Evolutionary Link between Globular Clusters and Circumgalactic Clouds
/ Authors
/ Abstract
The established by us possibility to consider circumgalactic clouds (CGCs) as the remnants of the parent clouds in which globular clusters (GCs) have been formed (Acharova & Sharina 2018) is based on a comparison of the following facts. First, the metallicities of CGCs at redshifts $ z -1$ coincide within the typical error of measuring the elemental abundances in clouds: 0.3 dex (Acharova & Sharina 2018). Second, a similar coincidence is observed for GCs and CGCs with $\rm [X/H] -1$ at redshifts $ 2 <z <3 $, where $[X/H]$ is the metallicity determined from the sum of several elemental abundances (Dias et al. 2016, Rafelski et al. 2012, Wotta et al. 2019, Quiret et al. 2016). Third, high-metallicity CGCs are observed starting from redshifts $\rm z\le 2.5$, i.e. approximately 11 Gyrs ago. At the same time globular clusters were actively formed, and their supernovae were able to enrich the surrounding gas, from which the high-metal component of the clouds was formed.
Journal: GROUND-BASED ASTRONOMY IN RUSSIA. 21ST CENTURY. Proceedings of the All-Russian Conference