期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 445, 期 2, 页码 1713-1730出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1872
关键词
methods: analytical; methods: statistical; galaxies: formation; galaxies: haloes; cosmology: theory; dark matter
资金
- Yale Center for Astronomy Astrophysics
- National Science Foundation [AST-1202698]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1202698] Funding Source: National Science Foundation
We present a detailed study of how dark matter haloes assemble their mass and grow their (central) potential well. We characterize these via their mass accretion histories (MAHs) and potential well growth histories (PWGHs), which we extract from the Bolshoi simulation and from semi-analytical merger trees supplemented with a method to compute the maximum circular velocity, V-max, of progenitor haloes. The results of both methods are in excellent agreement, both in terms of the average and the scatter. We show that the MAH and PWGH are tightly correlated, and that growth of the central potential precedes the assembly of mass; the maximum circular velocity is already half the present-day value by the time the halo has accreted only 2 per cent of its final mass. Finally, we demonstrate that MAHs have a universal form, which we use to develop a new and improved universal model that can be used to compute the average or median MAH and PWGH for a halo of any mass in any Lambda cold dark matter cosmology, without having to run a numerical simulation or a set of halo merger trees.
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