发表机构
Cosmic Dawn Center (DAWN); Niels Bohr Institute, University of Copenhagen（宇宙黎明中心; 哥本哈根大学尼尔斯·玻尔研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出利用紫外亮星系邻居的距离约束$z>10$处星系-暗晕联系，发现随机性对解释高紫外光度至关重要，并预测了区分模型所需的观测条件。
AI 中文摘要
JWST发现了紫外发光星系相对于JWST之前的星系形成模型外推的过量现象。区分提出的理论解释需要约束这些系统的暗晕质量，这可以通过成团性来探测。然而，在$z>10$处，低星系数密度使得传统的成团性测量具有挑战性。我们引入了一种新形式体系，利用$z>10$处单个紫外亮星系的局部环境（$\lesssim$2角分）信息来检验紫外光度函数过量所隐含的星系-暗晕联系的理论模型。我们使用(500 cMpc)$^3$的21cmFAST模拟创建模拟的JWST观测，以正向模拟紫外亮星系周围较暗的光度候选体的空间分布。我们发现，到最近邻居的距离对紫外光度-暗晕质量关系的随机性敏感，并能区分紫外光度在星系中均匀增强的模型与在固定暗晕质量下紫外光度具有高随机性的模型。作为概念验证，我们将我们的框架应用于$z>10$处两个最亮的已确认星系GN-z11和JADES-GS-z14-0周围的观测，发现这些源周围$<0.5$角分内缺乏邻居不利于紫外光度均匀增强的模型，表明随机性对于解释它们的高紫外光度很重要。我们预测，以高显著性区分这些模型需要深度成像，覆盖$z=10$-$12$处$7$-$15$个亮星系（$M_{\rm UV}\lesssim-21$）周围$<1.1$角分，在$z\sim14$处降至$\lesssim5$个，能够探测到$M_{\rm UV,lim}\approx-18$以下的邻居。这些观测在JWST、Roman和Euclid巡天的能力范围内，为在我们红移前沿约束星系-暗晕联系提供了途径。
英文摘要
JWST has discovered an overabundance of UV-luminous galaxies compared to extrapolations from pre-JWST galaxy formation models. Distinguishing between proposed theoretical explanations requires constraining the halo masses of these systems, which can be probed through clustering. However, at $z>10$, low galaxy number densities render traditional clustering measurements challenging. We introduce a novel formalism that uses information about the local environments ($\lesssim$2 arcmin) of individual UV-bright galaxies at $z>10$ to test the galaxy-halo connection implied by theoretical models for the UVLF excess. We create mock JWST observations using (500 cMpc)$^3$ 21cmFAST simulations to forward-model the spatial distribution of fainter photometric candidates around UV-bright galaxies. We find that the distance to the nearest neighbor is sensitive to the stochasticity of the UV luminosity-halo mass relation, and can distinguish between models where UV luminosity is boosted uniformly in galaxies versus models with high stochasticity in UV luminosity at fixed halo mass. As a proof-of-concept, we apply our framework to observations around the two brightest confirmed galaxies at $z>10$, GN-z11 and JADES-GS-z14-0, and find that the lack of neighbors within $<0.5$ arcmin of these sources disfavors models where UV luminosity is boosted uniformly, suggesting that stochasticity is important for explaining their high UV luminosities. We forecast that distinguishing between these models at high significance requires deep imaging surveying $<1.1$ arcmin around $7$-$15$ bright galaxies ($M_{\rm UV}\lesssim-21$) at $z =10$-$12$, dropping to $\lesssim5$ at $z\sim14$, capable of detecting their neighbors down to $M_{\rm UV,lim}\approx-18$. These observations are within reach of JWST, Roman and Euclid surveys, providing a path to constraining the galaxy-halo connection at our redshift frontier.
Comments23 pages, 11 figures. Submitted to A&A. Comments welcome
