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Simulating feedback from nuclear clusters: the impact of multiple sources

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journal contribution
posted on 18.04.2016, 15:54 by Martin A. Bourne, C. Power
Nuclear star clusters (NCs) are found to exist in the centres of many galaxies and appear to follow scaling relations similar to those of supermassive black holes. Previous analytical work has suggested that such relations are a consequence of feedback-regulated growth. We explore this idea using high-resolution hydrodynamical simulations, focusing on the validity of the simplifying assumptions made in analytical models. In particular, we investigate feedback emanating from multiple stellar sources rather than from a single source, as is usually assumed, and show that collisions between shells of gas swept up by feedback leads to momentum cancellation and the formation of high-density clumps and filaments. This high-density material is resistant both to expulsion from the galaxy potential and to disruption by feedback; if it falls back on to the NC, we expect the gas to be available for further star formation or for feeding a central black hole. We also note that our results may have implications for the evolution of globular clusters and stellar clusters in high-redshift dark matter haloes.


MAB acknowledges an STFC grant and an STFC research studentship support. CP acknowledges support of ARC Discovery Project DP140100198 and an ARC Future Fellowship ARC FT130100041. This research used the DiRAC Complexity system, operated by the University of Leicester IT Services, which forms part of the STFC DiRAC HPC Facility ( This equipment is funded by BIS National Infrastructure capital grant ST/K000373/1 and STFC DiRAC Operations grant ST/K0003259/1. DiRAC is part of the UK National Infrastructure.



Monthly Notices of the Royal Astronomical Society (February 11, 2016) 456 (1): L20-L24.


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Monthly Notices of the Royal Astronomical Society (February 11


Oxford University Press (OUP), Royal Astronomical Society





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