%0 Journal Article
%T Probing the azimuthal environment of galaxies around clusters - From cluster core to cosmic filaments
%A C. Gouin
%A M. Douspis
%A N. Aghanim
%A V. Bonjean
%J -
%D 2020
%R 10.1051/0004-6361/201937218
%X Galaxy clusters are connected at their peripheries to the large-scale structures by cosmic filaments that funnel accreting material. These filamentary structures are studied to investigate both environment-driven galaxy evolution and structure formation and evolution. In the present work, we probe in a statistical manner the azimuthal distribution of galaxies around clusters as a function of the cluster-centric distance, cluster richness, and star-forming or passive galaxy activity. We performed a harmonic decomposition in large photometric galaxy catalogue around 6400 SDSS clusters with masses <i>M<i/>£¿> £¿10<sup>14<sup/> solar masses in the redshift range of 0.1£¿< £¿<i>z<i/>£¿< £¿0.3. The same analysis was performed on the mock galaxy catalogue from the light cone of a Magneticum hydrodynamical simulation. We used the multipole analysis to quantify asymmetries in the 2D galaxy distribution. In the inner cluster regions at <i>R<i/>£¿< £¿2<i>R<i/><sub>500<sub/>, we confirm that the galaxy distribution traces an ellipsoidal shape, which is more pronounced for richest clusters. In the outskirts of the clusters (<i>R<i/>£¿=£¿[2£¿£¿£¿8]<i>R<i/><sub>500<sub/>), filamentary patterns are detected in harmonic space with a mean angular scale <i>m<i/><sub>mean<sub/>£¿=£¿4.2£¿¡À£¿0.1. Massive clusters seem to have a larger number of connected filaments than lower-mass clusters. We also find that passive galaxies appear to trace the filamentary structures around clusters better. This is the case even if the contribution of star-forming galaxies tends to increase with the cluster-centric distance, suggesting a gradient of galaxy activity in filaments around clusters
%U https://www.aanda.org/articles/aa/full_html/2020/03/aa37218-19/aa37218-19.html