J. Han
A unified model for the spatial and mass distribution of subhaloes
Han, J.; Cole, S.; Frenk, C.S.; Jing, Y.
Authors
Professor Shaun Cole shaun.cole@durham.ac.uk
Director of the Institute for Computational Cosmology
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Y. Jing
Abstract
N-body simulations suggest that the substructures that survive inside dark matter haloes follow universal distributions in mass and radial number density. We demonstrate that a simple analytical model can explain these subhalo distributions as resulting from tidal stripping which increasingly reduces the mass of subhaloes with decreasing halocentric distance. As a starting point, the spatial distribution of subhaloes of any given infall mass is shown to be largely indistinguishable from the overall mass distribution of the host halo. Using a physically motivated statistical description of the amount of mass stripped from individual subhaloes, the model fully describes the joint distribution of subhaloes in final mass, infall mass and radius. As a result, it can be used to predict several derived distributions involving combinations of these quantities including, but not limited to, the universal subhalo mass function, the subhalo spatial distribution, the gravitational lensing profile, the dark matter annihilation radiation profile and boost factor. This model clarifies a common confusion when comparing the spatial distributions of galaxies and subhaloes, the so-called anti-bias, as a simple selection effect. We provide a PYTHON code SUBGEN for populating haloes with subhaloes at http://icc.dur.ac.uk/data/.
Citation
Han, J., Cole, S., Frenk, C., & Jing, Y. (2016). A unified model for the spatial and mass distribution of subhaloes. Monthly Notices of the Royal Astronomical Society, 457(2), 1208-1223. https://doi.org/10.1093/mnras/stv2900
Journal Article Type | Article |
---|---|
Acceptance Date | Dec 8, 2015 |
Online Publication Date | Feb 2, 2016 |
Publication Date | Apr 1, 2016 |
Deposit Date | Apr 5, 2016 |
Publicly Available Date | Apr 7, 2016 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 457 |
Issue | 2 |
Pages | 1208-1223 |
DOI | https://doi.org/10.1093/mnras/stv2900 |
Public URL | https://durham-repository.worktribe.com/output/1407755 |
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Copyright Statement
This article has been published in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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