Discovery of a Powerful >10^61 erg AGN Outburst in Distant Galaxy Cluster SPT-CLJ0528-5300. (arXiv:1911.12828v1 [astro-ph.GA])

Discovery of a Powerful >10^61 erg AGN Outburst in Distant Galaxy Cluster SPT-CLJ0528-5300. (arXiv:1911.12828v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Calzadilla_M/0/1/0/all/0/1">Michael S. Calzadilla</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McDonald_M/0/1/0/all/0/1">Michael McDonald</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bayliss_M/0/1/0/all/0/1">Matthew Bayliss</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Benson_B/0/1/0/all/0/1">Bradford A. Benson</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bleem_L/0/1/0/all/0/1">Lindsey E. Bleem</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Brodwin_M/0/1/0/all/0/1">Mark Brodwin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Edge_A/0/1/0/all/0/1">Alastair C. Edge</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Floyd_B/0/1/0/all/0/1">Benjamin Floyd</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gupta_N/0/1/0/all/0/1">Nikhel Gupta</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Hlavacek_Larrondo_J/0/1/0/all/0/1">Julie Hlavacek-Larrondo</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+McNamara_B/0/1/0/all/0/1">Brian R. McNamara</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Reichardt_C/0/1/0/all/0/1">Christian L. Reichardt</a>

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 x 10^33 erg/s/Hz) central AGN of any cluster in the South Pole
Telescope (SPT) SZ 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 ATCA radio data. The combined
probability that two such depressions — each at ~1.4-1.8sigma significance,
oriented ~180 degrees 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 10^45 erg/s) to the cooling
luminosity (L_cool = 1.5+/-0.5 x 10^44 erg/s) 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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