Dark matter halo abundances, clustering and assembly histories at high redshift

Abstract

We use a suite of high-resolution N-body simulations to study the properties, abundance and clustering of high mass halos at high redshift, including their mass assembly histories and mergers. We find that the analytic form which best fits the abundance of halos depends sensitively on the assumed definition of halo mass, with common definitions of halo mass differing by a factor of two for these low concentration, massive halos. A significant number of massive halos are undergoing rapid mass accretion, with major merger activity being common. We compare the mergers and mass accretion histories to the extended Press-Schechter formalism. We consider how major merger induced star formation or black hole accretion may change the distribution of photon production from collapsed halos, and hence reionization, using some simplified examples. In all of these, the photon distribution for a halo of a given mass acquires a large scatter. If rare, high mass halos contribute significantly to the photon production rates, the scatter in photon production rate can translate into additional scatter in the sizes of ionized bubbles.

9 pages, 9 figures, resubmitted to MNRAS, added some references and convergence tests to better constrain bias

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Cited by in corpus (16)

• The growth of dark matter halos: evidence for significant smooth accretion
• Imprint of Inhomogeneous Hydrogen Reionization on the Temperature Distribution of the Intergalactic Medium
• Simulating Subhalos at High Redshift: Merger Rates, Counts, and Types
• Constraints on the correlation between QSO luminosity and host halo mass from high-redshift quasar clustering
• Cosmological HII Bubble Growth During Reionization
• Large-Scale Structure Formation: from the first non-linear objects to massive galaxy clusters
• High-redshift JWST Observations and Primordial Non-Gaussianity
• A high precision semi-analytic mass function
• Probing the first galaxies with the SKA
• The clustering of the first galaxy halos
• The abundance of dark matter haloes down to Earth mass
• Future sensitivity of neutrino telescopes to dark matter annihilations from the cosmic diffuse neutrino signal
• Gas around galaxy haloes: methodology comparisons using hydrodynamical simulations of the intergalactic medium
• Questioning Planck-selected star-forming high-redshift galaxy protoclusters and their fate
• The cusp-halo relation
• Aemulus $\nu$: Precision halo mass functions in w$\nu$CDM cosmologies