Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..330c&link_type=abstract
In: Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 J
Astronomy and Astrophysics
Astronomy
1
Galaxy Clusters
Scientific paper
In the hierarchical model of structure formation discrete sources form from the collapse of initial density enhancements and subsequently grow through gravitational effects. Clusters of galaxies are thought to form at the intersection of large scale filaments and are expected to undergo a number of merger events. These mergers are highly energetic (1063 -- 1064 ergs) and provide significant energy input into the intracluster medium (ICM) through shocks and turbulence which can lead to amplification of magnetic fields and acceleration of relativistic particles thus triggering synchrotron emission in the ICM.
We present results from a low frequency VLA study of the merging cluster Abell 754. Optical and X-ray data reveal that this cluster has undergone a major merger event. The radio data reveal two clear regions of diffuse synchrotron emission one concentrated in the cluster center and the other located on the edge of a bar-like structure found in the X-rays. We discuss the spectral index of the relativistic particles and compare the radio and X-ray emission of Abell 754. Comparing the spatial and spectral distribution of the relativistic particles to the X-ray temperature maps provides additional information on the nature of the complex merger within this cluster.
Clarke Tracy E.
Ensslin Torsten
Kassim Namir
Neumann Dimitri
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