Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448

Masterson, Megan; McDonald, Michael; Ansarinejad, Behzad; Bayliss, Matthew; Benson, Bradford A.; Bleem, Lindsey E.; Calzadilla, Michael S.; Edge, Alastair C.; Floyd, Benjamin; Kim, Keunho J.; Khullar, Gourav; Somboonpanyakul, Taweewat

doi:10.3847/1538-4357/acae9e

Title: Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448

Journal Article · Mon Feb 27 00:00:00 EST 2023 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/acae9e· OSTI ID:1961488

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Abstract We present a multiwavelength analysis of the galaxy cluster SPT-CL J0607-4448 (SPT0607), which is one of the most distant clusters discovered by the South Pole Telescope at z = 1.4010 ± 0.0028. The high-redshift cluster shows clear signs of being relaxed with well-regulated feedback from the active galactic nucleus (AGN) in the brightest cluster galaxy (BCG). Using Chandra X-ray data, we construct thermodynamic profiles and determine the properties of the intracluster medium. The cool-core nature of the cluster is supported by a centrally peaked density profile and low central entropy ( $K_{0} = 18_{- 9}^{+ 11}$ keV cm ² ), which we estimate assuming an isothermal temperature profile due to the limited spectral information given the distance to the cluster. Using the density profile and gas cooling time inferred from the X-ray data, we find a mass-cooling rate ${\dot{M}}_{cool} = 100_{- 60}^{+ 90} M_{⊙}$ yr ⁻¹ . From optical spectroscopy and photometry around the [O ii ] emission line, we estimate that the BCG star formation rate is ${SFR}_{[O II]} = {1.7}_{- 0.6}^{+ 1.0} M_{⊙}$ yr ⁻¹ , roughly two orders of magnitude lower than the predicted mass-cooling rate. In addition, using ATCA radio data at 2.1 GHz, we measure a radio jet power $P_{cav} = {3.2}_{- 1.3}^{+ 2.1} \times 10^{44}$ erg s ⁻¹ , which is consistent with the X-ray cooling luminosity ( $L_{cool} = {1.9}_{- 0.5}^{+ 0.2} \times 10^{44}$ erg s ⁻¹ within r _cool = 43 kpc). These findings suggest that SPT0607 is a relaxed, cool-core cluster with AGN-regulated cooling at an epoch shortly after cluster formation, implying that the balance between cooling and feedback can be reached quickly. We discuss the implications for these findings on the evolution of AGN feedback in galaxy clusters.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Gordon and Betty Moore Foundation; Australian Research Councils Discovery Projects

Grant/Contract Number:: AC02-06CH11357; AC02-07CH11359; PLR-1248097; OPP-1852617; PHY-1125897; GBMF#947; DP200101068

OSTI ID:: 1961488

Alternate ID(s):: OSTI ID: 1909868

Report Number(s):: FERMILAB-PUB-23-014-PPD; arXiv:2301.00830

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Vol. 944 Journal Issue: 2; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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79 ASTRONOMY AND ASTROPHYSICS
brightest cluster galaxies
galaxy clusters
intracluster medium
radio galaxies
high-redshift galaxy clusters

Title: Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448

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