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arXiv 2603.04025astro-ph.CO
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光度密度脊的弱透镜效应

Weak Lensing by Photometric Density Ridges

University of Gdansk(格但斯克大学);University of Edinburgh(爱丁堡大学)

Mehraveh Nikjoo, Joe Zuntz, Ben Moews

AI总结:

研究通过改进算法检测光度密度脊的弱透镜效应,并探讨其对宇宙学参数的依赖性。

摘要:

在通过光度调查测量的星系密度场中,脊是宇宙网中丝状结构的二维投影,因此应从背景星系中透镜光。我们报告在暗能量调查第三年数据中检测到这种效应,具有高显著性,尽管并非独立于星系-星系透镜效应。我们描述了改进现有的子空间约束均值移位算法,以在大规模上高效定位这些脊,并检查信号在模拟中的依赖性,取决于宇宙学和算法参数。我们发现它主要取决于S8=σ8(Ωm/0.3)^{1/2},并讨论了需要改进的方法以允许精确参数估计。

英文摘要:

Ridges in galaxy density fields measured by photometric surveys are 2D projections of filaments in the cosmic web, and so should lens light from background galaxies. We report on a detection of this effect in Dark Energy Survey Year 3 data at high significance, though not independently of galaxy-galaxy lensing. We describe improvements to the existing subspace-constrained mean shift algorithm to locate these ridges efficiently at scale, and examine the dependence of the signal in simulations on cosmological and algorithmic parameters. We find that it depends primarily on $S_8=σ_8 \left( Ω_m / 0.3 \right)^{1/2}$, and discuss improvements to our methodology that would be needed to allow precision parameter estimation.

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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