The SRG/eROSITA all-sky survey. X-ray scaling relations of galaxy groups and clusters in the western Galactic hemisphere

Abstract

The soft X-ray telescope on board the Spectrum-Roentgen-Gamma (SRG) mission, extended ROentgen Survey with an Imaging Telescope Array (eROSITA), has produced the largest sample to date of galaxy groups and clusters detected via their intracluster and intragroup medium emission. Scaling relations between the intrinsic properties of these systems provide valuable insight into their formation and evolution. In this work, we investigated the scaling relations between key physical properties, such as soft band X-ray luminosity, temperature, gas mass, and the low-scatter mass proxy Y_̊m X, for the galaxy groups and clusters detected in the first eROSITA All-Sky Survey (eRASS1). Our analysis fully accounts for selection effects and the redshift evolution of the observable distributions. We constructed a high-purity sample of 3061 galaxy groups and clusters spanning the redshift range of 0.05 3 keV, our inferred L_̊m X--T relation is consistent with simulation models that include strong or stronger AGN feedback.