黑暗能源调查3年结果：放大模型和对宇宙学限制的影响，来自星系聚类和星系 - 半镜头镜头

论文标题

黑暗能源调查3年结果：放大模型和对宇宙学限制的影响，来自星系聚类和星系 - 半镜头镜头

Dark Energy Survey Year 3 results: Magnification modeling and impact on cosmological constraints from galaxy clustering and galaxy-galaxy lensing

论文作者

Elvin-Poole, J., MacCrann, N., Everett, S., Prat, J., Rykoff, E. S., De Vicente, J., Yanny, B., Herner, K., Ferté, A., Di Valentino, E., Choi, A., Burke, D. L., Sevilla-Noarbe, I., Alarcon, A., Alves, O., Amon, A., Andrade-Oliveira, F., Baxter, E., Bechtol, K., Becker, M. R., Bernstein, G. M., Blazek, J., Camacho, H., Campos, A., Rosell, A. Carnero, Kind, M. Carrasco, Cawthon, R., Chang, C., Chen, R., Cordero, J., Crocce, M., Davis, C., DeRose, J., Diehl, H. T., Dodelson, S., Doux, C., Drlica-Wagner, A., Eckert, K., Eifler, T. F., Elsner, F., Fang, X., Fosalba, P., Friedrich, O., Gatti, M., Giannini, G., Gruen, D., Gruendl, R. A., Harrison, I., Hartley, W. G., Huang, H., Huff, E. M., Huterer, D., Krause, E., Kuropatkin, N., Leget, P. -F., Lemos, P., Liddle, A. R., McCullough, J., Muir, J., Myles, J., Navarro-Alsina, A., Pandey, S., Park, Y., Porredon, A., Raveri, M., Rodriguez-Monroy, M., Rollins, R. P., Roodman, A., Rosenfeld, R., Ross, A. J., Sánchez, C., Sanchez, J., Secco, L. F., Sheldon, E., Shin, T., Troxel, M. A., Tutusaus, I., Varga, T. N., Weaverdyck, N., Wechsler, R. H., Yin, B., Zhang, Y., Zuntz, J., Aguena, M., Avila, S., Bacon, D., Bertin, E., Bocquet, S., Brooks, D., García-Bellido, J., Honscheid, K., Jarvis, M., Li, T. S., Mena-Fernández, J., To, C., Wilkinson, R. D.

论文摘要

我们使用两个不同的晶状体样本研究了黑暗能源调查中的放大倍数3年的星系聚类和星系 - 半透镜的分析：一个发光红色星系的样本，红色的红色星系和一个具有红移依赖性幅度量限制的样品。我们解释了放大倍数对星系通量和尺寸选择的影响，从而考虑了使用Balrog图像模拟的系统效果。我们估计放大倍数对星系聚类和星系 - 果透明镜头宇宙学分析的影响，发现它对于杂志样品来说是重要的系统。我们从星系群集自动相关和带有不同宏伟的先验的星系群集自动相关信号和星系 - 冰淇淋镜头信号中显示出宇宙学的约束，在$λ$ CDM和$ W $ CDM中找到了宇宙学参数的广泛一致性。但是，当允许放大偏置振幅是免费的时，我们发现两点相关功能更喜欢与从图像模拟得出的基准输入不同的幅度。我们通过比较镜头箱之间的跨群集与基线分析的预测来验证放大分析，该镜头分析仅使用透镜箱的自动相关，表明放大倍数以外的系统学可能是差异的原因。我们显示，将镜头红移箱之间的跨簇添加到拟合度中，可以显着改善镜头放大参数的约束，并允许在放大系数上使用非信息性先验，而不会损失约束功率或先前的体积问题。

We study the effect of magnification in the Dark Energy Survey Year 3 analysis of galaxy clustering and galaxy-galaxy lensing, using two different lens samples: a sample of Luminous red galaxies, redMaGiC, and a sample with a redshift-dependent magnitude limit, MagLim. We account for the effect of magnification on both the flux and size selection of galaxies, accounting for systematic effects using the Balrog image simulations. We estimate the impact of magnification on the galaxy clustering and galaxy-galaxy lensing cosmology analysis, finding it to be a significant systematic for the MagLim sample. We show cosmological constraints from the galaxy clustering auto-correlation and galaxy-galaxy lensing signal with different magnifications priors, finding broad consistency in cosmological parameters in $Λ$CDM and $w$CDM. However, when magnification bias amplitude is allowed to be free, we find the two-point correlations functions prefer a different amplitude to the fiducial input derived from the image simulations. We validate the magnification analysis by comparing the cross-clustering between lens bins with the prediction from the baseline analysis, which uses only the auto-correlation of the lens bins, indicating systematics other than magnification may be the cause of the discrepancy. We show adding the cross-clustering between lens redshift bins to the fit significantly improves the constraints on lens magnification parameters and allows uninformative priors to be used on magnification coefficients, without any loss of constraining power or prior volume concerns.

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