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Analytic and numerical realizations of a disc galaxy

Stringer, M. J. and Brooks, A. M. and Benson, A. J. and Governato, F. (2010) Analytic and numerical realizations of a disc galaxy. Monthly Notices of the Royal Astronomical Society, 407 (1). pp. 632-644. ISSN 0035-8711. doi:10.1111/j.1365-2966.2010.16944.x.

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Recent focus on the importance of cold, unshocked gas accretion in galaxy formation – not explicitly included in semi-analytic studies – motivates the following detailed comparison between two inherently different modelling techniques: direct hydrodynamical simulation and semi-analytic modelling. By analysing the physical assumptions built into the gasoline simulation, formulae for the emergent behaviour are derived which allow immediate and accurate translation of these assumptions to the galform semi-analytic model. The simulated halo merger history is then extracted and evolved using these equivalent equations, predicting a strikingly similar galactic system. This exercise demonstrates that it is the initial conditions and physical assumptions which are responsible for the predicted evolution, not the choice of modelling technique. On this level playing field, a previously published galform model is applied (including additional physics such as chemical enrichment and feedback from active galactic nuclei) which leads to starkly different predictions.

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Benson, A. J.0000-0001-5501-6008
Additional Information:© 2010 The Authors. Journal compilation © 2010 RAS. Accepted 2010 April 26. Received 2010 April 23; in original form 2009 August 24. Article first published online: 15 July 2010. The authors would primarily like to thank the KITP, Santa Barbara, for their hospitality, supported in part by the National Science Foundation under Grant No. PHY05-51164, without which this interdisciplinary study would not have taken place. AMB acknowledges support from the Sherman Fairchild Foundation. AJB acknowledges support from the Gordon & Betty Moore Foundation. FG acknowledges support from the HST GO-1125, NSF AST-0607819 and NASA ATP NNX08AG84G grants. Thanks go to Richard Bower, Shaun Cole and Carlos Frenk for their very helpful comments. Also, they and their colleagues Carlton Baugh, John Helly, Cedric Lacey and Rowena Malbon allowed us to use the GALFORM semi-analytic model of galaxy formation ( in this work, for which we are extremely grateful.
Group:Moore Center for Theoretical Cosmology and Physics
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Sherman Fairchild FoundationUNSPECIFIED
Gordon and Betty Moore FoundationUNSPECIFIED
Subject Keywords:methods: analytical; methods: numerical; galaxies: evolution ; galaxies: formation
Issue or Number:1
Record Number:CaltechAUTHORS:20100915-094131397
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Official Citation:M. J. Stringer, A. M. Brooks, A. J. Benson, and F. Governato Analytic and numerical realizations of a disc galaxy MNRAS (2010) Vol. 407 632-644 doi:10.1111/j.1365-2966.2010.16944.x First published online September 1, 2010
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19969
Deposited On:15 Sep 2010 17:52
Last Modified:08 Nov 2021 23:56

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