Conveners
Galaxy: evolution
- Yingjie Peng (KIAA, Peking University)
观测以及Lambda冷暗物质模型框架下的标准星系演化模型都表明星系的恒星质量与其暗物质晕质量之间密切相关：红移0处，在Lstar星系（即质量约为5x10^11太阳质量）的暗物质晕中，恒星-暗物质晕质量比达到最高（~1%-5%）。然而，最近对星系团中超弥散星系UDG的研究表明近邻宇宙中可能存在一类维里质量与Lstar星系相当，但恒星-暗物质质量比极低的星系族群，这类特殊星系又被称为未发育完全的Lstar星系（FLG）。我们通过HI动力学的方法，首次寻找到了一批高置信度的FLG星系候选体，其有着极低的恒星质量（10^7-10^9太阳质量）、巨大的暗物质晕（>5x10^11太阳质量）、以及极低的恒星-暗物质质量比（<0.1%）。FLG星系的发现否定了修正牛顿动力学（MOND）理论。此外我们还发现50%的FLG候选者位于由星系团或星系群引力主导的区域，其热气体可能在早期宇宙中受到潮汐或冲压的...
We carried out a program to identify extremely overdense structures at z~2-3 and investigate connections between galaxy and structure formation. The two very massive structures at z=2.24 are mapped with Ha emission-line galaxies, SMGs and LAEs, and exhibit astonishing features unseen before. In this talk we introduce these finding about different galaxy populations in connections with the...
Characterizing the structural properties of galaxies in high-redshift protoclusters is key to our understanding of the environmental effects on galaxy evolution in the early stages of galaxy and structure formation. We assess the structural properties of H$\alpha$ emission-line candidates (HAEs) in the densest regions of massive protoclusters at z=2-3, using HST $H$-band imaging data. Our...
A stellar system is dynamically hot when its kinetic energy is dominated by random motion represented by the velocity dispersion $\sigma_{hot}$. We use MaNGA data to obtain inner and outer dispersion of a galaxy, $\sigma_{in}$ and $\sigma_{out}$, to characterize its dynamical status and study its connection with star-formation quenching and the growth of supermassive black hole(SMBH). We...
