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arXiv 0804.0373astro-ph
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星系三点关联函数的弱透镜效应

Weak Lensing Effects on the Galaxy Three-Point Correlation Function

Fabian Schmidt, Alberto Vallinotto, Emiliano Sefusatti, Scott Dodelson

摘要:

研究了由于物质沿视线方向的分布引起的弱透镜放大率对星系三点关联函数(3PCF)的修正。我们一贯推导出所有的修正项产生的二阶微扰理论,并提供解析表达式以及其相对重要性的数量级估计。放大率的贡献取决于投影在天空平面上的三角形的几何形状,并与所考虑的星系样本的计数斜率和红移的不同幂次成比例。我们评估所有条款的数值,并表明,根据三角形配置以及考虑的星系样本,弱透镜一般可以显着的贡献和改变三点关联函数观察到通过星系和类星体目录。

英文摘要:

We study the corrections to the galaxy three-point correlation function (3PCF) induced by weak lensing magnification due to the matter distribution along the line of sight. We consistently derive all the correction terms arising up to second order in perturbation theory and provide analytic expressions as well as order of magnitude estimates for their relative importance. The magnification contributions depend on the geometry of the projected triangle on the sky plane, and scale with different powers of the number count slope and redshift of the galaxy sample considered. We evaluate all terms numerically and show that, depending on the triangle configuration as well as the galaxy sample considered, weak lensing can in general significantly contribute to and alter the three-point correlation function observed through galaxy and quasar catalogs.

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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