Substructure of fuzzy dark matter haloes

Abstract

We derive the halo mass function (HMF) for fuzzy dark matter (FDM) by solving the excursion set problem explicitly with a mass-dependent barrier function, which has not been done before. We find that compared to the naive approach of the Sheth--Tormen HMF for FDM, our approach has a higher cut off mass and the cut off mass changes less strongly with redshifts. Using merger trees constructed with a modified version of the Lacey & Cole formalism that accounts for suppressed small scale power and the scale-dependent growth of FDM haloes and the semi-analytic GALACTICUS code, we study the statistics of halo substructure including the effects from dynamical friction and tidal stripping. We find that if the dark matter is a mixture of cold dark matter (CDM) and FDM, there will be a suppression on the halo substructure on small scales which may be able to solve the Missing Satellites Problem faced by the pure CDM model. The suppression becomes stronger with increasing FDM fraction or decreasing FDM mass. Thus, it may be used to constrain the FDM model.

12 pages, 18 figures, accepted for publication in MNRAS

References in corpus (11)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Cosmic Structure as the Quantum Interference of a Coherent Dark Wave
• Understanding the Core-Halo Relation of Quantum Wave Dark Matter, $\psi$DM, from 3D Simulations
• The redshift dependence of the structure of massive LCDM halos
• A search for ultra-light axions using precision cosmological data
• Generating Dark Matter Halo Merger Trees
• Axion dark matter, solitons, and the cusp-core problem
• A fitting formula for the merger timescale of galaxies in hierarchical clustering
• Galaxy UV-luminosity function and reionization constraints on axion dark matter
• Nonlinear evolution of dark matter subhalos and applications to warm dark matter
• Is Sextans dwarf galaxy in a scalar field dark matter halo?

Cited by in corpus (15)

• Dark matters on the scale of galaxies
• The impact of ultra-light axion self-interactions on the large scale structure of the Universe
• Ruling out 3 keV warm dark matter using 21 cm-EDGES data
• On the Power Spectrum of Dark Matter Substructure in Strong Gravitational Lenses
• Core-halo mass relation of ultralight axion dark matter from merger history
• On the Dynamical Heating of Dwarf Galaxies in a Fuzzy Dark Matter Halo
• Shadow of black hole surrounded by magnetized plasma: Axion-plasmon cloud
• Investigation of two colliding solitonic cores in Fuzzy Dark Matter models
• Black hole formation in relativistic Oscillaton collisions
• Can ultralight dark matter explain the age-velocity dispersion relation of the Milky Way disc: A revised and improved treatment
• Scalar field dark matter with a cosh potential, revisited
• Dark Matter Subhalos, Strong Lensing and Machine Learning
• The influence of dark matter halo on the stellar stream asymmetry via dynamical friction
• Perspectives on fundamental cosmology from Low Earth Orbit and the Moon
• Exploration of simple scenarios involving Fuzzy Dark Matter cores and gas at local scales