We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.

Durham Research Online
You are in:

The galaxy population in cold and warm dark matter cosmologies.

Wang, L. and Gonzalez-Perez, V. and Xie, L. and Cooper, A. P. and Frenk, C. S. and Gao, L. and Hellwing, W. A. and Helly, J. and Lovell, M. R. and Jiang, L. (2017) 'The galaxy population in cold and warm dark matter cosmologies.', Monthly notices of the Royal Astronomical Society., 468 (4). pp. 4579-4591.


We use a pair of high-resolution N-body simulations implementing two dark matter models, namely the standard cold dark matter (CDM) cosmogony and a warm dark matter (WDM) alternative where the dark matter particle is a 1.5 keV thermal relic. We combine these simulations with the GALFORM semi-analytical galaxy formation model to explore differences between the resulting galaxy populations. We use GALFORM model variants for CDM and WDM that result in the same z = 0 galaxy stellar mass function by construction. We find that most of the studied galaxy properties have the same values in these two models, indicating that both dark matter scenarios match current observational data equally well. Even in underdense regions, where discrepancies in structure formation between CDM and WDM are expected to be most pronounced, the galaxy properties are only slightly different. The only significant difference in the local universe we find is in the galaxy populations of ‘Local Volumes’, regions of radius 1–8 Mpc around simulated Milky Way analogues. In such regions, our WDM model provides a better match to observed local galaxy number counts and is five times more likely than the CDM model to predict subregions within them that are as empty as the observed Local Void. Thus, a highly complete census of the Local Volume and future surveys of void regions could provide constraints on the nature of dark matter.

Item Type:Article
Full text:(VoR) Version of Record
Download PDF
Publisher Web site:
Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2017. The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
Date accepted:28 March 2017
Date deposited:18 July 2017
Date of first online publication:01 April 2017
Date first made open access:18 July 2017

Save or Share this output

Look up in GoogleScholar