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 present the results from the dynamical analysis of the cluster of galaxies RXJ0152.7−1357, which shows a complex structure in its X-ray\udemission, with two major clumps in the central region and a third clump in the Eastern region. Our analysis is based on redshift data for\ud187 galaxies. We find that RXJ0152.7−1357 appears as a well isolated peak in the redshift space at z = 0.836, which includes 95 galaxies\udrecognized as cluster members. We compute the line-of-sight velocity dispersion of galaxies, σV = 1322+74\ud−68 km s−1, which is significantly\udlarger than what is expected in the case of a relaxed cluster with an observed X-ray temperature of 5-6 keV. We find evidence that this cluster\udis far from dynamical equilibrium, as shown by the non Gaussianity of the velocity distribution, the presence of a velocity gradient and a\udsignificant substructure. Our analysis shows that the high value of σV is due to the complex structure of RXJ0152.7−1357, i.e. to the presence\udof three galaxy clumps of different mean velocities. Using optical data we detect a low-velocity clump (with σV = 300–500 km s−1) in the\udcentral southwest region and a high-velocity clump (with σV ∼ 700 km s−1) in the Eastern region, corresponding well to the South–West and\udEast peaks detected in the X-ray emission. The central North–East X-ray peak is associated to the main galaxy structure with a velocity which\udis intermediate between those of the other two clumps and σV ∼ 900 km s−1. The mass of the whole system within 2 Mpc is estimated to lie\udin the range (1.2−2.2) × 1015 M, depending on the model adopted to describe the cluster dynamics. Such values are comparable to those of\udvery massive clusters at lower redshifts. Analytic calculations based on the two-body model indicate that the system is most likely bound and\udcurrently undergoing merging. In particular, we suggest that the southwestern clump is not a small group, but rather the dense cluster-core of a\udmassive cluster, most likely destined to survive tidal disruption during the merger

Internal dynamics of thez ~ 0.8 cluster RX J0152.7-1357