论文标题
将不同红移的星系与研究星系进化
Relating galaxies across different redshift to study galaxy evolution
论文作者
论文摘要
我们提出了一个一般框架，利用统计方式在不同的红移处观察到在不同的红移处观察到的链接星系的一般框架，并使用链接推断出星系人群的红移演化。我们的基于流体动力模拟的测试表明，我们的方法可以准确地恢复恒星质量组装历史记录，最高$ z \ sim 3 $，用于当前的恒星形成和静态星系，至$ 10^{10} h^{ - 1} m _ {\ odot} $。将方法应用于观察数据表明，星系主要祖细胞的恒星质量演化在很大程度上取决于后代的特性，例如恒星质量，光晕质量和星形形成状态。自$ z \ sim 1.8 $以来，由低质量团体/光环托管的星系生长了其出色的质量$ \ sim \ sim 2.5 $ 2.5 $ 2.5 $的速度是大型群集托管的速度。对于具有相似恒星形成状态的后代星系，这种对宿主光环质量的依赖性变得较弱。自$ z \ sim 1.8 $以来，星形星系的增长速度比其静态同行快2-4倍。 TNG和Eagle模拟都过度预测了祖先恒星质量$ z> 1 $，尤其是对于低质量后代。
We propose a general framework leveraging the halo-galaxy connection to link galaxies observed at different redshift in a statistical way, and use the link to infer the redshift evolution of the galaxy population. Our tests based on hydrodynamic simulations show that our method can accurately recover the stellar mass assembly histories up to $z\sim 3$ for present star-forming and quiescent galaxies down to $10^{10}h^{-1}M_{\odot}$. Applying the method to observational data shows that the stellar mass evolution of the main progenitors of galaxies depends strongly on the properties of descendants, such as stellar mass, halo mass, and star formation states. Galaxies hosted by low-mass groups/halos at the present time have since $z\sim 1.8$ grown their stellar mass $\sim 2.5$ times as fast as those hosted by massive clusters. This dependence on host halo mass becomes much weaker for descendant galaxies with similar star formation states. Star-forming galaxies grow about 2-4 times faster than their quiescent counterparts since $z\sim 1.8$. Both TNG and EAGLE simulations over-predict the progenitor stellar mass at $z>1$, particularly for low-mass descendants.
