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arXiv 2011.03411astro-ph.CO
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暗能量巡天第3年结果:在组合星系团和星系-星系透镜分析中优化透镜样本

Dark Energy Survey Year 3 Results: Optimizing the Lens Sample in Combined Galaxy Clustering and Galaxy-Galaxy Lensing Analysis

A. Porredon, M. Crocce, P. Fosalba, J. Elvin-Poole, A. Carnero Rosell, R. Cawthon, T. F. Eifler, X. Fang, I. Ferrero, E. Krause, N. MacCrann, N. Weaverdyck, T. … 展开作者

A. Porredon, M. Crocce, P. Fosalba, J. Elvin-Poole, A. Carnero Rosell, R. Cawthon, T. F. Eifler, X. Fang, I. Ferrero, E. Krause, N. MacCrann, N. Weaverdyck, T. M. C. Abbott, M. Aguena, S. Allam, A. Amon, S. Avila, D. Bacon, E. Bertin, S. Bhargava, S. L. Bridle, D. Brooks, M. Carrasco Kind, J. Carretero, F. J. Castander, A. Choi, M. Costanzi, L. N. da Costa, M. E. S. Pereira, J. De Vicente, S. Desai, H. T. Diehl, P. Doel, A. Drlica-Wagner, K. Eckert, A. Ferté, B. Flaugher, J. Frieman, J. García-Bellido, E. Gaztanaga, D. W. Gerdes, T. Giannantonio, D. Gruen, R. A. Gruendl, J. Gschwend, G. Gutierrez, W. G. Hartley, S. R. Hinton, D. L. Hollowood, K. Honscheid, B. Hoyle, D. J. James, M. Jarvis, K. Kuehn, N. Kuropatkin, M. A. G. Maia, J. L. Marshall, F. Menanteau, R. Miquel, R. Morgan, A. Palmese, S. Pandey, F. Paz-Chinchón, A. A. Plazas, M. Rodriguez-Monroy, A. Roodman, S. Samuroff, E. Sanchez, V. Scarpine, S. Serrano, I. Sevilla-Noarbe, M. Smith, M. Soares-Santos, E. Suchyta, M. E. C. Swanson, G. Tarle, C. To, T. N. Varga, J. Weller, R. D. Wilkinson

摘要:

我们调查的潜在收益的宇宙学约束相结合的星系集群和星系-星系透镜的透镜星系样本选择使用信息从暗能量调查(DES)第3年的数据,并假设DES第1年元校准样本的来源。我们探索容易再现的选择的基础上的幅度削减$i$-波段作为(光度)红移,$z_{\rm phot}$的函数,和基准的潜在收益对那些使用完善的redMaGiC样本。我们专注于密度和光度红移精度之间的平衡,同时边缘化一组现实的宇宙学和系统参数。我们的最佳选择,MagLim样本,满足$i < 4 \, z_{\rm phot} + 18$,并有$\sim 30\%$更广泛的红移分布,但$\sim 3.5$倍的星系比redMaGiC。假设wCDM模型和等效尺度切割以减轻非线性效应,这导致$Ω_m$、$w$和$σ_8$的配对组合的品质因数的$40\%$增加,以及$σ_8$中的$16\%$、$Ω_m$中的$10\%$和$w$中的$12\%$的增益。同样,在LCDM中,我们发现$19\%$和$27\%$分别对$σ_8$和$Ω_m$进行了改进。我们还探讨了通量有限的样本与平坦的幅度削减发现,最佳的选择,$i < 22.2$,有$\sim 7$倍更多的星系和$\sim 20\%$更广泛的红移分布相比,MagLim,但略差的限制。我们表明,我们的研究结果是强大的假设星系的偏见和光度红移的不确定性,只有适度的进一步增加数量的层析箱或包含箱互相关的增益,除了在通量有限的样本的情况下,这些增益是更显着的。

英文摘要:

We investigate potential gains in cosmological constraints from the combination of galaxy clustering and galaxy-galaxy lensing by optimizing the lens galaxy sample selection using information from Dark Energy Survey (DES) Year 3 data and assuming the DES Year 1 Metacalibration sample for the sources. We explore easily reproducible selections based on magnitude cuts in $i$-band as a function of (photometric) redshift, $z_{\rm phot}$, and benchmark the potential gains against those using the well established redMaGiC sample. We focus on the balance between density and photometric redshift accuracy, while marginalizing over a realistic set of cosmological and systematic parameters. Our optimal selection, the MagLim sample, satisfies $i < 4 \, z_{\rm phot} + 18$ and has $\sim 30\%$ wider redshift distributions but $\sim 3.5$ times more galaxies than redMaGiC. Assuming a wCDM model and equivalent scale cuts to mitigate nonlinear effects, this leads to $40\%$ increase in the figure of merit for the pair combinations of $Ω_m$, $w$, and $σ_8$, and gains of $16\%$ in $σ_8$, $10\%$ in $Ω_m$, and $12\%$ in $w$. Similarly, in LCDM we find an improvement of $19\%$ and $27\%$ on $σ_8$ and $Ω_m$, respectively. We also explore flux-limited samples with a flat magnitude cut finding that the optimal selection, $i < 22.2$, has $\sim 7$ times more galaxies and $\sim 20\%$ wider redshift distributions compared to MagLim, but slightly worse constraints. We show that our results are robust with respect to the assumed galaxy bias and photometric redshift uncertainties with only moderate further gains from increased number of tomographic bins or the inclusion of bin cross-correlations, except in the case of the flux-limited sample, for which these gains are more significant.

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