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 have initiated a program to study the baryon content and dynamic state ofgalaxy clusters. Here we present results primarily from XMM-Newton observationsof two optically-selected galaxy clusters, A1095 ($z \simeq 0.210$) and A1926($z \simeq 0.136$). We find that both of them are actually cluster pairs atsimilar redshifts. We characterize the temperatures of these individualclusters through X-ray spectral fits and then estimate their gravitationalmasses. We show a rich set of substructures, including large position offsetsbetween the diffuse X-ray centroids and the brightest galaxies of the clusters,which suggests that they are dynamically young. For both A1095 and A1926, wefind that the mass required for the cluster pairs to be bound is smaller thanthe total gravitational mass. Thus both cluster pairs appear to be ongoingmajor mergers. Incorporating SDSS and NVSS/FIRST data, we further examine thelarge-scale structure environment and radio emission of the clusters to probetheir origins, which also leads to the discovery of two additionalX-ray-emitting clusters ($z \simeq 0.097$ and $z \simeq 0.147$) in the field ofA1926. We estimate the hot gas and stellar masses of each cluster, whichcompared with the expected cosmological baryonic mass fraction, leave ampleroom for warm gas.

Baryon content and dynamic state of galaxy clusters: XMM-Newton observations of A1095 and A1926