Suzaku Snaps Complete X-ray View of a Galaxy Cluster

Suzaku mission is providing new insight into how assemblages of thousands of
galaxies pull themselves together. For the first time,Suzaku has detected
X-ray-emitting gas at a cluster's outskirts, where a billion-year plunge to the
center begins.

http://www.alienskys.com/2009/Suzaku_Snaps_First_Complete_X_ray_View_of_a_Galaxy_Cluster_2612.html