Markevitch et al. find a supersonic shock in Abell 520. This is the second clear example of such a shock.
Franceschini et al. present the results of Spitzer, Chandra and optical follow-up of the ELIAS-N1 field. Of 122 X-ray sources with fluxes > 1e15 cgs IRAC detects 102. 39% of Chandra sources are type I AGN, 23% type II, the rest show starburst or normal galaxy characteristics although all are AGN.
Kemball & Martinsek investigate bootstrap resampling to assess the fidelity of radio interferometry imaging.
Keywords: clusters, AGN, statistics
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