High-resolution simulations of galaxy mergers: Resolving globular cluster formation

F. Bournaud; P. -A. Duc; E. Emsellem

doi:10.1111/j.1745-3933.2008.00511.x

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arXiv · 0806.1386

High-resolution simulations of galaxy mergers: Resolving globular cluster formation

F. Bournaud·P. -A. Duc·E. Emsellem

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Abstract

Massive star clusters observed in galaxy mergers are often suggested to be progenitors of globular clusters. To study this hypothesis, we performed the highest resolution simulation of a gas-rich galaxy merger so far. The formation of massive star clusters of 10^5 to 10^7 Mo, triggered by the galaxy interaction, is directly resolved in this model. We show that these clusters are tightly bound structures with little net rotation, due to evolve into compact long-lived stellar systems. Massive clusters formed in galaxy mergers are thus robust candidates for progenitors of long-lived globular clusters. The simulated cluster mass spectrum is consistent with theory and observations. Tidal dwarf galaxies of 10^8-9 Mo can form at the same time, and appear to be part of a different class of objects, being more extended and rotating.

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F. Bournaud, P. -A. Duc, E. Emsellem. 2008-06-09. High-resolution simulations of galaxy mergers: Resolving globular cluster formation. https://doi.org/10.1111/j.1745-3933.2008.00511.x

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