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Mergers and Non-Thermal Processes in Clusters

Published online by Cambridge University Press:  30 March 2016

Craig L. Sarazin
Craig L. Sarazin*
Affiliation:
Department of Astronomy, University of Virginia, P. O. Box 3818, Charlottesville, VA 22903-0818USA

Abstract

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Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Mergers drive shocks in the intra-cluster gas which heat the intra-cluster gas. Mergers disrupt cluster cooling cores. Mergers produce large, temporary increases in the X-ray luminosities and temperatures of cluster; such merger boost may bias estimates of cosmological parameters from clusters. Chandra observations of the X-ray signatures of mergers, particularly “cold fronts,” will be discussed. X-ray observations of shocks can be used to determine the kinematics of the merger. As a result of particle acceleration in shocks and turbulent acceleration following mergers, clusters of galaxies should contain very large populations of relativistic electrons and ions. Observations and models for the radio, extreme ultraviolet, hard X-ray, and gamma-ray emission from non-thermal particles accelerated in these shocks are described.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 291 - 295
Copyright
Copyright © Astronomical Society of Pacific 2005

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