论文标题
Websy turagalactic CMB模拟
The Websky Extragalactic CMB Simulations
论文作者
论文摘要
我们提出了一条新的管道，用于有效地生成乳突外微波天空的合成观测，该观测是根据大型地面CMB实验量身定制的，例如Simons天文台，晚期ACTPOL，SPT-3G和CMB-S4。由于需要动态范围和准确性，因此这种模拟观察是宇宙学的关键技术挑战。从给定的位置可以看出，管道的第一部分以暗物质光环目录和物质位移场的形式产生了随机的宇宙学实现。分别以椭圆形塌陷动力学和拉格朗日扰动理论对光晕目录和位移场进行建模。在第二部分中，使用基于现有观测值和流体动力学模拟的模型，将宇宙学实现转换为在10-10^3 GHz范围内的一组强度图。这些地图包括从尘土恒星形成星系（CIB）的红外排放，通过热气体组成CMB光子，通过热气体和聚类通过热的Sunyaev-Zel'Dovich效应（TSZ），多普勒通过thomson通过KINYAEV SUNYAEV-ZELEL'DERENTIANT和KINYAD SUNYAEV-ZEL'DOVICH-ZEL'DOVICH'DOPPLER散射（thomson）通过thomson散射（kinyev sunyaev-zel'devich and fement）（ CMB各向异性通过宇宙中物质的大规模分布。在描述了管道及其实现之后，我们介绍了Websy地图，该地图是由宇宙网络在我们过去的光锥上实现的红移间隔，在全面的红移间隔0 <z <4.6和〜（600 gpc/h）^3的体积（600 gpc/h）^3以〜10^12分辨率元素解决。 Websky Maps和Halo目录可在mocks.cita.utoronto.ca/websky上公开获取。
We present a new pipeline for the efficient generation of synthetic observations of the extragalactic microwave sky, tailored to large ground-based CMB experiments such as the Simons Observatory, Advanced ACTPol, SPT-3G, and CMB-S4. Such simulated observations are a key technical challenge in cosmology because of the dynamic range and accuracy required. The first part of the pipeline generates a random cosmological realization in the form of a dark matter halo catalog and matter displacement field, as seen from a given position. The halo catalog and displacement field are modeled with ellipsoidal collapse dynamics and Lagrangian perturbation theory, respectively. In the second part, the cosmological realization is converted into a set of intensity maps over the range 10 - 10^3 GHz using models based on existing observations and hydrodynamical simulations. These maps include infrared emission from dusty star forming galaxies (CIB), Comptonization of CMB photons by hot gas in groups and clusters through the thermal Sunyaev-Zel'dovich effect (tSZ), Doppler boosting by Thomson scattering of the CMB by bulk flows through the kinetic Sunyaev-Zel'dovich effect (kSZ), and weak gravitational lensing of primary CMB anisotropies by the large-scale distribution of matter in the universe. After describing the pipeline and its implementation, we present the Websky maps, created from a realization of the cosmic web on our past light cone in the redshift interval 0<z<4.6 over the full-sky and a volume of ~(600 Gpc/h)^3 resolved with ~10^12 resolution elements. The Websky maps and halo catalog are publicly available at mocks.cita.utoronto.ca/websky.
