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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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