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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

To explain the unusual richness and compactness of the Abell 2744, we proposea hypothesis that it may be a rich supercluster aligned along the sightline,and present a supporting evidence obtained numerically from the MultiDarkPlanck 2 simulations with a linear box size of $1\,h^{-1}$Gpc. Applying thefriends-of-friends (FoF) algorithm with a linkage length of $0.33$ to a sampleof the cluster-size halos from the simulations, we identify the superclustersand investigate how many superclusters have filamentary branches that wouldappear to be similar to the Abell 2744 if the filamentary axis is aligned withthe sightline. Generating randomly a unit vector as a sightline at the positionof the core member of each supercluster and projecting the positions of themembers onto the plane perpendicular to the direction of the sightline, wemeasure two dimensional distances ($R_{2d}$) of the member halos from the corefor each supercluster. Defining a Abell 2744-like spuercluster as the onehaving a filamentary branch composed of eight or more members with $R_{2d}\le1\,$Mpc and masses comparable to those of the observed Abell 2744substructures, we find one Abell 2744-like supercluster at $z=0.3$ and two at$z=0$. Repeating the same analysis but with the data from the Big MultiDarkPlanck simulations performed on a larger box of linear size of$2.5\,h^{-1}$Mpc, we find that the number of the Abell 2744-like superclustersat $z=0$ increases up to eighteen, among which three are found more massivethan $5\times 10^{15}\,M_{\odot}$.

Abell 2744 may be a supercluster aligned along the sightline