论文标题
部分可观测时空混沌系统的无模型预测
Cosmic Census: Relative Distributions of Dark Matter, Galaxies and Diffuse Gas
论文作者
论文摘要
星系，扩散气和暗物质构成了定义宇宙大规模结构的宇宙网络。我们通过通过透镜收敛图和planck Mission的Thermal Sunyaev-Zeldovich（TSZ）效应的恒星质量和Thermal Sunyaev-Zeldovich（TSZ）效应来限制了这些成分的联合分布。将基于光晕的模型拟合到我们测得的角功率谱（Galaxy-galaxy，Galaxy-Galaxy，Galaxy-Sening Contgence和Galaxy-TSZ）的中间红移$ z = 0.53 $，我们检测到具有星系卫星分数和星系空间分布的恒星质量的变化。我们找到了tsz-halo静液压质量偏见，$ b_h $，因此$（1-b_h）= 0.6 \ pm0.05 $，在高恒星质量端具有更大的偏见，$ b_h $。星系 - 宇宙微波背景透镜跨功率谱的归一化表明，星系在没有随机性的情况下追踪物质分布（$ a = 0.98 \ pm 0.09 $）。我们预测，下一代宇宙微波背景实验将使对静液压偏置的约束提高两个因子，并将能够限制暗物质的小规模分布，从而告知反馈过程的理论。
Galaxies, diffuse gas, and dark matter make up the cosmic web that defines the large-scale structure of the Universe. We constrained the joint distribution of these constituents by cross-correlating galaxy samples binned by stellar mass from the Sloan Digital Sky Survey CMASS catalog with maps of lensing convergence and the thermal Sunyaev-Zeldovich (tSZ) effect from the Planck mission. Fitting a halo-based model to our measured angular power spectra (galaxy-galaxy, galaxy-lensing convergence, and galaxy-tSZ) at a median redshift of $z=0.53$, we detected variation with stellar mass of the galaxy satellite fraction and galaxy spatial distribution within host halos. We find a tSZ-halo hydrostatic mass bias, $b_h$, such that $(1-b_h)=0.6\pm0.05$, with a hint of a larger bias, $b_h$, at the high stellar mass end. The normalization of the galaxy-cosmic microwave background lensing convergence cross-power spectrum shows that galaxies trace the matter distribution without an indication of stochasticity ($A=0.98\pm 0.09$). We forecast that next-generation cosmic microwave background experiments will improve the constraints on the hydrostatic bias by a factor of two and will be able to constrain the small-scale distribution of dark matter, hence informing the theory of feedback processes.
