whilst, we do not find an offset between mass and light (suggestive of self-interacting dark matter) as previously reported, the numerical simulations that have been performed to calibrate Abell 3827 indicate that offsets and asymmetry are still worth looking for in collisions with particular geometries. Meanwhile, ALMA proves exceptionally useful for strong lens image identifications.