The eROSITA Final Equatorial-Depth Survey (eFEDS). X-ray properties and scaling relations of galaxy clusters and groups. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2022

The eROSITA Final Equatorial-Depth Survey (eFEDS). X-ray properties and scaling relations of galaxy clusters and groups.

Florian Pacaud
Konstantinos Migkas
Thomas Reiprich

Résumé

Context. Scaling relations link the physical properties of clusters at cosmic scales. They are used to probe the evolution of large-scale structure, estimate observables of clusters, and constrain cosmological parameters through cluster counts. Aims. We investigate the scaling relations between X-ray observables of the clusters detected in the eFEDS field using Spectrum-Roentgen-Gamma/eROSITA observations taking into account the selection effects and the distributions of observables with cosmic time. Methods. We extract X-ray observables ( L X , L bol , T , M gas , Y X ) within R 500 for the sample of 542 clusters in the eFEDS field. By applying detection and extent likelihood cuts, we construct a subsample of 265 clusters with a contamination level of <10% (including AGNs and spurious fluctuations) to be used in our scaling relations analysis. The selection function based on the state-of-the-art simulations of the eROSITA sky is fully accounted for in our work. Results. We provide the X-ray observables in the core-included < R 500 and core-excised 0.15 R 500 - R 500 apertures for 542 galaxy clusters and groups detected in the eFEDS field. Additionally, we present our best-fit results for the normalization, slope, redshift evolution, and intrinsic scatter parameters of the X-ray scaling relations between L X - T , L X - M gas , L X - Y X , L bol - T , L bol - M gas , L bol - Y X , and M gas - T . We find that the best-fit slopes significantly deviate from the self-similar model at a >4σ confidence level, but our results are nevertheless in good agreement with the simulations including non-gravitational physics, and the recent results that take into account selection effects. Conclusions. The strong deviations we find from the self-similar scenario indicate that the non-gravitational effects play an important role in shaping the observed physical state of clusters. This work extends the scaling relations to the low-mass, low-luminosity galaxy cluster and group regime using eFEDS observations, demonstrating the ability of eROSITA to measure emission from the intracluster medium out to R 500 with survey-depth exposures and constrain the scaling relations in a wide mass-luminosity-redshift range.
Fichier principal
Vignette du fichier
aa42462-21.pdf (3.36 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03759035 , version 1 (24-08-2022)

Licence

Paternité

Identifiants

Citer

Y. Emre Bahar, Esra Bulbul, Nicolas Clerc, Vittorio Ghirardini, Ang Liu, et al.. The eROSITA Final Equatorial-Depth Survey (eFEDS). X-ray properties and scaling relations of galaxy clusters and groups.. Astronomy and Astrophysics - A&A, 2022, 661, pp.A7. ⟨10.1051/0004-6361/202142462⟩. ⟨hal-03759035⟩
42 Consultations
17 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More