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

We use the weak gravitational lensing effect to study the mass distributionand dynamical state of a sample of 24 X-ray luminous clusters of galaxies($0.05<z<0.31$) observed with the VLT-FORS1 under homogeneous sky conditionsand subarsecond image quality. The galaxy shapes were measured afterdeconvolution with a locally determined point-spread-function, while thetwo-dimensional mass distributions of the clusters were computed using analgorithm based on the maximum entropy method. By comparing the mass and lightdistributions of the clusters in our sample, we find that their mass centers,for the majority of the clusters, is consistent with the positions of opticalcenters. We find that some clusters present significant mass substructureswhich generally have optical counterparts. At least in one cluster (Abell1451), we detect a mass substructure without an obvious luminous counterpart.The radial profile of the shear of the clusters was fitted using circular andelliptical isothermal elliptical distributions, which allowed the finding of astrong correlation between the orientation of the major-axis of the matterdistribution and the corresponding major-axes of the brightest cluster galaxylight-profiles. Estimates of how close to dynamical relaxation are theseclusters were obtained through comparison of our weak-lensing mass measurementswith the x-ray and velocity dispersion determinations available in theliterature. We find that clusters with intra-cluster gas colder than 8 keV showa good agreement between the different mass determinations, but clusters withgas hotter than 8 keV present discrepant mass values.

Address

About

Learn

Download the Zendy App

Discover

Explore