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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Accurate cosmology from upcoming weak lensing surveys relies on knowledge ofthe total matter power spectrum at percent level at scales $k < 10$ $h$/Mpc,for which modelling the impact of baryonic physics is crucial. We comparemeasurements of the total matter power spectrum from the Horizon cosmologicalhydrodynamical simulations: a dark matter-only run, one with full baryonicphysics, and another lacking Active Galactic Nuclei (AGN) feedback. Baryonscause a suppression of power at $k\simeq 10$ $h/$Mpc of $<15\%$ at $z=0$, andan enhancement of a factor of a few at smaller scales due to the more efficientcooling and star formation. The results are sensitive to the presence of thehighest mass haloes in the simulation and the distribution of dark matter isalso impacted up to a few percent. The redshift evolution of the effect isnon-monotonic throughout $z=0-5$ due to an interplay between AGN feedback andgas pressure, and the growth of structure. We investigate the effectiveness ofan analytic `baryonic correction model' in describing our results. We require adifferent redshift evolution and propose an alternative fitting function with$4$ free parameters that reproduces our results within $5\%$. Compared to othersimulations, we find the impact of baryonic processes on the total matter powerspectrum to be smaller at $z=0$. Correspondingly, our results suggest that AGNfeedback is not strong enough in the simulation. Total matter power spectrafrom the Horizon simulations are made publicly available athttps://www.horizon-simulation.org/catalogues.html

The impact of baryons on the matter power spectrum from the Horizon-AGN cosmological hydrodynamical simulation