Evidence for AGN-Regulated Cooling in Clusters at $z\sim 1.4$: A Multi-Wavelength View of SPT-CL J0607-4448

Abstract

We present a multi-wavelength analysis of the galaxy cluster SPT-CL J0607-4448 (SPT0607), which is one of the most distant clusters discovered by the South Pole Telescope (SPT) at $z=1.4010\pm 0.0028$. 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 of ${\dot{M}}_{\mathrm{cool}}=100_{-60}^{+90}{M}_{\odot }$ yr${}^{-1}$. From optical spectroscopy and photometry around the [O II] emission line, we estimate that the BCG star formation rate is SFR${}_{[\mathrm{O}\mathrm{II}]}=1.7_{-0.6}^{+1.0}{M}_{\odot }$ 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 of $P_{\mathrm{cav}}=3.2_{-1.3}^{+2.1}\times 10^{44}$ erg s${}^{-1}$, which is consistent with the X-ray cooling luminosity ($L_{\mathrm{cool}}=1.9_{-0.5}^{+0.2}\times 10^{44}$ erg s${}^{-1}$ within $r_{\mathrm{cool}}=43$ 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 implications for these findings on the evolution of AGN feedback in galaxy clusters.

13 pages, 5 figures, accepted for publication in ApJ

References in corpus (15)

• The NumPy array: a structure for efficient numerical computation
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• Heating Hot Atmospheres with Active Galactic Nuclei
• Galaxy Clusters Discovered via the Sunyaev-Zel'dovich Effect in the 2500-square-degree SPT-SZ survey
• Intracluster Medium Entropy Profiles for a Chandra Archival Sample of Galaxy Clusters
• An Infrared Survey of Brightest Cluster Galaxies. II: Why are Some Brightest Cluster Galaxies Forming Stars?
• Investigating AGN Heating in a Sample of Nearby Clusters
• X-ray cavities in a sample of 83 SPT-selected clusters of galaxies: Tracing the evolution of AGN feedback in clusters of galaxies out to z=1.2
• A uniform metallicity in the outskirts of massive, nearby galaxy clusters
• OVI Observations of Galaxy Clusters: Evidence for Modest Cooling Flows
• Cool Core Bias in Sunyaev-Zel'dovich Galaxy Cluster Surveys
• Evidence of runaway gas cooling in the absence of supermassive black hole feedback at the epoch of cluster formation
• Hiding in Plain Sight - Recovering Clusters of Galaxies with the Strongest AGN in Their Cores
• The History of Metal Enrichment Traced by X-ray Observations of High Redshift Galaxy Clusters
• The Clusters Hiding in Plain Sight (CHiPS) survey: Complete sample of extreme BCG clusters

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