The eROSITA Final Equatorial-Depth Survey (eFEDS) X-ray observable-to-mass-and-redshift relations of galaxy clusters and groups with weak-lensing mass calibration from the Hyper Suprime-Cam Subaru Strategic Program survey

Ghirardini, Vittorio; Bahar, Y. Emre; Bulbul, Esra; Liu, Ang; Clerc, Nicolas; Pacaud, Florian; Comparat, Johan; Liu, Teng; Ramos-Ceja, Miriam E.; Hoang, Duy; Ider-Chitham, Jacob; Klein, Matthias; Merloni, Andrea; Nandra, Kirpal; Ota, Naomi; Predehl, Peter; Reiprich, Thomas H.; Sanders, Jeremy und Schrabback, Tim (2022): The eROSITA Final Equatorial-Depth Survey (eFEDS) X-ray observable-to-mass-and-redshift relations of galaxy clusters and groups with weak-lensing mass calibration from the Hyper Suprime-Cam Subaru Strategic Program survey. In: Astronomy & Astrophysics, Bd. 661, A12

Abstract

We present the first weak-lensing mass calibration and X-ray 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 approximate to 140 deg(2), using the three-year (S19A) weak-lensing data from the Hyper Suprime-Cam (HSC) Subaru Strategic Program survey. In this work, we study a sample of 434 optically confirmed galaxy clusters (and groups) at redshift 0.01 less than or similar to z less than or similar to 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 weak-lensing shear observable. In a Bayesian population modeling, we perform a blind analysis for the weak-lensing mass calibration by simultaneously modeling the observed count rate eta and the shear profile g(+) of individual clusters through the count-rate-to-mass-and-redshift (eta-M-500-z) relation and the weak-lensing-mass-to-mass-and-redshift (M-WL-M-500-z) relation, respectively, while accounting for the bias in these observables using simulation-based calibrations. As a result, the count-rate-inferred and lensing-calibrated 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(circle dot) less than or similar to M-500 less than or similar to 10(15)h(-1)M(circle dot) with a median of approximate to 10(14)h(-1)M(circle dot) for the eFEDS sample. With the mass calibration, we further model the X-ray observable-to-mass-and-redshift relations, including the rest-frame soft-band and bolometric luminosity (L-X and L-b), the emission-weighted temperature T-X, the mass of intra-cluster 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 X-ray scaling relations all show a mass trend that is statistically consistent with the self-similar prediction at a level of less than or similar to 1.7 sigma. Meanwhile, all these scaling relations show no significant deviation from the self-similarity in their redshift scaling. Moreover, no significant redshift-dependent mass trend is present. This work demonstrates the synergy between the eROSITA and HSC surveys in preparation for the forthcoming first-year eROSITA cluster cosmology.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 0004-6361
• Sprache: Englisch
• DFG: Gefördert durch die Deutsche Forschungsgemeinschaft (DFG) - 450861021