Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..291s&link_type=abstract
Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July
Astronomy and Astrophysics
Astronomy
Scientific paper
Clusters of galaxies generally form by the gravitational merger of smaller clusters and groups. Major cluster mergers are the most energetic events in the Universe since the Big Bang. Mergers drive shocks in the intracluster gas and these shocks heat the intracluster gas and should also accelerate nonthermal relativistic particles. Chandra and XMM/Newton observations of the X-ray signatures of mergers will be discussed. X-ray observations of shocks can be used to determine the geometry and 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 nonthermal particles accelerated in these shocks will also be described.
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