This galaxy cluster has been dubbed the "Phoenix Cluster" because it is located in the constellation of the Phoenix, and because of its remarkable properties, as explained here and in our press release. Stars are forming in the Phoenix Cluster at the highest rate ever observed for the middle of a galaxy cluster. The object is also the most powerful producer of X-rays of any known cluster, and among the most massive of clusters. The data also suggest that the rate of hot gas cooling in the central regions of the cluster is the largest ever observed.
Like other galaxy clusters, Phoenix contains a vast reservoir of hot gas -- containing more normal matter than all of the galaxies in the cluster combined -- that can only be detected with X-ray telescopes like Chandra. This hot gas is giving off copious amounts of X-rays and cooling quickly over time, especially near the center of the cluster, causing gas to flow inwards and form huge numbers of stars.
These features of the central galaxy are shown in the artist's illustration, with hot gas in red, cooler gas as blue, the gas flows shown by the ribbon-like features and the newly formed stars in blue. An animation [link to animation] shows the process of cooling and star formation in action. A close-up of the middle of the optical and UV image [link to optical/UV close-up] shows that the central galaxy has much bluer colors than the nearby galaxies in the cluster, showing the presence of large numbers of hot, massive stars forming.
These results are striking because most galaxy clusters have formed very few stars over the last few billion years. . . .
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