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/

Zendy Plus

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

Zendy Tools

Zendy Open

The Sunyaev-Zel'dovich effect (SZE) observable-mass (Y-M) scaling relation isa promising technique for obtaining mass estimates for large samples of galaxyclusters and holds a key to studying the nature of dark matter and dark energy.However, cosmological inference based on SZE cluster surveys is limited by ourincomplete knowledge of bias, scatter, and evolution in the Y-M relation. Inthis work, we investigate the effects of galaxy cluster mergers on the scalingrelation using the Omega500 high-resolution cosmological hydrodynamicsimulation. We show that the non-thermal pressure associated withmerger-induced gas motions contributes significantly to the bias, scatter, andevolution of the scaling relation. After the merger, the kinetic energy ofmerging systems is slowly converted into thermal energy through dissipation ofturbulent gas motions, which causes the thermal SZE signal to increase steadilywith time. This post-merger evolution is one of the primary source of bias andscatter in the Y-M relation. However, we show that when the missing non-thermalenergy is accounted for, the resulting relation exhibits little to no redshiftevolution and the scatter around the scaling relation is ~20-30 % smaller thanthat of the thermal SZE signal alone. Our work opens up a possibility tofurther improve the current robust mass proxy, Y, by accounting for the missingnon-thermal pressure component. We discuss future prospect of measuringinternal gas motions in galaxy clusters and its implication for cluster-basedcosmological tests.

The Influence of Mergers on Scatter and Evolution in Sunyaev-Zel'dovich Effect Scaling Relations