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超新星主焦点相机第三年结果:基于最小偏差模型的HSC与SDSS星系成团和弱引力透镜宇宙学

Hyper Suprime-Cam Year 3 Results: Cosmology from Galaxy Clustering and Weak Lensing with HSC and SDSS using the Minimal Bias Model

Sunao Sugiyama, Hironao Miyatake, Surhud More, Xiangchong Li, Masato Shirasaki, Masahiro Takada, Yosuke Kobayashi, Ryuichi Takahashi, Takahiro Nishimichi, Atsus… 展开作者

Sunao Sugiyama, Hironao Miyatake, Surhud More, Xiangchong Li, Masato Shirasaki, Masahiro Takada, Yosuke Kobayashi, Ryuichi Takahashi, Takahiro Nishimichi, Atsushi J. Nishizawa, Markus M. Rau, Tianqing Zhang, Roohi Dalal, Rachel Mandelbaum, Michael A. Strauss, Takashi Hamana, Masamune Oguri, Ken Osato, Arun Kannawadi, Robert Armstrong, Yutaka Komiyama, Robert H. Lupton, Nate B. Lust, Satoshi Miyazaki, Hitoshi Murayama, Yuki Okura, Paul A. Price, Philip J. Tait, Masayuki Tanaka, Shiang-Yu Wang

AI总结:

基于HSC-Y3成像与SDSS光谱数据,联合分析星系成团、星系-星系弱透镜和宇宙剪切,采用最小偏差模型,在平坦ΛCDM下得到S8=0.775,与Planck 2018一致但误差较大。

摘要:

我们展示了来自盲联合分析的宇宙学参数约束,该分析基于超新星主焦点相机第三年(HSC-Y3)成像数据(覆盖416平方度)和SDSS DR11光谱星系(红移范围[0.15, 0.70])测量的三个两点相关函数。我们将SDSS星系按红移分为三个体积限制样本,每个样本作为大尺度结构示踪体,通过投影相关函数$w_{\rm p}(R)$的测量来表征。我们还利用这些SDSS样本的星系-星系弱引力透镜信号$\Delta\Sigma(R)$的测量,这些样本作为透镜体,其源星系样本来自HSC-Y3形状目录,基于测光红移选择。我们将这些测量与HSC源样本的宇宙剪切相关函数$\xi_{\pm}(\vartheta)$相结合。我们在平坦$\Lambda$CDM宇宙学背景下,使用最小偏差模型对这些可观测量进行建模。我们采用保守的尺度截断,对$\Delta\Sigma$和$w_{\rm p}$分别取$R>12$和$8~h^{-1}$Mpc,在此范围内最小偏差模型有效,同时对HSC测光源星系的平均红移残差偏差采用保守先验。我们的基线分析在$\Lambda$CDM模型下得到$S_8=0.775^{+0.043}_{-0.038}$(68%置信区间),在对其他参数不确定性进行边缘化后。我们的$S_8$值与Planck 2018数据一致,但我们的结果可信区间仍相对较大。我们的结果在统计上与一篇配套论文一致,该论文将分析扩展到更小尺度,使用基于模拟器的晕模型。

英文摘要:

We present cosmological parameter constraints from a blind joint analysis of three two-point correlation functions measured from the Year 3 Hyper Suprime-Cam (HSC-Y3) imaging data, covering 416 deg$^2$, and the SDSS DR11 spectroscopic galaxies spanning the redshift range $[0.15, 0.70]$. We subdivide the SDSS galaxies into three volume-limited samples separated in redshift, each of which acts as a large-scale structure tracer characterized by the measurement of the projected correlation function, $w_{\rm p}(R)$. We also use the measurements of the galaxy-galaxy weak lensing signal $ΔΣ(R)$ for each of these SDSS samples which act as lenses for a secure sample of source galaxies selected from the HSC-Y3 shape catalog based on their photometric redshifts. We combine these measurements with the cosmic shear correlation functions, $ξ_{\pm}(\vartheta)$, measured for our HSC source sample. We model these observables with the minimal bias model of the galaxy clustering observables in the context of a flat $Λ$CDM cosmology. We use conservative scale cuts, $R>12$ and $8~h^{-1}$Mpc, for $ΔΣ$ and $w_{\rm p}$, respectively, where the minimal bias model is valid, in addition to conservative prior on the residual bias in the mean redshift of the HSC photometric source galaxies. Our baseline analysis yields $S_8=0.775^{+0.043}_{-0.038}$ (68% C.I.) for the $Λ$CDM model, after marginalizing over uncertainties in other parameters. Our value of $S_8$ is consistent with that from the Planck 2018 data, but the credible interval of our result is still relatively large. Our results are statistically consistent with those of a companion paper, which extends this analysis to smaller scales with an emulator-based halo model.

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