Euclid : Forecasts from the void-lensing cross-correlation
Euclid : Forecasts from the void-lensing cross-correlation
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Euclid：空透镜互相关的预测
DOI：
10.1051/0004-6361/202244445
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发表时间：
2023
影响因子：
6.5
通讯作者：
Bonici M
中科院分区：
文献类型：
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作者：
Bonici M
欧几里德太空望远镜将调查一个由密集的星系样本追踪的宇宙空洞的大数据集。在这项工作中，我们估计其预期的性能时，利用角光度空洞集群，星系弱透镜，和它们的互相关。为了这个目标，我们实施了一个Fisher矩阵的方法，从theEuclidphotometric数据集的空隙量身定制，我们提出了第一个预测宇宙学参数，包括空隙透镜相关性。我们研究了两种不同的探头设置，悲观和乐观，无论是空集群和星系透镜。我们在四种宇宙学模型中进行了预测分析，考虑了不同的中微子总质量Mν和动态暗能量（DE）状态方程w（z），由流行的Chevallier-Polarski-Linder参数化描述。我们发现，空簇的限制，一方面Ω裸竞争与星系透镜单独，而误差onns减少由于两个探针在二维投影参数空间的正交性。我们还注意到，总体而言，相对于假设两个探测器是独立的，包含空洞透镜互相关信号将参数约束改善了10 − 15%，并将联合空洞聚类和星系透镜优值（FoM）分别提高了10%和25%，在悲观和乐观的情况下。 最后，当进一步结合光谱星系团，假设作为一个独立的探针，我们发现，在最具竞争力的情况下，FoM增加了4倍的弱透镜和光谱星系团作为独立的探针的组合。本文的预测结果表明，光度空洞成团及其与星系透镜效应的互相关性值得在欧几里德星系巡天的数据分析中加以利用，并有望提高其对h、ΩB、中微子质量和DE演化的约束能力。
TheEuclidspace telescope will survey a large dataset of cosmic voids traced by dense samples of galaxies. In this work we estimate its expected performance when exploiting angular photometric void clustering, galaxy weak lensing, and their cross-correlation. To this aim, we implemented a Fisher matrix approach tailored for voids from theEuclidphotometric dataset and we present the first forecasts on cosmological parameters that include the void-lensing correlation. We examined two different probe settings, pessimistic and optimistic, both for void clustering and galaxy lensing. We carried out forecast analyses in four model cosmologies, accounting for a varying total neutrino mass,Mν, and a dynamical dark energy (DE) equation of state,w(z), described by the popular Chevallier-Polarski-Linder parametrization. We find that void clustering constraints onhand Ωbare competitive with galaxy lensing alone, while errors onnsdecrease thanks to the orthogonality of the two probes in the 2D-projected parameter space. We also note that, as a whole, with respect to assuming the two probes as independent, the inclusion of the void-lensing cross-correlation signal improves parameter constraints by 10 − 15%, and enhances the joint void clustering and galaxy lensing figure of merit (FoM) by 10% and 25%, in the pessimistic and optimistic scenarios, respectively. Finally, when further combining with the spectroscopic galaxy clustering, assumed as an independent probe, we find that, in the most competitive case, the FoM increases by a factor of 4 with respect to the combination of weak lensing and spectroscopic galaxy clustering taken as independent probes. The forecasts presented in this work show that photometric void clustering and its cross-correlation with galaxy lensing deserve to be exploited in the data analysis of theEuclidgalaxy survey and promise to improve its constraining power, especially onh, Ωb, the neutrino mass, and the DE evolution.