Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 744, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/744/2/L22
Keywords
dark matter; gravitational lensing: weak; large-scale structure of universe
Categories
Funding
- 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
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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.
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