We constrain cosmological parameters and galaxy-bias parameters using the combination of galaxy clustering and galaxy-galaxy lensing measurements from the Dark Energy Survey (DES) year-3 data. We describe our modeling framework and choice of scales analyzed, validating their robustness to theoretical uncertainties in small-scale clustering by analyzing simulated data. Using a linear galaxy-bias model and redMaGiC galaxy sample, we obtain 10% constraints on the matter density of the Universe. We also implement a nonlinear galaxy-bias model to probe smaller scales that includes parametrization based on hybrid perturbation theory and find that it leads to a 17% gain in cosmological constraining power. We perform robustness tests of our methodology pipeline and demonstrate stability of the constraints to changes in the theory model. Using the redMaGiC galaxy sample as foreground lens galaxies and adopting the best-fitting cosmological parameters from DES year-1 data, we find the galaxy clustering and galaxy-galaxy lensing measurements to exhibit significant signals akin to decorrelation between galaxies and mass on large scales, which is not expected in any current models. This likely systematic measurement error biases our constraints on galaxy bias and the $S_8$ parameter. We find that a scale-, redshift- and sky-area-independent phenomenological decorrelation parameter can effectively capture this inconsistency between the galaxy clustering and galaxy-galaxy lensing. We trace the source of this correlation to a color-dependent photometric issue and minimize its impact on our result by changing the selection criteria of redMaGiC galaxies. Using this new sample, our constraints on the $S_8$ parameter are consistent with previous studies and we find a small shift in the ${\mathrm{\Omega }}_{\mathrm{m}}$ constraints compared to the fiducial redMaGiC sample. We infer the constraints on the mean host-halo mass of the redMaGiC galaxies in this new sample from the large-scale bias constraints, finding the galaxies occupy halos of mass approximately $1.6\times {10}^{13}{M}_{\odot }/h$.

中文翻译：

---

暗能量调查第 3 年结果：使用 redMaGiC 样本的星系聚类和星系-星系透镜对宇宙学参数和星系偏差模型的约束

我们使用来自暗能量调查 (DES) 第 3 年数据的星系聚类和星系-星系透镜测量的组合来约束宇宙学参数和星系偏差参数。我们描述了我们的建模框架和分析的尺度选择，通过分析模拟数据验证了它们对小规模聚类中理论不确定性的鲁棒性。使用线性星系偏差模型和 redMaGiC 星系样本，我们获得了对宇宙物质密度的 10% 的约束。我们还实现了一个非线性星系偏差模型来探测更小的尺度，包括基于混合扰动理论的参数化，并发现它导致宇宙约束力增加了 17%。我们对我们的方法流程进行稳健性测试，并证明约束对理论模型变化的稳定性。使用 redMaGiC 星系样本作为前景透镜星系，并采用来自 DES 第 1 年数据的最佳宇宙学参数，我们发现星系聚类和星系-星系透镜测量显示出类似于大尺度上星系和质量之间去相关的重要信号，在任何当前模型中都不会出现这种情况。这种可能的系统测量误差使我们对星系偏差的约束和${\mathrm{小号}}_8$范围。我们发现，与尺度、红移和天空区域无关的唯象去相关参数可以有效地捕捉星系团聚和星系-星系透镜之间的这种不一致性。我们将这种相关性的来源追溯到与颜色相关的光度问题，并通过改变 redMaGiC 星系的选择标准来最大限度地减少其对我们结果的影响。使用这个新样本，我们对${\mathrm{小号}}_8$参数与之前的研究一致，我们发现${\mathrm{\Omega }}_{\mathrm{米}}$与基准 redMaGiC 样本相比的约束。我们从大尺度偏差约束中推断出对这个新样本中 redMaGiC 星系平均宿主晕质量的约束，发现星系占据了大约质量晕$1.6\times {10}^{13}{米}_{\odot }/H$.