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 ( 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 yr −1 . From optical spectroscopy and photometry around the [O ii ] emission line, we estimate that the BCG star formation rate is 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 erg s −1 , which is consistent with the X-ray cooling luminosity ( 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.
Masterson, Megan, et al. "Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448." The Astrophysical Journal, vol. 944, no. 2, Feb. 2023. https://doi.org/10.3847/1538-4357/acae9e
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 (2023). Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448. The Astrophysical Journal, 944(2). https://doi.org/10.3847/1538-4357/acae9e
Masterson, Megan, McDonald, Michael, Ansarinejad, Behzad, et al., "Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448," The Astrophysical Journal 944, no. 2 (2023), https://doi.org/10.3847/1538-4357/acae9e
@article{osti_1961488,
author = {Masterson, Megan and McDonald, Michael and Ansarinejad, Behzad and Bayliss, Matthew and Benson, Bradford A. and Bleem, Lindsey E. and Calzadilla, Michael S. and Edge, Alastair C. and Floyd, Benjamin and Kim, Keunho J. and others},
title = {Evidence for AGN-regulated Cooling in Clusters at z ∼ 1.4: A Multiwavelength View of SPT-CL J0607-4448},
annote = {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 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 × 10 44 erg s −1 , which is consistent with the X-ray cooling luminosity ( L cool = 1.9 − 0.5 + 0.2 × 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. },
doi = {10.3847/1538-4357/acae9e},
url = {https://www.osti.gov/biblio/1961488},
journal = {The Astrophysical Journal},
issn = {ISSN 0004-637X},
number = {2},
volume = {944},
place = {United States},
publisher = {American Astronomical Society},
year = {2023},
month = {02}}
Argonne National Laboratory (ANL), Argonne, IL (United States); Chicago U., Astron. Astrophys. Ctr.; Chicago U., EFI; Chicago U., KICP; Cincinnati U.; Durham U., IPPP; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); MIT, MKI; Melbourne U.; Missouri U., Kansas City; SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
Gordon and Betty Moore Foundation; National Science Foundation (NSF); US Department of Energy; USDOE; USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-06CH11357; AC02-07CH11359
OSTI ID:
1961488
Alternate ID(s):
OSTI ID: 2378029 OSTI ID: 1909868
Report Number(s):
FERMILAB-PUB-23-014-PPD
Journal Information:
The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 944; ISSN 0004-637X