Accurate Measurement of the Lensing Magnification by BOSS CMASS Galaxies and Its Implications for Cosmology and Dark Matter
Kun Xu,
Y. P. Jing,
Hongyu Gao
et al.
Abstract:Magnification serves as an independent and complementary gravitational lensing measurement to shear. We develop a novel method to achieve an accurate and robust magnification measurement around BOSS CMASS galaxies across physical scales of 0.016h
−1 Mpc < r
p < 10h
−1 Mpc. We first measure the excess total flux density δ
M of the source galaxies in the deep DECaLS photometric catalog that are lensed by CMASS galaxies. We convert δ
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