Science News内容：

题目：How do galaxies form Spheroids?

摘要：Using ALMA to survey 146 sub-millimeter bright galaxies, Qinghua Tan et al. was able to probe the evolution history of spheroids in galaxies and uncover the secrets of star forming burst at cosmic noon.

报告人：薛海坤（紫台实习生） 

Journal club内容：

题目：Cosmic Vine: A z = 3.44 large-scale structure hosting massive quiescent galaxies

摘要：We report the discovery of a large-scale structure at z = 3.44 revealed by JWST data in the Extended Groth Strip (EGS) fifield. This structure, called the Cosmic Vine, consists of 20 galaxies with spectroscopic redshifts at 3.43 < z < 3.45 and six galaxy overdensities (4−7σ) with consistent photometric redshifts, making up a vine-like structure extending over a ∼4 × 0.2 pMpc2 area. The two most massive galaxies of the Cosmic Vine are found to be quiescent with bulge-dominated morphologies (B/T > 70%). Comparisons with simulations suggest that the Cosmic Vine would form a cluster at z = 0, and the two massive galaxies are likely forming the brightest cluster galaxies (BCGs). The results unambiguously reveal that massive quiescent galaxies can form in growing large-scale structures at z > 3, thus disfavoring the environmental quenching mechanisms that require a virialized cluster core. Instead, as suggested by the interacting and bulge-dominated morphologies, the two galaxies are likely quenched by merger-triggered starburst or active galactic nucleus (AGN) feedback before falling into a cluster core.

报告人： 彭昊（紫台研究生）

时间：2024年12月17日星期二12:15

地点：紫台3-302