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Galaxy Cluster 1ES 0657-55
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Galaxy Cluster 1ES 0657-55

April 28, 2005
The galaxy cluster 1ES 0657-55 is located in the southern constellation Carina (The Keel), south of the Milky Way band. Its redshift has been measured as z = 0.29. It is a source of strong and very hot X-ray emission and has an asymmetric galaxy distribution, indicating a large mass and recent formation.

Images obtained with the ESO 3.6-m New Technology Telescope (NTT) at La Silla have revealed the presence of an arc , i.e. presumably a background galaxy at larger distance, whose image is strongly distorted by the gravitational field of this cluster.

This photo shows a (false-colour) image of the galaxy cluster 1ES 0657-558 prepared from data taken in the g (green) band filter. The arcs and arclets in this cluster are particularly well visible in this image. The total exposure time was 600 seconds. North is up and East is left.


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