用CMB当背景光源，经过引力透镜探测暗物质

用CMB当背景光源，经过引力透镜探测暗物质

First Identification of a CMB Lensing Signal Produced by 1.5 Million Galaxies at $z\sim 4$: Constraints on Matter Density Fluctuations at High Redshift

Hironao Miyatake, Yuichi Harikane, Masami Ouchi, Yoshiaki Ono, Nanaka Yamamoto, Atsushi J. Nishizawa, Neta Bahcall, Satoshi Miyazaki, and Andrés A. Plazas Malagón

Phys. Rev. Lett. 129, 061301 – Published 1 August 2022

ABSTRACT

We report the first detection of the dark matter distribution around Lyman break galaxies (LBGs) at high redshift through the cosmic microwave background (CMB) lensing measurements with the public Planck PR3 $\kappa$ map. The LBG sample consists of 1 473 106 objects with the median redshift of $z\sim 4$ that are identified in a total area of $305{\mathrm{deg}}^2$ observed by the Hyper Suprime-Cam Strategic Survey Program survey. After careful investigations of systematic uncertainties, such as contamination from foreground galaxies and cosmic infrared background, we obtain the significant detection of the CMB lensing signal at $5.1\sigma$ that is dominated by 2-halo term signals of the LBGs. Fitting a simple model consisting of the Navarro-Frenk-White profile and the linear-bias model, we obtain the typical halo mass of $M_h=2.9_{-2.5}^{+9.5}\times {10}^{11}{h}^{-1}{M}_{\odot }$. Combining the CMB lensing and galaxy-galaxy clustering signals on the large scales, we demonstrate the first cosmological analysis at $z\sim 4$ that constrains $({\Omega }_{m0},{\sigma }_8)$. We find that our constraint on ${\sigma }_8$ is roughly consistent with the Planck cosmology, while this ${\sigma }_8$ constraint is lower than the Planck cosmology over the $1\sigma$ level. This study opens up a new window for constraining cosmological parameters at high redshift by the combination of CMB and high-$z$ galaxies, as well as studying the interplay between galaxy evolution and large-scale structure at such high redshift, by upcoming CMB and optical and near-infrared imaging surveys.

来源： https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.129.061301

这样就把背景光源的红移提高到最高了（没有比这更远的了）。

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