期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 440, 期 4, 页码 2922-2927出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu456
关键词
gravitational lensing: weak; cosmology: observations
资金
- US Department of Energy [DE- FG02-91ER40690, DE-AC02-98CH10886]
- NSF [AST-0908902, AST-0708849]
- ANR Chaire d'Excellence
- UPMC Chaire Internationale in Theoretical Cosmology
We report the first measurement of the diminutive lensing signal arising from matter under-densities associated with cosmic voids. While undetectable individually, by stacking the weak gravitational shear estimates around 901 voids detected in Sloan Digital Sky Survey DR7 by Sutter et al., we find substantial evidence for a depression of the lensing signal compared to the cosmic mean. This depression is most pronounced at the void radius, in agreement with analytical models of void matter profiles. Even with the largest void sample and imaging survey available today, we cannot put useful constraints on the radial dark matter void profile. We invite independent investigations of our findings by releasing data and analysis code to the public at https://github.com/pmelchior/void-lensing.
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