Journal article

The accretion history of dark matter haloes - I. The physical origin of the universal function

Camila A Correa, J Stuart B Wyithe, Joop Schaye, Alan R Duffy

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | OXFORD UNIV PRESS | Published : 2015

Abstract

Understanding the universal accretion history of dark matter haloes is the first step towards determining the origin of their structure. We use the extended Press-Schechter formalism to derive the halo mass accretion history from the growth rate of initial density perturbations. We show that the halo mass history is well described by an exponential function of redshift in the high-redshift regime. However, in the low-redshift regime the mass history follows a power law because the growth of density perturbations is halted in the dark energy dominated era due to the accelerated expansion of the Universe. We provide an analytic model that follows the expression M(z) = M0(1 + z)af (M0)e-f (M0)z..

View full abstract

University of Melbourne Researchers

Grants

Awarded by European Research Council under the European Union/ERC


Funding Acknowledgements

We are grateful to the referee Aaron Ludlow for fruitful comments that substantially improved the original manuscript. CAC acknowledges the support of the 2013 John Hodgson Scholarship and the hospitality of Leiden Observatory. JSBW is supported by an Australian Research Council Laureate Fellowship. JS acknowledges support by the European Research Council under the European Union's Seventh Framework Programme (FP7/2007-2013)/ERC Grant agreement 278594-GasAroundGalaxies. We are grateful to the OWLS team for their help with the simulations.