暗物质晕对宇宙微波背景的引力透镜效应的证据。
Evidence of lensing of the cosmic microwave background by dark matter halos.
机构信息
Physics and Astronomy Department, Stony Brook University, Stony Brook, New York 11794, USA.
Sub-Department of Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, United Kingdom.
出版信息
Phys Rev Lett. 2015 Apr 17;114(15):151302. doi: 10.1103/PhysRevLett.114.151302. Epub 2015 Apr 13.
We present evidence of the gravitational lensing of the cosmic microwave background by 10(13) solar mass dark matter halos. Lensing convergence maps from the Atacama Cosmology Telescope Polarimeter (ACTPol) are stacked at the positions of around 12 000 optically selected CMASS galaxies from the SDSS-III/BOSS survey. The mean lensing signal is consistent with simulated dark matter halo profiles and is favored over a null signal at 3.2σ significance. This result demonstrates the potential of microwave background lensing to probe the dark matter distribution in galaxy group and galaxy cluster halos.
我们提供了由 10(13)个太阳质量暗物质晕的引力透镜作用产生的宇宙微波背景的证据。阿塔卡马宇宙学望远镜极化仪（ACTPol）的透镜汇聚图在 SDSS-III/BOSS 调查中约 12000 个光学选择的 CMASS 星系的位置上进行了堆叠。平均透镜信号与模拟的暗物质晕轮廓一致，并且比零信号更受青睐，置信度为 3.2σ。这一结果证明了微波背景透镜在探测星系团和星系团晕的暗物质分布方面的潜力。
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