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

The abundance of galaxy clusters is in principle a powerful tool to constraincosmological parameters, especially $\Omega_\mathrm{m}$ and $\sigma_8$, due tothe exponential dependence in the high-mass regime. While the best observablesare the X-ray temperature and luminosity, the abundance of galaxy clusters,however, is conventionally predicted as a function of mass. Hence, theintrinsic scatter and the uncertainties in the scaling relations between massand either temperature or luminosity lower the reliability of galaxy clustersto constrain cosmological parameters. In this article, we further refine theX-ray temperature function for galaxy clusters by Angrick et al., which isbased on the statistics of perturbations in the cosmic gravitational potentialand proposed to replace the classical mass-based temperature function, byincluding a refined analytic merger model and compare the theoreticalprediction to results from a cosmological hydrodynamical simulation. Althoughwe find already a good agreement if we compare with a cluster temperaturefunction based on the mass-weighted temperature, including a redshift-dependentscaling between mass-based and spectroscopic temperature yields even betteragreement between theoretical model and numerical results. As a proof ofconcept, incorporating this additional scaling in our model, we constrain thecosmological parameters $\Omega_\mathrm{m}$ and $\sigma_8$ from an X-ray sampleof galaxy clusters and tentatively find agreement with the recent cosmicmicrowave background based results from the Planck mission at 1$\sigma$-level.

Constraints on $\Omega_\mathrm{m}$ and $\sigma_8$ from the potential-based cluster temperature function