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Title: Discovery of a Powerful >1061 erg AGN outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300

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.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science - Office of High Energy Physics; National Aeronautic and Space Administration (NASA)
OSTI Identifier:
1581140
DOE Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 887; Journal Issue: 1
Country of Publication:
United States
Language:
English

Citation Formats

Calzadilla, Michael S., McDonald, Michael, Bayliss, Matthew, Benson, Bradford A., Bleem, Lindsey E., Brodwin, Mark, Edge, Alastair C., Floyd, Benjamin, Gupta, Nikhel, and Hlavacek-Larrondo, Julie. Discovery of a Powerful >1061 erg AGN outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300. United States: N. p., 2019. Web. doi:10.3847/2041-8213/ab5b07.
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. Discovery of a Powerful >1061 erg AGN outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300. United States. doi:10.3847/2041-8213/ab5b07.
Calzadilla, Michael S., McDonald, Michael, Bayliss, Matthew, Benson, Bradford A., Bleem, Lindsey E., Brodwin, Mark, Edge, Alastair C., Floyd, Benjamin, Gupta, Nikhel, and Hlavacek-Larrondo, Julie. Tue . "Discovery of a Powerful >1061 erg AGN outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300". United States. doi:10.3847/2041-8213/ab5b07.
@article{osti_1581140,
title = {Discovery of a Powerful >1061 erg AGN outburst in the Distant Galaxy Cluster SPT-CLJ0528-5300},
author = {Calzadilla, Michael S. and McDonald, Michael and Bayliss, Matthew and Benson, Bradford A. and Bleem, Lindsey E. and Brodwin, Mark and Edge, Alastair C. and Floyd, Benjamin and Gupta, Nikhel and Hlavacek-Larrondo, Julie},
abstractNote = {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.},
doi = {10.3847/2041-8213/ab5b07},
journal = {Astrophysical Journal Letters},
number = 1,
volume = 887,
place = {United States},
year = {2019},
month = {12}
}

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