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

We analyse the structures of all the clusters in the DAFT/FADA survey forwhich XMM-Newton and/or a sufficient number of galaxy redshifts in the clusterrange is available, with the aim of detecting substructures and evidence formerging events. These properties are discussed in the framework of standardcold dark matter cosmology.XMM-Newton data were available for 32 clusters, forwhich we derive the X-ray luminosity and a global X-ray temperature for 25 ofthem. For 23 clusters we were able to fit the X-ray emissivity with abeta-model and subtract it to detect substructures in the X-ray gas. Adynamical analysis based on the SG method was applied to the clusters having atleast 15 spectroscopic galaxy redshifts in the cluster range: 18 X-ray clustersand 11 clusters with no X-ray data. Only major substructures will be detected.Ten substructures were detected both in X-rays and by the SG method. Most ofthe substructures detected both in X-rays and with the SG method are probablyat their first cluster pericentre approach and are relatively recent infalls.We also find hints of a decreasing X-ray gas density profile core radius withredshift. The percentage of mass included in substructures was found to beroughly constant with redshift with values of 5-15%, in agreement both with thegeneral CDM framework and with the results of numerical simulations. Galaxiesin substructures show the same general behaviour as regular cluster galaxies;however, in substructures, there is a deficiency of both late type and oldstellar population galaxies. Late type galaxies with recent bursts of starformation seem to be missing in the substructures close to the bottom of thehost cluster potential well. However, our sample would need to be increased toallow a more robust analysis.

Structure and substructure analysis of DAFT/FADA galaxy clusters in the [0.4-0.9] redshift range