Discovery of a Powerful >10 61 erg AGN Outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300
Here we present ~103 ks of Chandra observations of the galaxy cluster SPT-CLJ0528-5300 (SPT0528, z = 0.768). This cluster harbors the most radio-loud (L 1.4GHz = 1.01 × 1033 erg s -1 Hz -1 ) central active galactic nucleus (AGN) of any cluster in the South Pole Telescope (SPT) Sunyaev–Zeldovich surv...
Published in: | The Astrophysical Journal |
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Main Authors: | , , , , , , , , , , , |
Language: | unknown |
Published: |
2023
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Subjects: | |
Online Access: | http://www.osti.gov/servlets/purl/1592155 https://www.osti.gov/biblio/1592155 https://doi.org/10.3847/2041-8213/ab5b07 |
Summary: | Here we present ~103 ks of Chandra observations of the galaxy cluster SPT-CLJ0528-5300 (SPT0528, z = 0.768). This cluster harbors the most radio-loud (L 1.4GHz = 1.01 × 1033 erg s -1 Hz -1 ) central active galactic nucleus (AGN) of any cluster in the South Pole Telescope (SPT) Sunyaev–Zeldovich survey with available X-ray data. We find evidence of AGN-inflated cavities in the X-ray emission, which are consistent with the orientation of the jet direction revealed by Australia Telescope Compact Array radio data. The combined probability that two such depressions—each at ~1.4–1.8σ significance, oriented ~180° apart and aligned with the jet axis—would occur by chance is 0.1%. At ≳10 61 erg, the outburst in SPT0528 is among the most energetic known in the universe, and certainly the most powerful known at z > 0.25. This work demonstrates that such powerful outbursts can be detected even in shallow X-ray exposures out to relatively high redshifts (z ~ 0.8), providing an avenue for studying the evolution of extreme AGN feedback. The ratio of the cavity power ( P cav = (9.4 ± 5.8) x 104 5 erg s -1 ) to the cooling luminosity (L cool = (1.5 ± 0.5) × 10 44 erg s -1 ) for SPT0528 is among the highest measured to date. If, in the future, additional systems are discovered at similar redshifts with equally high P cav /L cool ratios, it would imply that the feedback/cooling cycle was not as gentle at high redshifts as in the low-redshift universe. |
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