Semi-analytical frameworks for subhalos from the smallest to the largest scale

Abstract

Substructures of dark matter halo, called subhalos, provide important clues to understand the nature of dark matter. We construct a useful model to describe the properties of subhalo mass functions based on the well-known analytical prescriptions, the extended Press-Schechter theory. The unevolved subhalo mass functions at arbitrary mass scales become describable without introducing free parameters. The different host halo evolution histories are directly recast to their subhalo mass functions. As applications, we quantify the effects from (i) the Poisson fluctuation, (ii) the host mass scatter, and the (iii) different tidal evolution models on observables in the current Universe with this scheme. The Poisson fluctuation dominates in the number count of the mass ratio to the host of $\sim \mathcal{O}(10^{-2})$, where the intrinsic scatter is smaller by a factor of a few. The host-mass scatter around its mean does not affect the subhalo mass function. Different models of the tidal evolution predict a factor of $\sim 2$ difference in numbers of subhalos with $\lesssim \mathcal{O}(10^{-5})$, while the dependence of the Poisson fluctuation on the tidal evolution models is subtle. The scheme provides a new tool for investigating the smallest-scale structures of our Universe which are to be observed in near future experiments.

to appear in Monthly Notices of the Royal Astronomical Society

References in corpus (12)

• Generating Dark Matter Halo Merger Trees
• Dark Matter Substructure in Numerical Simulations: A Tale of Discreteness Noise, Runaway Instabilities, and Artificial Disruption
• What mass are the smallest protohalos?
• The Population of Dark Matter Subhaloes: Mass Functions and Average Mass Loss Rates
• Hierarchical Formation of Dark Matter Halos and the Free Streaming Scale
• Scattering, Damping, and Acoustic Oscillations: Simulating the Structure of Dark Matter Halos with Relativistic Force Carriers
• The statistical properties of LCDM halo formation
• Analytical Approach to Subhaloes Population in Dark Matter Haloes
• The tidal evolution of dark matter substructure -- I. Subhalo density profiles
• Detectability of Small-Scale Dark Matter Clumps with Pulsar Timing Arrays
• Merger history trees of dark matter haloes in moving barrier models
• Mass distribution and accretion of sub-halos

Cited by in corpus (3)

• SASHIMI-SIDM: Semi-analytical subhalo modelling for self-interacting dark matter at sub-galactic scales
• Searching for dark matter subhalos in the Fermi-LAT catalog with Bayesian neural networks
• Comparison of simulations and semi-analytical model for WDM subhalo mass functions