The Celestial Buffet: multiple populations and globular cluster formation in dwarf galaxies

Abstract

We present a framework that explains the commonly observed variation in light element abundances in globular clusters. If globular clusters form in the centres of dwarf galaxies, they will be pumped onto larger orbits as star formation progresses. The potential well will only retain the moderate velocity AGB ejecta, the expected source of enrichment, but not supernova ejecta. There is no need to increase the initial cluster mass, a requirement of self-enrichment scenarios, as all the stars within the dwarf can contribute. As the clusters move through the dwarf centre they sweep up a mix of AGB ejecta and in-falling pristine gas to form a second generation of stars. The specific mix will vary in time and is thus able to explain the spread in second generation abundances observed in different clusters. The globular clusters will survive to the present day or be stripped as part of the hierarchical merging process of larger galaxies. We illustrate how this process may operate using a high-resolution simulation of a dwarf galaxy at high redshift.

8 pages, 3 figures, accepted for publication in MNRAS

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Cited by in corpus (8)

• Globular clusters as the relics of regular star formation in 'normal' high-redshift galaxies
• Globular Cluster Mass Loss in the Context of Multiple Populations
• Multiple populations in globular clusters: the distinct kinematic imprints of different formation scenarios
• The Detailed Chemical Properties of M31 Star Clusters I. Fe, Alpha and Light Elements
• Formation of globular clusters with multiple stellar populations from massive gas clumps in high-z gas-rich dwarf galaxies
• Star formation within globular clusters:discrete multiple bursts and top-light mass functions
• The colour-magnitude relation of Globular Clusters in Centaurus and Hydra - Constraints on star cluster self-enrichment with a link to massive Milky Way GCs
• Different Sodium enhancements among multiple populations of Milky Way globular clusters