论文标题
鹰模拟的星系中质量，金属性和形态之间的相关性的起源
The origin of correlations between mass, metallicity and morphology in galaxies from the EAGLE simulation
论文作者
论文摘要
观察和模拟星系在恒星质量，金属性和形态之间表现出相关性。 We use the EAGLE cosmological simulation to examine the origin of these correlations for galaxies in the stellar mass range $10^9~\rm{M_\odot} \leqslant\ M_\star \leqslant 10^{10}~\rm{M_\odot}$, and the extent to which they contribute to the scatter in the mass-metallicity relation.我们发现，与以前的发现一致，旋转支持的圆盘星系的金属性低于给定质量的分散球形星系。在Eagle中，出现这种相关性是因为圆盘在以后的时间形成星星，红移$ z \ leqslant 1 $，来自低金属气体的积聚，而球形星系星系通常会早些时候形成星星，主要是通过消耗其气体储层。不同的行为反映了其宿主暗物质光环的生长：在给定的恒星质量下，圆盘星系居住在暗物质光环中，质量较低，与球形星系的光环相比，后来形成。光环浓度起次要作用。
Observed and simulated galaxies exhibit correlations between stellar mass, metallicity and morphology. We use the EAGLE cosmological simulation to examine the origin of these correlations for galaxies in the stellar mass range $10^9~\rm{M_\odot} \leqslant\ M_\star \leqslant 10^{10}~\rm{M_\odot}$, and the extent to which they contribute to the scatter in the mass-metallicity relation. We find that rotationally supported disc galaxies have lower metallicity than dispersion supported spheroidal galaxies at a given mass, in agreement with previous findings. In EAGLE, this correlation arises because discs form stars at later times, redshift $z\leqslant 1$, from the accretion of low-metallicity gas, whereas spheroidal galaxies galaxies typically form stars earlier, mainly by consumption of their gas reservoir. The different behaviour reflects the growth of their host dark matter halo: at a given stellar mass, disc galaxies inhabit dark matter haloes with lower mass that formed later compared to the haloes of spheroidal galaxies. Halo concentration plays a secondary role.
