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| Paper: |
Mass Loaded Outflows from Emission-Line Clusters in the Antennae Galaxies |
| Volume: |
322, The Formation and Evolution of Massive Young Star Clusters |
| Page: |
185 |
| Authors: |
Gilbert, A.M.; Graham, J.R. |
| Abstract: |
The youngest super star clusters (SSCs) in the merging Antennae Galaxies (NGC 4038/39) drive supersonic mass-loaded outflows from the HII regions in which they are embedded. High-resolution Keck/NIRSPEC spectroscopy reveals broad, spatially extended Brγ emission in 16 targets. Simple wind models for the line profiles provide good fits and imply cluster mass-loss rates spanning two orders of magnitude (0.01 − 1 MSolar yr−1) and terminal velocities less than 200 km s−1. The emission-line clusters (ELCs) that drive these outflows constitute at least 15% of the star-formation rate in the Antennae, and their high star-formation efficiencies imply that they will likely evolve into bound SSCs. Comparison with population synthesis predictions suggests that the youngest ELC outflows, which are driven primarily by stellar winds, very efficiently entrain ambient matter. These mass-loaded cluster winds transfer or dissipate a large fraction of their energy and momentum in a coronal or cool medium that does not emit Brγ
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