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arXiv 1702.01009astro-ph.CO
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普朗克透镜势图中的空穴分布

Void profile from Planck lensing potential map

Teeraparb Chantavat, Utane Sawangwit, Benjamin D. Wandelt

摘要:

我们利用普朗克宇宙微波背景辐射透镜重构分析得到的透镜势图和“公共宇宙虚空目录”测量了堆积虚空透镜势。在该轮廓中,需要四个参数来描述具有不同特征半径$R_V$的空隙的形状。然而,我们已经发现,在通过减去平均背景来减少背景噪声之后,在数据中留下了残余透镜功率。环境移位参数$γ_V$的包含对于获得具有剩余透镜化功率的数据的更好拟合是必要的。我们将空洞分为两个红移仓:cmass 1($0.45 < z < 0.5$)和cmass 2($0.5 < z < 0.6$)。对于具有123个空隙的cmass 1样品,我们的最佳拟合参数为$α= 1.989\pm0.149$、$β= 12.61\pm0.56$、$δ_c=-0.697\pm0.025$、$R_S/R_V=1.039\pm0.030$、$γ_v=(-7.034\pm0.150) \times 10^{-2}$;对于具有393个空隙的cmass 2样品,在68% C. L下,我们的最佳拟合参数为$α= 1.956\pm0.165$、$β= 12.91\pm0.60$、$δ_c=-0.673\pm0.027$、$R_S/R_V=1.115\pm0.032$、$γ_v=(-4.512\pm0.114) \times 10^{-2}$。环境参数的增加与斯隆数字巡天空洞位于低密度区域的推测是一致的。

英文摘要:

We use the lensing potential map from Planck CMB lensing reconstruction analysis and the "Public Cosmic Void Catalog" to measure the stacked void lensing potential. In this profile, four parameters are needed to describe the shape of voids with different characteristic radii $R_V$. However, we have found that after reducing the background noise by subtracting the average background, there is a residue lensing power left in the data. The inclusion of the environment shifting parameter, $γ_V$, is necessary to get a better fit to the data with the residue lensing power. We divide the voids into two redshift bins: cmass1 ($0.45 < z < 0.5$) and cmass2 ($0.5 < z < 0.6$). Our best-fit parameters are $α= 1.989\pm0.149$, $β= 12.61\pm0.56$, $δ_c=-0.697\pm0.025$, $R_S/R_V=1.039\pm0.030$, $γ_v=(-7.034\pm0.150) \times 10^{-2}$ for the cmass1 sample with 123 voids and $α= 1.956\pm0.165$, $β= 12.91\pm0.60$, $δ_c=-0.673\pm0.027$, $R_S/R_V=1.115\pm0.032$, $γ_v=(-4.512\pm0.114) \times 10^{-2}$ for the cmass2 sample with 393 voids at 68% C.L. The addition of the environment parameter is consistent with the conjecture that the Sloan Digital Sky Survey voids reside in an underdense region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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