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Achieving convergence in galaxy formation models by augmenting N-body merger trees.

Benson, A. J. and Cannella, C. and Cole, S. (2016) 'Achieving convergence in galaxy formation models by augmenting N-body merger trees.', Computational astrophysics and cosmology., 3 . p. 3.


Accurate modeling of galaxy formation in a hierarchical, cold dark matter universe requires the use of sufficiently high-resolution merger trees to obtain convergence in the predicted properties of galaxies. When semi-analytic galaxy formation models are applied to cosmological N-body simulation merger trees, it is often the case that those trees have insufficient resolution to give converged galaxy properties. We demonstrate a method to augment the resolution of N-body merger trees by grafting in branches of Monte Carlo merger trees with higher resolution, but which are consistent with the pre-existing branches in the N-body tree. We show that this approach leads to converged galaxy properties.

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Publisher statement:© 2016 Benson et al. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Date accepted:17 August 2016
Date deposited:06 October 2016
Date of first online publication:22 August 2016
Date first made open access:No date available

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