Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-01-23
Astronomy and Astrophysics
Astrophysics
Contribution to IAU Symposium 214 "High Energy Processes and Phenomena in Astrophysics" (6-10 August, 2002; Suzhou, China)
Scientific paper
We discuss two themes from Chandra and XMM-Newton observations of galaxies, groups, and clusters. First, we review observational aspects of cluster formation and evolution as matter accretes along filaments in A85 and A1367. We describe Chandra observations that probe the later evolutionary phases where the effects of mergers -- both subsonic and supersonic -- are observed in cluster cores as ``cold fronts'' and shocks. Second, we review the interactions between the hot, intracluster gas with relativistic plasma originating in active nuclei within the dominant galaxy at the cluster center. As examples of this interaction, we describe the radio and X-ray observations of M87 where buoyantly rising bubbles transfer energy and matter within the cluster core. We describe the Chandra observations of ZW3146 which exhibits both multiple cold fronts and relativistic plasma interactions. Finally, we describe the X-ray observations of NGC4636 where energy produced by the central AGN imprints a unique signature on the surrounding hot corona of the galaxy.
Churazov Eugene
David Liana
Durret Florence
Forman William
Jones Christine
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