The life of central radio galaxies in clusters: AGN-ICM studies of eRASS1 clusters in the ASKAP fields
Authors
Angie Veronica
Thomas H. Reiprich
Florian Pacaud
Marcus Brüggen
Bärbel Koribalski
Thomas Pasini
Tessa Vernstrom
Stefan W. Duchesne
Kathrin Böckmann
Jeremy S. Sanders
Y. Emre Bahar
Fabian Balzer
Lachlan J. Barnes
Esra Bulbul
Nicolas Clerc
Jessica E. M. Craig
Johan Comparat
Simon Dannhauer
Jakob Dietl
Klaus Dolag
Vittorio Ghirardini
Sebastian Grandis
Duy Hoang
Andrew M. Hopkins
Zsofi Igo
Matthias Kluge
Ang Liu
Konstantinos Migkas
Vanessa A. Moss
Miriam E. Ramos-Ceja
Chris Riseley
Lawrence Rudnick
Mara Salvato
Stanislav Shabala
Riccardo Seppi
Jacco van Loon
Tayyaba Zafar
Xiaoyuan Zhang
Abstract
The mechanical feedback from the central AGNs can be crucial for balancing the radiative cooling of the intracluster medium at the cluster centre. We aim to understand the relationship between the power of AGN feedback and the cooling of gas in the centres of galaxy clusters by correlating the radio properties of the brightest cluster galaxies (BCGs) with the X-ray properties of their host clusters. We used catalogues from the first SRG/eROSITA All-Sky Survey (eRASS1) along with ASKAP radio data. In total, we identified 134 radio sources associated with BCGs of the 151 eRASS1 clusters located in the PS1, PS2, and SWAG-X ASKAP fields. Non-detections were treated as upper limits. We correlated BCG radio luminosity, largest linear size (LLS), and BCG offset with the integrated X-ray luminosity of their host clusters. To characterise cool cores (CCs) and non-cool cores (NCCs), we used the concentration parameter $c_{R_{500}}$ and combined it with the BCG offset to assess cluster dynamical state. We analysed the correlation between radio mechanical power and X-ray luminosity within the CC subsample. We observe a potential positive trend between LLS and BCG offset, suggesting an environmental effect on radio-source morphology. We find a weak trend where more luminous central radio galaxies are found in clusters with higher X-ray luminosity. Within the CC subsample, there is a positive but highly scattered relationship between the mechanical luminosity of AGN jets and the X-ray cooling luminosity. This finding is supported by bootstrap resampling and flux-flux analyses. The correlation indicates that AGN feedback is ineffective in high-luminosity (high-mass) clusters. At a cooling luminosity of $L_{\mathrm{X},~r
