Michael S. Calzadilla
Discovery of a Powerful >1061 erg AGN Outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300
Calzadilla, Michael S.; McDonald, Michael; Bayliss, Matthew; Benson, Bradford A.; Bleem, Lindsey E.; Brodwin, Mark; Edge, Alastair C.; Floyd, Benjamin; Gupta, Nikhel; Hlavacek-Larrondo, Julie; McNamara, Brian R.; Reichardt, Christian L.
Authors
Michael McDonald
Matthew Bayliss
Bradford A. Benson
Lindsey E. Bleem
Mark Brodwin
Professor Alastair Edge alastair.edge@durham.ac.uk
Professor
Benjamin Floyd
Nikhel Gupta
Julie Hlavacek-Larrondo
Brian R. McNamara
Christian L. Reichardt
Abstract
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 gsim1061 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 (${P}_{\mathrm{cav}}=(9.4\pm 5.8)\times {10}^{45}$ erg s−1) to the cooling luminosity (L cool = (1.5 ± 0.5) × 1044 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.
Citation
Calzadilla, M. S., McDonald, M., Bayliss, M., Benson, B. A., Bleem, L. E., Brodwin, M., …Reichardt, C. L. (2019). Discovery of a Powerful >1061 erg AGN Outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300. Astrophysical Journal Letters, 887(1), Article L17. https://doi.org/10.3847/2041-8213/ab5b07
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 23, 2019 |
Online Publication Date | Dec 10, 2019 |
Publication Date | Dec 10, 2019 |
Deposit Date | Jan 22, 2020 |
Publicly Available Date | Jan 22, 2020 |
Journal | Astrophysical Journal |
Print ISSN | 2041-8205 |
Publisher | American Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 887 |
Issue | 1 |
Article Number | L17 |
DOI | https://doi.org/10.3847/2041-8213/ab5b07 |
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Copyright Statement
© 2019. The American Astronomical Society. All rights reserved.
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