Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 474, Issue 1, Pages 45-54Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stx2744
Keywords
methods: numerical; galaxies: evolution; galaxies: formation; dark matter
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Funding
- Perren Fund
- IMPACT fund
- Royal Society
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Recent work has studied the interplay between a galaxy's history and its observable properties using 'genetically modified' cosmological zoom simulations. The approach systematically generates alternative histories for a halo, while keeping its cosmological environment fixed. Applications to date altered linear properties of the initial conditions, such as the mean overdensity of specified regions; we extend the formulation to include quadratic features, such as local variance, that determines the overall importance of smooth accretion relative to mergers in a galaxy's history. We introduce an efficient algorithm for this new class of modification and demonstrate its ability to control the variance of a region in a one-dimensional toy model. Outcomes of this work are twofold: (i) a clarification of the formulation of genetic modifications and (ii) a proof of concept for quadratic modifications leading the way to a forthcoming implementation in cosmological simulations.
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