English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Dark matter halo demographics and assembly histories are a manifestation ofcosmological structure formation and have profound implications for theformation and evolution of galaxies. In particular, merger trees providefundamental input for several modelling techniques, such as semi-analyticmodels (SAMs), sub-halo abundance matching (SHAM), and decorated halooccupation distribution models (HODs). Motivated by the new ultra-high-redshift(z > 10) frontier enabled by JWST, we present a new suite of Gadget atUltrahigh Redshift with Extra-Fine Timesteps (GUREFT) dark matter-onlycosmological simulations that are carefully designed to capture halo mergerhistories and structural properties in the ultra-z universe. The simulationsuite consists of four 1024^3-particle simulations with box sizes of 5, 15, 35,and 90 Mpc h-1, each with 170 snapshots stored between 40 > z > 6. With theunprecedented number of available snapshots and strategically chosen dynamicrange covered by these boxes, gureft uncovers the emerging dark matter halopopulations and their assembly histories in the earliest epochs of cosmichistory. In this work, we present the halo mass functions between z ~ 20 to 6down to log(Mvir/Msun) ~ 5, and show that at high redshift, these robust halomass functions can differ substantially from commonly used analyticapproximations or older fitting functions in the literature. We also presentkey physical properties of the ultra-z halo population, such as concentrationand spin, as well as their mass growth and merger rates, and again provideupdated fitting functions.

Characterising ultra-high-redshift dark matter halo demographics and assembly histories with the GUREFT simulations