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Cluster Creation in a Cosmological Context

27 Nov 2018, 17:50 UTC
Cluster Creation in a Cosmological Context
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Today’s guest post was written by Heitor Ernandes, a PhD student in the Universidade de São Paulo. He is currently doing research about chemical enrichment and nucleosynthesis in the Milky Way with a particular interest in the Galactic Bulge and globular clusters. In his free time usually he likes to play rugby and run.Title: The origin of Milky Way globular clustersAuthors: Florent Renaud; Oscar Agertz and Mark GielesFirst Author’s Institution: Department of Physics, University of Surrey, Guildford GU2 7XH, UKStatus: Published in the Monthly Notices of the Royal Astronomical Society (MNRAS), open access on arXiv
Figure 1. Galactic structure of a spiral galaxy, similar to the MW Credit: Pearson Education Inc.

IntroductionGlobular clusters consist of around 10,000 to 10,000,000 (Omega Cen) stars, which are tightly bound by gravity. Their structure makes us expect that they were born in a single star formation event (not entirely true though, they can show multiple stellar populations). This means that a globular cluster would have formed from a single gas cloud at the same time in the early Universe in the highest density peaks. Globular clusters can be generally separated in two groups—the blue and the red clusters—with regard to their color and metallicity. ...

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