Formation times and masses of dark matter haloes

Abstract

The most commonly used definition of halo formation is the time when a halo's most massive progenitor first contains at least half the final mass of its parent. Reasonably accurate formulae for the distribution of formation times of haloes of fixed mass have been available for some time. We use numerical simulations of hierarchical gravitational clustering to test the accuracy of formulae for the mass at formation. We also derive and test a formula for the joint distribution of formation masses and times. The structure of a halo is expected to be related to its accretion history. Our tests show that our formulae for formation masses and times are reasonably accurate, so we expect that they will aid future analytic studies of halo structure.

5 pages, 5 figures, MNRAS, in press

References in corpus (2)

• Mass and Redshift Dependence of Dark Halo Structure
• Formation time distribution of dark matter haloes: theories versus N-body simulations

Cited by in corpus (34)

• Large-Scale Galaxy Bias
• The Population of Dark Matter Subhaloes: Mass Functions and Average Mass Loss Rates
• Galaxy Merger Statistics and Inferred Bulge-to-Disk Ratios in Cosmological SPH Simulations
• The Substructure Hierarchy in Dark Matter Haloes
• The accretion history of dark matter halos II: The connections with the mass power spectrum and the density profile
• An improved model for the formation times of dark matter haloes
• Turbulence production and turbulent pressure support in the intergalactic medium
• Simulations of Baryon Oscillations
• Baryon oscillations
• A general explanation on the correlation of dark matter halo spin with the large scale environment
• Galaxy clustering from COMBO-17: The halo occupation distribution at <z>=0.6
• The Formation Histories of Galaxy Clusters
• Baryonic Conversion Tree: The global assembly of stars and dark matter in galaxies from the SDSS
• Is the Number of Giant Arcs in LCDM Consistent With Observations?
• Spin flips I: Evolution of the angular momentum orientation of Milky Way-mass dark matter haloes
• MOKA: a new tool for Strong Lensing Studies
• Empirical constraints on the formation of early-type galaxies
• An analytical model for the accretion of dark matter subhalos
• Cosmology in 2D: the concentration-mass relation for galaxy clusters
• Fast Weak Lensing Simulations with Halo Model
• The mass accretion rate of galaxy clusters: a measurable quantity
• Characterizing dark interactions with the halo mass accretion history and structural properties
• Neural physical engines for inferring the halo mass distribution function
• Are Faint Supernovae Responsible for Carbon-Enhanced Metal-Poor Stars?
• How do galaxies populate halos in extreme density environments? An analysis of the Halo Occupation Distribution in SDSS
• A Merger Tree with Microsolar Mass Resolution: Application to $\gamma$-ray Emission from Subhalo Population
• Merger history trees of dark matter haloes in moving barrier models
• Oxygen pumping II: Probing the Inhomogeneous Metal Enrichment at the Epoch of Reionization with High Frequency CMB Observations
• On the Environmental Dependence of Galaxy Properties Established by the Initial Cosmological Conditions
• Galaxy populations in haloes in high-density environments
• Halo Growth and Merger Rates as a Cosmological Test
• Testing the Reliability of Fast Methods for Weak Lensing Simulations: WL-MOKA on PINOCCHIO
• Cosmological Signatures of Dark Sector Physics: The Evolution of Haloes and Spin Alignment
• Controlled Experiments on Dark-Matter Halo Structure and Galaxy Morphology I: What Sets Galaxy Sizes?