期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 744, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/744/2/L22
关键词
dark matter; gravitational lensing: weak; large-scale structure of universe
资金
- Gordon and Betty Moore Foundation
- STFC
- JPL
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Grants-in-Aid for Scientific Research [23740144] Funding Source: KAKEN
- STFC [PP/E006450/1, ST/I001166/1, ST/I00162X/1, ST/H008519/1, ST/F002289/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001166/1, PP/E006450/1, ST/H008519/1, ST/I00162X/1, ST/F002289/1] Funding Source: researchfish
Weak lensing is commonly measured using shear through galaxy ellipticities or using the effect of magnification bias on galaxy number densities. Here, we report on the first detection of weak-lensing magnification with a new, independent technique using the distribution of galaxy sizes and magnitudes. These data come for free in galaxy surveys designed for measuring shear. We present the magnification estimator and apply it to an X-ray-selected sample of galaxy groups in the COSMOS Hubble Space Telescope survey. The measurement of the projected surface density Sigma(r) is consistent with the shear measurements within the uncertainties and has roughly 40% of the signal to noise of the latter. We discuss systematic issues and challenges to realizing the potential of this new probe of weak lensing.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据