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 seek to explore the internal dynamics of the cluster Abell 1758N, whichhas been shown to host a radio halo and two relics, and is known to be amerging bimodal cluster. Our analysis is mainly based on new redshift data for137 galaxies acquired at the Telescopio Nazionale Galileo, only four of whichhave redshifts previously listed in the literature. We also used photometricdata from the Sloan Digital Sky Survey and from the Canada-France-HawaiiTelescope archive. We combined galaxy velocities and positions to select 92cluster galaxies and analyzed the internal cluster dynamics. We estimate acluster redshift of <z>=0.2782 and quite a high line-of-sight (LOS) velocitydispersion of ~ 1300 km/s. Our 2D analysis confirms the presence of a bimodalstructure along the NW-SE direction. We add several pieces of information tothe previous merging scenario: the two subclusters (here A1758N(NW) andA1758N(SE)) cannot be separated in the velocity analyses and we deduce a smallLOS velocity difference of ~300 km/s in the cluster rest-frame. The velocityinformation successfully shows that A1758N is surrounded by two small groupsand active galaxies infalling onto, or escaping from, the cluster. Removing thetwo groups, we estimate ~1000 km/s and ~800 km/s for the velocity dispertionsof A1758N(NW) and A1758N(SE), respectively. We find that Abell 1758N is a verymassive cluster with a range of M=2-3 10^15 solar masses, depending on theadopted model. As expected for clusters that host powerful, extended, diffuseradio emissions, Abell 1758N is a major cluster merger just forming a massivesystem.

Abell 1758N from an optical point of view: new insights on a merging cluster with diffuse radio emission