COLIBRE模拟中红移z≳10的詹姆斯·韦布空间望远镜（JWST）星系的后代
The descendants of $z \gtrsim 10$ JWST galaxies in the COLIBRE simulations
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中文总结 AI 辅助
本研究通过COLIBRE模拟追踪z=10的JWST明亮星系的演化，发现多数高红移星系会并入更大质量系统，存活后代多为中等至高质量星系，其现今结果对原星系质量记忆微弱，且大质量现今星系通常不源自高红移大质量天体。
中文摘要 AI 辅助
近期JWST的观测发现了一批红移z≳10的紫外明亮星系，这一发现自然引出了一个问题：这类早期星系演化到现今会变成什么？本研究利用新一代COLIBRE宇宙学流体动力学模拟，追踪红移z=10时选取的明亮星系，并将其后代演化至现今。大部分高红移星系不会作为独立的自束缚天体存活到z=0，反而会通过并合或瓦解被并入更大质量的系统中。存活下来的后代现今恒星质量范围很广，不过最常见的是中等至高质量，恒星质量M_*约为10^10至10^11太阳质量。它们通常位于星系群和星系团中，宿主晕质量M_200c约为10^13至10^14太阳质量。后代恒星质量的巨大离散表明，现今的结果对高红移原星系的恒星质量仅保留了微弱的记忆。我们发现，后代宿主晕质量的演化与扩展Press-Schechter（EPS）理论预测的前向条件分布一致，无论是在平均增长还是后代质量的巨大离散上均如此。特别是，EPS理论证实，现今的大质量星系通常并非起源于高红移时质量最大的天体。因此，观测到的z≳10星系不能被解读为某一类z=0星系的直接原星系。
英文摘要
Recent observations with JWST have revealed a population of UV-bright galaxies at $z\gtrsim 10$. This discovery naturally raises the question: what do such early galaxies evolve into by the present day? In this work, we address this descendant question using the new-generation COLIBRE cosmological hydrodynamical simulations to trace bright galaxies selected at $z=10$ and follow their descendants to the present day. Most of the high-redshift galaxies do not survive as distinct, self-bound objects to $z=0$; instead, the majority are incorporated into more massive systems through merging or disruption. The surviving descendants span a broad range of present-day stellar masses, although they are most commonly intermediate- to high-mass, $M_\star\sim10^{10}$--$10^{11} M_\odot$. They typically reside in galaxy groups and clusters, with host halo masses, $M_{200c}\sim10^{13}$--$10^{14} M_\odot$. The large scatter in descendant stellar mass shows that present-day outcomes retain only a weak memory of the stellar mass of the high-redshift progenitor. We show that the evolution of descendant host halo masses is consistent with the forward conditional distribution predicted by extended Press--Schechter (EPS) theory, both in the median growth and in the large scatter in descendant mass. In particular, EPS confirms that massive present-day galaxies typically do not originate from the most massive objects at high redshift. A galaxy observed at $z\gtrsim10$ therefore cannot be interpreted as the direct progenitor of a single class of $z=0$ galaxies.
