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The eFEDS survey is a proof-of-concept mini-survey designed to demonstratethe survey science capabilities of SRG/eROSITA. It covers an area of 140 squaredegrees where 542 galaxy clusters have been detected out to a redshift of 1.3.The eFEDS field is partly embedded in the Hyper Suprime-Cam Subaru StrategicProgram (HSC-SSP) S19A data release, which covers 510 square degrees,containing approximately 36 million galaxies. This galaxy catalogue is used toconstruct a sample of 180 shear-selected galaxy clusters. In the common area toboth surveys, about 90 square degrees, we investigate the effects of selectionmethods in the galaxy cluster detection by comparing the X-ray selected, eFEDS,and the shear-selected, HSC-SSP S19A, galaxy cluster samples. There are 25shear-selected clusters in the eFEDS footprint. The relation between X-raybolometric luminosity and weak-lensing mass is investigated, and it is foundthat the normalization of the bolometric luminosity and mass relation of theX-ray selected and shear-selected samples is consistent within $1\sigma$.Moreover, we found that the dynamical state and merger fraction of theshear-selected clusters is not different from the X-ray selected ones. Fourshear-selected clusters are undetected in X-rays. A close inspection revealsthat one is the result of projection effects, while the other three have anX-ray flux below the ultimate eROSITA detection limit. Finally, 43% of theshear-selected clusters lie in superclusters. Our results indicate that thescaling relation between X-ray bolometric luminosity and true cluster mass ofthe shear-selected cluster sample is consistent with the eFEDS sample. There isno significant population of X-ray underluminous clusters, indicating thatX-ray selected cluster samples are complete and can be used as an accuratecosmological probe.

astronomy and astrophysics

The eROSITA Final Equatorial-Depth Survey (eFEDS): A complete census of  X-ray properties of Subaru Hyper Suprime-Cam weak lensing shear-selected  clusters in the eFEDS footprint