The eROSITA Final EquatorialDepth Survey (eFEDS). Xray observabletomassandredshift relations of galaxy clusters and groups with weaklensing mass calibration from the Hyper SuprimeCam Subaru Strategic Program survey
Abstract
We present the first weaklensing mass calibration and Xray scaling relations of galaxy clusters and groups selected in the eROSITA Final Equatorial Depth Survey (eFEDS) observed by Spectrum Roentgen Gamma/eROSITA over a contiguous footprint with an area of ≈140 deg^{2}, using the threeyear (S19A) weaklensing data from the Hyper SuprimeCam (HSC) Subaru Strategic Program survey. In this work, we study a sample of 434 optically confirmed galaxy clusters (and groups) at redshift 0.01 ≲ z ≲ 1.3 with a median of 0.35, of which 313 systems are uniformly covered by the HSC survey to enable the extraction of the weaklensing shear observable. In a Bayesian population modeling, we perform a blind analysis for the weaklensing mass calibration by simultaneously modeling the observed count rate η and the shear profile g_{+} of individual clusters through the countratetomassandredshift (ηM_{500}z) relation and the weaklensingmasstomassandredshift (M_{WL}M_{500}z) relation, respectively, while accounting for the bias in these observables using simulationbased calibrations. As a result, the countrateinferred and lensingcalibrated cluster mass is obtained from the joint modeling of the scaling relations, as the ensemble mass spanning a range of 10^{13}h^{1}M_{⊙} ≲ M_{500} ≲ 10^{15}h^{1}M_{⊙} with a median of ≈10^{14}h^{1}M_{⊙} for the eFEDS sample. With the mass calibration, we further model the Xray observabletomassandredshift relations, including the restframe softband and bolometric luminosity (L_{X} and L_{b}), the emissionweighted temperature T_{X}, the mass of intracluster medium M_{g}, and the mass proxy Y_{X}, which is the product of T_{X} and M_{g}. Except for L_{X} with a steeper dependence on the cluster mass at a statistically significant level, we find that the other Xray scaling relations all show a mass trend that is statistically consistent with the selfsimilar prediction at a level of ≲1.7σ. Meanwhile, all these scaling relations show no significant deviation from the selfsimilarity in their redshift scaling. Moreover, no significant redshiftdependent mass trend is present. This work demonstrates the synergy between the eROSITA and HSC surveys in preparation for the forthcoming firstyear eROSITA cluster cosmology.
 Publication:

Astronomy and Astrophysics
 Pub Date:
 May 2022
 DOI:
 10.1051/00046361/202141755
 arXiv:
 arXiv:2107.05652
 Bibcode:
 2022A&A...661A..11C
 Keywords:

 galaxies: clusters: general;
 galaxies: clusters: intracluster medium;
 gravitational lensing: weak;
 largescale structure of Universe;
 cosmology: observations;
 dark energy;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 Accepted for publication in A&