Title: Brighter and More Massive Galaxies in the Vicinity of Lyman-alpha Nebulae Show Chinese title

Title: 附近电离氢区中的更明亮和更大质量的星系

Abstract: It has been well established in the local universe that galaxy properties differ based on the large-scale environment in which they reside. As luminous Lyman-alpha nebulae have been shown to trace overdense environments at z~2-3, comparing the properties of galaxies within Lyman-alpha nebulae systems to those in the field can provide insight into how and when locally-observed trends between galaxy properties and environment emerged. Six Lyman-alpha nebulae were discovered at z~2.3 in a blind search of the GOODS-S extragalactic field, a region also covered by the 3D-HST spectroscopic survey. Utilizing 3D-HST data, we identified 86 galaxies in the vicinity of these nebulae and used statistical tests to compare their physical properties to galaxies elsewhere in the field. Galaxies lying within 320 proper kpc of a Lyman-alpha nebula are roughly half a magnitude brighter than those in the field, with higher stellar masses, higher star formation rates, and larger effective radii. Even when considering the effects of sample incompleteness, our study suggests that galaxies in overdensities at z~2.3 traced by Lyman-alpha nebulae are being influenced by their environment. Furthermore, Lyman-alpha nebula-associated galaxies lie on the same main sequence of star formation as field galaxies, but have a larger proportion of high-mass galaxies, consistent with the idea that galaxy evolution is accelerated in rich environments. Expanded surveys for Lyman-alpha nebulae in other deep extragalactic fields and galaxy spectroscopic follow-up with JWST will better constrain the demographics of Lyman-alpha nebula-associated galaxies. Show Chinese abstract

Abstract: 在本地宇宙中已经明确建立，星系的特性取决于它们所处的大尺度环境。 由于明亮的莱曼-α星云已被证明可以追踪z~2-3时期的高密度环境，将莱曼-α星云系统中的星系特性与场区的星系进行比较，可以提供关于本地观测到的星系特性与环境之间趋势出现的时间和方式的见解。 在GOODS-S河外区域的盲搜中发现了六个z~2.3的莱曼-α星云，该区域也覆盖了3D-HST光谱调查。 利用3D-HST数据，我们在这些星云附近识别出86个星系，并使用统计检验将它们的物理特性与场区其他地方的星系进行比较。 位于莱曼-α星云320个适当千秒差距范围内的星系比场区的星系大约亮半个百分点，具有更高的恒星质量、更高的恒星形成率和更大的有效半径。 即使考虑到样本不完整的影响，我们的研究结果表明，由莱曼-α星云追踪的z~2.3时期的高密度环境中的星系正受到其环境的影响。 此外，与莱曼-α星云相关的星系位于与场区星系相同的恒星形成主序列上，但具有更高比例的高质量星系，这与富环境中的星系演化加速的观点一致。 在其他深空河外区域进行更广泛的莱曼-α星云调查，以及使用JWST进行星系光谱后续观测，将更好地限制莱曼-α星云相关星系的人口统计学特征。