论文标题
h $ _2 $中间红移簇内外星系的内容
H$_2$ content of galaxies inside and around intermediate redshift clusters
论文作者
论文摘要
密集的环境对星系的恒星形成率有影响。 As stars form from molecular gas, looking at the cold molecular gas content of a galaxy gives useful insights on its efficiency in forming stars.但是，在中间红移的CO（冷分子气体含量的代理）中观察到的大多数星系是场星系。只有少数研究集中在星系星系上。我在EDISCS调查中以$ z \ sim0.5 $中的一个中等质量集群的环境提出了新的结果。选择了27个形成星系的星系，以均匀地采样集群内部和周围遇到的密度范围。我们覆盖了从簇中心延伸至8个病毒半径的区域。确实，有充分的证据表明，恒星形成淬火已经开始超过3个簇病毒半径。我讨论了我们的CO（3-2）ALMA观察结果，该观察结果揭示了很大一部分气体与恒星质量比的星系。
Dense environments have an impact on the star formation rate of galaxies. As stars form from molecular gas, looking at the cold molecular gas content of a galaxy gives useful insights on its efficiency in forming stars. However, most galaxies observed in CO (a proxy for the cold molecular gas content) at intermediate redshifts, are field galaxies. Only a handful of studies focused on cluster galaxies. I present new results on the environment of one medium mass cluster from the EDisCS survey at $z\sim0.5$. 27 star-forming galaxies were selected to evenly sample the range of densities encountered inside and around the cluster. We cover a region extending as far as 8 virial radii from the cluster center. Indeed there is ample evidence that star formation quenching starts already beyond 3 cluster virial radius. I discuss our CO(3-2) ALMA observations, which unveil a large fraction of galaxies with low gas-to-stellar mass ratios.
