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Science 3 November 2006:
Vol. 314. no. 5800, p. 721
DOI: 10.1126/science.314.5800.721c
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This Week in Science

Clusters of galaxies grow by the infall of surrounding matter through gravitational effects, and peripheral shock waves are thought to be set up as material hits the cluster outskirts. Bagchi et al. (p. 791; see the Perspective by Enßlin) have used the Very Large Array to detect a ring of radio emission around a cluster that may signify such a shock wave. Giant twin radio arcs cup the cluster Abell 3376 and have size and brightness consistent with cosmological shock waves. The giant shock waves may provide sites for the acceleration of cosmic rays and particles associated with the structure-formation process.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)