论文标题
Astraeus II：量化电离时期宇宙方差的影响
Astraeus II: Quantifying the impact of cosmic variance during the Epoch of Reionization
论文作者
论文摘要
下一代望远镜（例如James Webb太空望远镜（JWST）和Nancy Grace Roman Space望远镜（NGRST）将使我们能够以前所未有的细节来研究宇宙的前十亿年。在这项工作中，我们使用Astraeus（N体暗物质模拟中星系形成和电离的半数字辐射转移耦合）框架，使星系的形成和恢复（对于广泛的回流反馈模型）来估算UV Luminosusy函数（UV LF）的函数（uv lf lf）和SPERNAR（uv lf）和SPERNAR（uv lf）和SPERNAR（uv lf）的函数（uv lf）和SPERNAR（uv lf）的函数（uv lf）。我们发现，不同的电源场景在宇宙差异中起较小的作用。大多数宇宙差异完全由基础密度字段驱动，并增加了$ {\ rm m} _ {\ rm m} _ {\ rm uv} \ sim -17.5（-20）$的$ z = 12（6）$的jades-deep-deep jwst deptive jwst forde jwst forde jwst forveed jwst forde jwst the wite jwst forveed jwst compation $ jwst compution $ z = 12（6）$宇宙差异随着调查区域的增加而降低，大约独立于红移。我们发现，Lyman破裂星系（LBGS）UV LF的淡淡端（$ {\ rm m} _ {\ rm UV}> -17 $）斜率越来越浅，随着越来越大的回报反馈，并显示JWST观察如何将JWST观测值分别在$ z> 9 $中区分$ z> 9 $的不同模型，甚至如何区分$ z> 9 $的依据。我们还显示了EOR期间Lyman破裂星系的环境（在密度和电离场上），发现潜在的过度密度和电离分数尺度呈紫外线亮度积极成肯定。最后，我们还提供了一种公共软件工具，可让有兴趣的读者计算不同的红移和调查领域的宇宙差异。
Next generation telescopes such as the James Webb Space Telescope (JWST) and the Nancy Grace Roman Space Telescope (NGRST) will enable us to study the first billion years of our Universe in unprecedented detail. In this work we use the ASTRAEUS (semi-numerical rAdiative tranSfer coupling of galaxy formaTion and Reionization in N-body dArk mattEr simUlationS) framework, that couples galaxy formation and reionization (for a wide range of reionization feedback models), to estimate the cosmic variance expected in the UV Luminosity Function (UV LF) and the Stellar Mass Function (SMF) in JWST surveys. We find that different reionization scenarios play a minor role in the cosmic variance. Most of the cosmic variance is completely driven by the underlying density field and increases above $100\%$ for ${\rm M}_{\rm UV} \sim -17.5 (-20)$ at $z =12 (6)$ for the JADES-deep survey (the deep JWST Advanced Extragalactic Survey with an area of 46 arcmin$^2$); the cosmic variance decreases with an increasing survey area roughly independently of redshift. We find that the faint-end (${\rm M}_{\rm UV} > -17$) slope of the Lyman Break Galaxies (LBGs) UV LF becomes increasingly shallower with increasing reionization feedback and show how JWST observations will be able to distinguish between different models of reionization feedback at $z>9$, even accounting for cosmic variance. We also show the environments (in terms of density and ionization fields)of Lyman Break Galaxies during the EoR, finding that the underlying over-density and ionization fraction scale positively with the UV luminosity. Finally, we also provide a public software tool to allow interested readers to compute cosmic variance for different redshifts and survey areas.
