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

We use the NIHAO simulations to investigate the effects of baryonic physicson the time evolution of Dark Matter central density profiles. The sample ismade of $\approx 70$ independent high resolution hydrodynamical simulations ofgalaxy formation and covers a wide mass range: 1e10< Mhalo <1e12, i.e., fromdwarfs to L* . We confirm previous results on the dependence of the inner darkmatter density slope, $\alpha$, on the ratio between stellar-to-halo mass. Weshow that this relation holds approximately at all redshifts (with an intrinsicscatter of ~0.18 in $\alpha$). This implies that in practically all haloes theshape of their inner density profile changes quite substantially over cosmictime, as they grow in stellar and total mass. Thus, depending on their finalstellar-to-halo mass ratio, haloes can either form and keep a substantialdensity core (size~1 kpc), or form and then destroy the core and re-contractthe halo, going back to a cuspy profile, which is even steeper than CDMpredictions for massive galaxies (~1e12 Msun). We show that results from theNIHAO suite are in good agreement with recent observational measurements of$\alpha$ in dwarf galaxies. Overall our results suggest that the notion of auniversal density profile for dark matter haloes is no longer valid in thepresence of galaxy formation.

NIHAO IV: Core creation and destruction in dark matter density profiles across cosmic time