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arXiv 2103.15862astro-ph.COastro-ph.GA
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$z\sim$ 4的$1.5$百万伽产生的CMB透镜信号的首次识别:对高红移下物质密度涨落的约束

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, Andrés A. Plazas Malagón

摘要:

利用公开的{ \it Planck} PR 3 $κ$图,通过宇宙微波背景辐射(CMB)透镜测量,首次探测到了高红移的Lyman break星系(LBG)周围的暗物质分布. LBG样本由1,473,106个中位红移为$z \sim 4$的天体组成,这些天体是由超级超级凸轮(HSC)战略调查计划(SSP)调查在305度$^2$的总面积中确定的。在仔细研究了前景星系和宇宙红外背景(CIB)的污染等系统不确定性之后,我们在$5.1σ$观测到了由LBG的2-halo项信号主导的CMB透镜信号。拟合一个简单的模型组成的Navarro-Frenk-White(NFW)的轮廓和线性偏置模型,我们得到了典型的晕质量的$2.9^{+9.5}_{-2.5} \times 10^{11} h^{-1} M_\odot$。结合大尺度上的CMB透镜和星系-星系团信号,我们证明了在$z\sim4$约束$(Ω_{{\rm m}0}$,$σ_8)$的第一个宇宙学分析。我们发现我们对$σ_8$的约束与{ \it Planck}最佳拟合宇宙学基本一致,而这个$σ_8$约束在$1σ$水平上低于{ \it Planck}宇宙学.这项研究为通过CMB和高$z$星系的组合来约束高红移下的宇宙学参数以及通过即将到来的CMB和光学及近红外成像巡天来研究高红移下星系演化与大尺度结构之间的相互作用开辟了一个新的窗口。

英文摘要:

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 {\it Planck} PR3 $κ$ 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 deg$^2$ observed by the Hyper Suprime-Cam (HSC) Strategic Survey Program (SSP) survey. After careful investigations of systematic uncertainties, such as contamination from foreground galaxies and Cosmic Infrared Background (CIB), we obtain the significant detection of the CMB lensing signal at $5.1σ$ that is dominated by 2-halo term signals of the LBGs. Fitting a simple model consisting of the Navarro-Frenk-White (NFW) profile and the linear-bias model, we obtain the typical halo mass of $2.9^{+9.5}_{-2.5} \times 10^{11} h^{-1} M_\odot$. Combining the CMB lensing and galaxy-galaxy clustering signals on the large scales, we demonstrate the first cosmological analysis at $z\sim4$ that constrains $(Ω_{{\rm m}0}$, $σ_8)$. We find that our constraint on $σ_8$ is roughly consistent with the {\it Planck} best-fit cosmology, while this $σ_8$ constraint is lower than the {\it Planck} cosmology over the $1σ$ 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 larges-scale structure at such high redshift, by upcoming CMB and optical and near-infrared imaging surveys.

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