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19th of August 2020
The Brightest Cluster Galaxy in the Phoenix Cluster
by Akahori et al.
The Phoenix galaxy cluster (SPT-CLJ2344-4243) is a very massive cluster, with a mass of 2.5 × 10^15 solar masses, located at the redshift of z=0.6. The Brightest Cluster Galaxy (BCG) near the centre of the cluster possesses an unusually high star-burst rate of 800 solar masses per year. Akahori et al. report the results of an 18 GHz Australia Telescope Compact Array (ATCA) observation of this BCG which they contrast with Chandra X-ray observation. The image above shows the Chandra X-ray surface brightness residuals (after removing the contribution from the active galactic nucleus) in the background colour scale, with the white contours showing the ATCA 18 GHz emission. The Northern and Southern radio structures are aligned with X-ray cavities, suggesting the radio structures are lobes powered by jets launched from the material surrounding the supermassive black hole at the core or the BCG. By assuming that the radio jets/lobes expand with the sound velocity, the authors estimate their ages to be about 10 million years. The paper is published in Publications of the Astronomical Society of Japan.

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