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

Springer Science and Business Media LLC - 2016
Andrew Benson1, Chris Cannella2, Shaun Cole3
1Carnegie Observatories, 813 Santa Barbara Street, Pasadena, CA, 91101, USA
2California Institute of Technology, 1200 E. California Blvd., Pasadena, CA, 91125, USA
3Institute for Computational Cosmology, Department of Physics, Durham University, South Road, Durham, DH1 3LE, UK

Tóm tắt

AbstractAccurate 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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