Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

We examine the X-ray, optical, and radio properties for members clusters of a new supercluster discovered during SRG/eROSITA Performance Verification phase. In 140 deg2 eROSITA Final Equatorial Depth Survey (eFEDS) field we detect previously unknown consisting chain eight galaxy at z=0.36. The redshifts these are determined through HSC photometric measurements. X-ray morphological dynamical properties, gas total mass out to R500 compare them with general population detected in eFEDS field. further investigate bridge region between cluster potential WHIM detection. Radio follow-up observations LOFAR uGMRT used search diffuse emission constrain dynamic state system. do not find significant differences parameters intra-cluster medium embedded this large-scale filament compared clusters. also provide upper limits on electron number density warm-hot intergalactic as provided by data. These consistent reported values detections vicinity galaxies. northern part two relics that result major merger activity early results show probe structures such superclusters their members. Our forecasts will be able 450 3000 member located eROSITA_DE final all-sky survey depth, enabling statistical studies constituents cosmic web.